Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer
The effects of lattice strain on the magnetic and the transport properties of La₀.₈Sr₀.₂MnO₃ films grown on an (001) LaAlO₃ substrate and on a La₀.₈Ca₀.₂MnO₃ layer were studied. It was observed that the metal-insulator and the ferromagnetic transitions occur at higher temperatures for the film depos...
Saved in:
| Published in: | Физика низких температур |
|---|---|
| Date: | 2003 |
| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
| Published: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2003
|
| Subjects: | |
| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/128902 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer / V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, Y.P. Lee J.S. Park // Физика низких температур. — 2003. — Т. 29, № 8. — С. 885-888. — Бібліогр.: 12 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860239144148533248 |
|---|---|
| author | Prokhorov, V.G. Kaminsky, G.G. Komashko, V.A. Lee, J.S. Park, Y.P. |
| author_facet | Prokhorov, V.G. Kaminsky, G.G. Komashko, V.A. Lee, J.S. Park, Y.P. |
| citation_txt | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer / V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, Y.P. Lee J.S. Park // Физика низких температур. — 2003. — Т. 29, № 8. — С. 885-888. — Бібліогр.: 12 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | The effects of lattice strain on the magnetic and the transport properties of La₀.₈Sr₀.₂MnO₃ films grown on an (001) LaAlO₃ substrate and on a La₀.₈Ca₀.₂MnO₃ layer were studied. It was observed that the metal-insulator and the ferromagnetic transitions occur at higher temperatures for the film deposited on La₀.₈Ca₀.₂MnO₃ layer than on LaAlO₃. The dependence of Curie temperature on the bulk and the Jahn-Teller strains were also determined.
|
| first_indexed | 2025-12-07T18:28:12Z |
| format | Article |
| fulltext |
Fizika Nizkikh Temperatur, 2003, v. 29, No. 8, p. 885–888
Magnetic and transport properties
of La Sr MnO0.8 0.2 3/La Ca MnO0.8 0.2 3 bilayer
V.G. Prokhorov, G.G. Kaminsky, and V.A. Komashko
Institute of Metal Physics of the National Academy of Sciences of Ukraine,
36 Vernadsky bul’var, Kiev, 03142, Ukraine
E-mail: pvg@imp.kiev.ua
Y.P. Lee and J.S. Park
Quantum Photonic Science Research Center and Department of Physics,
Hanyang University, Seoul, 133–791 Korea
Received January 21, 2003
The effects of lattice strain on the magnetic and the transport properties of La Sr MnO0.8 0.2 3
films grown on an (001) LaAlO3 substrate and on a La Ca MnO0.8 0.2 3 layer were studied. It was ob-
served that the metal-insulator and the ferromagnetic transitions occur at higher temperatures for
the film deposited on La Ca MnO0.8 0.2 3 layer than on LaAlO3 . The dependence of Curie temperature
on the bulk and the Jahn—Teller strains were also determined.
PACS: 71.30.+h, 75.70.–i
Doped colossal-magnetoresistance (CMR) manga-
nite perovskites exhibit a strong correlation between
their lattice structure and magneto-transport proper-
ties [1]. This phenomenon becomes apparent in thin
films. The lattice strain (and stress) accumulated dur-
ing epitaxial growth of a film plays an important role
in the formation of the spin- and the charge-ordered
states, the metal-insulator transition temperature, and
the value of magnetoresistance [2–4].
The effect of the kind of single-crystal substrate on
the magnetic and the electronic properties of man-
ganite films has been investigated well [5,6]. On the
other hand, to develop hybrid devices based on multi-
layered CMR films detailed information on the mu-
tual influence between constituent layers is required.
It is expected that the magnetic and the transport
properties of a multilayer structure can substantial-
ly differ from those of the individual films of the
constituent layers. In this work we report experi-
mental results for La Sr MnO0.8 0.2 3 (LSM) and
La Ca MnO0.8 0.2 3 (LCM) films and for a
La Sr MnO0.8 0.2 3/La Ca MnO0.8 0.2 3 bilayer (BL).
All films were prepared by rf magnetron sputtering
using a so-called «soft» (or powder) target [7]. The
total pressure in the chamber was 5 10 2� � Torr with a
3:1 Ar–O2 gas mixture. The substrate was a LaAlO3
(001) single crystal (LAO) with an out-of-plane lat-
tice parameter c � 0.379 nm for pseudocubic
symmetry. The substrate temperature during deposi-
tion was 750�C. Both LSM and LCM films were de-
posited with a thickness d � 60 nm, and the BL was
deposited with the same thickness for each layer and
with LSM on top. The �–2� x-ray diffraction (XRD)
patterns were obtained using a Rigaku diffractometer
and CuK� radiation. The lattice parameters evaluated
directly from the XRD data were plotted against
cos sin2 � �/ . A more precise determination of the lat-
tice parameter was obtained extrapolating a straight
line to cos sin2 0� �/ � . The resistance measurements
were carried out using the four-probe method in the
temperature range of 4.2–300 K and a magnetic fields
up to 5 T. The magnetization in a field up to 100 Oe
and the susceptibility at 500 Hz were obtained with a
Quantum Design SQUID magnetometer in the tem-
perature range of 4.2–300 K.
Figure 1,a presents the �–2� XRD scans for LSM
(curve 1), LCM (curve 2) and BL (curve 3) films.
The high intensities of the (00l) peaks show that the
deposition results in highly c-oriented films. Figu-
re 1,b shows that the location of the (002) Bragg peak
for the BL is almost coincident with that for the LCM
film. In contrast, the peak for the LSM film is dis-
© V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, Y.P. Lee, and J.S. Park, 2003
tinctly shifted to a smaller angle. Therefore the analy-
sis of XRD data reveals that the out-of-plane lattice
parameter for the LSM film is strongly dependent on
the substrate: c� 0.398 nm on the LAO substrate and
c � 0.391 nm on the La Ca MnO0.8 0.2 3 film with lat-
tice parameter c � 0.3905 nm.
Figure 2,a displays the temperature dependence of
the resistance R for LSM (curve 1), LCM (curve 2)
and BL (curve 3) films without (filled circles) and
with (open circles) an applied magnetic field of 5 T.
The magnetic field was directed at right angle to both
the film surface and the transport current. The experi-
mental curves show that the metal–insulator (MI)
transition temperatures for both LSM and LCM films
are very close, about 230 K. The BL film undergoes a
MI transition at 280 K, which is higher than for the
individual films. The MI transition temperatures for
all samples are indicated by arrows. The inset in
Fig. 2,a shows that the R(T) behavior of the BL film
differs from that predicted by the simple two paral-
lel-resistor model (solid line), where the first resistor
corresponds to the LSM film (curve 1) and the second
one to the LCM film (curve 2). Since the lattice pa-
rameter c changes significantly only for the LSM film
deposited on the LCM layer, it is reasonable to inter
that the increase in the MI transition temperature for
BL is due to the improved magnetic and electronic
properties of the LSM film only.
Figure 2,b presents the temperature-dependent mag-
netoresistance, MR(%) [ ( ) ( )] ( )� �R R H /R H0 100 ,
obtained for LSM (curve 1), LCM (curve 2) and BL
(curve 3) film in an applied magnetic field of 5 T.
Here, R( )0 and R H( ) are the resistances without and
with a magnetic field. It is seen that a slight enhance-
ment in the MR for BL, with respect to the individual
LSM and LCM films, is observed only at high tempe-
ratures. In the low-temperature range the MR of BL
remains smaller than that of the LSM film and mimics
the MR(T) behavior for the LCM film.
Figure 3,a shows both field-cooled (FC) and ze-
ro-field-cooled (ZFC) temperature-dependent magne-
tization curves for LSM (curve 1), LCM (curve 2)
and BL (curve 3) films. The arrows show the corre-
sponding Curie temperatures. The LCM film mani-
886 Fizika Nizkikh Temperatur, 2003, v. 29, No. 8
V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, Y.P. Lee, and J.S. Park
3
2 2
31
1
0
45 46 47 48
2 � , deg
In
te
n
si
ty
,
1
0
cp
s
4
In
te
n
si
ty
, c
p
s
(002)
LA
O
b
2 � , deg
20 40 60 80
10
10
F FSF S
(0
01
)
(0
0
2
)
(0
0
3
)
S
1
2
3
a
10
10
2
3
4
5
Fig. 1. �–2� XRD patterns of LSM (1), LCM (2) and BL
(3) films (a). The (002) XRD peaks (b).
1.0
0.5
200 300
5
4
3
2
1
BL
B
L
ca
lc
T, K
R
,
1
02
W
R
e
si
st
a
n
ce
,
1
0
�
3
LCM
LSM
1
1 2
2
3
3
BL
a
10
10
10
1
2
3
1
2
3
b
M
a
g
n
e
to
re
si
st
a
n
ce
,
%
100 200 300
T, K
0
0
Fig. 2. Temperature dependence of the resistance for LSM
(1), LCM (2) and BL (3) films without (filled circles)
and with (open circles) an applied magnetic field of 5 T.
The lines are visual aids. Inset: The experimental (circles)
and computed (solid line) dependences R T( ) for the BL
film. The arrows show the MI transition temperatures for
different samples (a). Temperature dependence of the mag-
netoresistance for LSM (1), LCM (2) and BL (3) films.
The lines are visual aids (b).
fests a sharp transition to the ferromagnetic state at
TC � 230 K, in agreement with the published results
for as-grown films [3]. In contrast, the LSM film
displays a broad and smooth magnetic transition near
TC � 260 K. Moreover, the absolute value of the satu-
rated FC magnetization is half of that for the LCM
film of similar thickness. The same behavior of
M T( ) and a lower value of TC with respect to the
bulk value have been observed previously for a
La Sr MnO0.67 0.33 3 film deposited on a LAO substrate
[8,9]. It was explained by the 3-dimensional strain
states in the film, governed by the epitaxial mode of
film growth. The temperature-dependent magnetiza-
tion for BL is significantly different from that pre-
dicted by simply adding the M T( ) values for both
individual LSM and LCM films. The dashed line
in Fig. 3,a shows the predicted curve: M TBL( ) �
� �M T M TLCM LSM( ) ( ), where M TLCM( ) and
M TLSM( ) are the magnetizations for the LCM and
the LSM films, respectively. Since the thicknesses of
the individual films are similar to those of the corre-
sponding layers in BL, the added curve fits the experi-
mental data fourty well at low temperatures (in the
saturation magnetization range). However, the ferro-
magnetic transition of the BL film occurs at a higher
temperature (TC � 280 K) than predicted. This result
confirms that a significant change occurs in the mag-
netic properties of the LSM film deposited on LCM
with respect to that on LAO.
This conclusion is supported by the temperature
dependences of susceptibility for LSM (curve 1),
LCM (curve 2) and BL (curve 3) films in Fig. 3,b.
Since the low-temperature susceptibility peak for BL
(curve 3) mimics that of the individual LCM film, it
can be concluded that the second peak belongs to the
LSM layer in the BL. It is evident that the magnetic
transition of the LSM film deposited on LCM becomes
sharper and the saturated magnetization is achieved at
a higher temperature than for a bare LSM film (see
curve 1).
Let us consider the possible mechanisms of en-
hanced magnetic and transport properties of the LSM
film on LCM with respect to that on LAO. The afore-
mentioned analysis of x-ray data showed that the
out-of-plane lattice parameter c is larger for LSM/LAO.
It is well known that LSM thin films grown on LAO
substrates exhibit an out-of-plane uniaxial tensile
strain and, correspondingly, an in-plane biaxial com-
pression [9,10]. Assuming that the film is strained
from the ideal bulk structure and that the structure is
a single perovskite, the in-plane lattice parameter of
film can be estimated from the unit cell volume in the
bulk. The bulk La Sr MnO0.8 0.2 3 compound has a
rhombohedral pseudocubic symmetry (R c3 ) with
hexagonal lattice parameters of ah � 0.5517 nm and
ch � 1.3359 nm [11]. They are equivalent to cubic lat-
tice parameters of a� b � c � 0.3871 nm and to unit
cell volume V � 0.058 nm3. Therefore, the in-plane
lattice parameter for our LSM/LAO is V/c� a �
� 0.3828 nm, which is almost identical to the value
obtained for an epitaxial La Sr MnO0.67 0.33 3 thin film
[1]. For our LSM/LCM the in-plane lattice parame-
ter is larger and equals a� 0.3852 nm. This difference
between film and bulk lattice parameters leads to
the formation of the above-mentioned in-plane biaxial
Magnetic and transport properties of La Sr MnO08 0.2 3/La Ca MnO0.8 0.2 3 bilayer
Fizika Nizkikh Temperatur, 2003, v. 29, No. 8 887
4
4
3
3
2
2
1
1
0
0 50 100 150
a
LC
M
LS
M
FC
ZFC
B
L
1
1
2
1
2
2
3
3
3
M
a
g
n
e
tiz
a
tio
n
,
1
0
e
m
u
4
200 250 300
T, K
b
S
u
sc
e
p
tib
ili
ty
, 1
0
e
m
u
6
5
Fig. 3. Temperature dependence of the FC and the ZFC
magnetization for LSM (1), LCM (2) and BL (3) films.
The lines are visual aids. The arrows indicate the magnetic
transition temperatures for different samples. The dashed
line was obtained by simple addition of the FC M T( ) cur-
ves (1) and (2) (a). Temperature dependence of the sus-
ceptibility for LSM (1), LCM (2) and BL (3) films. The
lines are visual aids (b).
compressive strain, 100 � �( )a a /afilm bulk bulk , and
the out-of-plane uniaxial tensile strain, 001 � �(cfilm
� c /cbulk bulk) . The calculations performed show that
100 � –1.37% and 001 � 2.8 % for the LSM/LAO
and –0.49% and 1%, respectively, for the LSM/LCM.
For weaker strains and cubic symmetry the Curie point
can be expressed as, according to Millis model [12],
T TC C B JT( ) ( ) � � � � �
�
�
�
�0 1
1
2
2� ,
where B � �( )2 100 001 is the bulk strain, JT �
� �2 3 001 100/ ( ) is the Jahn—Teller strain, � �
� ( )( )1/T dT /dC C B , and � � ( )( )1 2 2/T d T /dC C JT .
For the last two quantities we are took the values
from Ref. 12, i.e. � � 10 and � � 1000. Using this
equation and the values obtained for 100 and 001
in our LSM film and layer we calculated the change
in Curie temperature T /T
C C/ /LSM LCM LSM LAO
calc calc � 1.07,
which is an excellent agreement with our experimen-
tal result T /TC C/ /LSM LCM LSM LAO
� 1.077. This con-
firms the strong correlation between crystal lattice
distortion and the electronic and magnetic states in
CMR materials.
In summary, the magnetic and the transport pro-
perties of La Sr MnO0.8 0.2 3 films grown on an (001)
LaAlO3 substrate and on a La Ca MnO0.8 0.2 3 layer
were studied. It was shown that the metal-insulator
and the ferromagnetic transitions occur at higher tem-
peratures for the film deposited on La Ca MnO0.8 0.2 3
layer than on LaAlO3 . The enhanced magne-
toresistance and ferromagnetic ordering in the
La Sr MnO0.8 0.2 3/La Ca MnO0.8 0.2 3 bilayer can be
explained by lattice strain relaxation in the
La Sr MnO0.8 0.2 3 film.
This work was funded by the KOSEF through the
Quantum Photonic Science Research Center.
1. F. Tsui, M.C. Smoak, T.K. Nath, and C. B. Eom,
Appl. Phys. Lett. 76, 2421 (2000).
2. R.A. Rao, D. Lavric, T.K. Nath, C.B. Eom, L. Wu,
and F. Tsui, Appl. Phys. Lett. 73, 3294 (1998).
3. S. Jacob, T. Roch, F.S. Razavi, G.M. Gross, and H.-U.
Habermeier, J. Appl. Phys. 91, 2232 (2002).
4. A. Biswas, M. Rajeswari, R.C. Srivastava, T. Venka-
tesan, R.L. Green, Q. Lu, A.L. de Lozanne, and A.J.
Millis, Phys. Rev. B63, 184424 (2001).
5. O.I. Lebedev, G. Van Tendeloo, S. Amelinckx, H.L.
Ju, and K.M. Krishnan, Philos. Mag. 80, 673 (2000).
6. J.R. Sun, C.F. Yeung, K. Zhou, L.Z. Zhou, C.H.
Leung, H.K. Wong, and B.G. Shen, Appl. Phys. Lett.
76, 1164 (2000).
7. V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, J.S.
Park, and Y.P. Lee, J. Appl. Phys. 90, 1055 (2001).
8. T.K. Nath, R.A. Rao, D. Lavric, C.B. Eom, L. Wu,
and F. Tsui, Appl. Phys. Lett. 74, 1615 (1999).
9. A.M. Haghiri-Gosnet, J. Wolfman, B. Mercey, Ch. Si-
mon, P. Lecoeur, M. Korzenski, M. Hervieu, R. Des-
feux, and G. Baldinozzi, J. Appl. Phys. 88, 4257 (2000).
10. Y.H. Li, K.A. Thomas, P.S.I.P.N. de Silva, L.F.
Cohen, A. Goyal, M. Rajeswari, N.D. Mathur, M.G.
Blamire, J.E. Evetts, T. Venkatesan, and J.L.
MacManus-Driscoll, J. Mater. Res. 13, 2161 (1998).
11. J.F. Mitchell, D.N. Argyriou, C.D. Potter, D.G.
Hinks, J.D. Jorgensen, and S.D. Bader, Phys. Rev.
B54, 6172 (1996).
12. A.J. Millis, T. Darling, and A. Migliori, J. Appl.
Phys. 83, 1588 (1998).
888 Fizika Nizkikh Temperatur, 2003, v. 29, No. 8
V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, Y.P. Lee, and J.S. Park
|
| id | nasplib_isofts_kiev_ua-123456789-128902 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T18:28:12Z |
| publishDate | 2003 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Prokhorov, V.G. Kaminsky, G.G. Komashko, V.A. Lee, J.S. Park, Y.P. 2018-01-14T12:18:24Z 2018-01-14T12:18:24Z 2003 Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer / V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, Y.P. Lee J.S. Park // Физика низких температур. — 2003. — Т. 29, № 8. — С. 885-888. — Бібліогр.: 12 назв. — англ. 0132-6414 PACS: 71.30.+h, 75.70.-i https://nasplib.isofts.kiev.ua/handle/123456789/128902 The effects of lattice strain on the magnetic and the transport properties of La₀.₈Sr₀.₂MnO₃ films grown on an (001) LaAlO₃ substrate and on a La₀.₈Ca₀.₂MnO₃ layer were studied. It was observed that the metal-insulator and the ferromagnetic transitions occur at higher temperatures for the film deposited on La₀.₈Ca₀.₂MnO₃ layer than on LaAlO₃. The dependence of Curie temperature on the bulk and the Jahn-Teller strains were also determined. This work was funded by the KOSEF through the Quantum Photonic Science Research Center. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Низкотемпеpатуpный магнетизм Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer Article published earlier |
| spellingShingle | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer Prokhorov, V.G. Kaminsky, G.G. Komashko, V.A. Lee, J.S. Park, Y.P. Низкотемпеpатуpный магнетизм |
| title | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer |
| title_full | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer |
| title_fullStr | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer |
| title_full_unstemmed | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer |
| title_short | Magnetic and transport properties of La₀.₈Sr₀.₂MnO₃/La₀.₈Ca₀.₂MnO₃ bilayer |
| title_sort | magnetic and transport properties of la₀.₈sr₀.₂mno₃/la₀.₈ca₀.₂mno₃ bilayer |
| topic | Низкотемпеpатуpный магнетизм |
| topic_facet | Низкотемпеpатуpный магнетизм |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/128902 |
| work_keys_str_mv | AT prokhorovvg magneticandtransportpropertiesofla08sr02mno3la08ca02mno3bilayer AT kaminskygg magneticandtransportpropertiesofla08sr02mno3la08ca02mno3bilayer AT komashkova magneticandtransportpropertiesofla08sr02mno3la08ca02mno3bilayer AT leejs magneticandtransportpropertiesofla08sr02mno3la08ca02mno3bilayer AT parkyp magneticandtransportpropertiesofla08sr02mno3la08ca02mno3bilayer |