Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry
Temperature dependences of the microwave surface impedance, Zs(T), are measured in the c-axis oriented single-crystal high-Tc superconducting cuprate YBa₂Cu₃O₇₋δ (YBCO) thin films deposited by the off-axis dc magnetron sputtering onto CeO₂-buffered single-crystal sapphire substrates (film thickne...
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| Дата: | 2006 |
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| Автори: | , , , , , |
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| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2006
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| Назва видання: | Физика низких температур |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry / V.M. Pan, O.A. Kalenyuk, O.L. Kasatkin, V.A. Komashko, O.M. Ivanyuta, G.A. Melkov // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 651–660. — Бібліогр.: 50 назв. — англ. |
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irk-123456789-1201992017-06-12T03:05:08Z Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry Pan, V.M. Kalenyuk, O.A. Kasatkin, O.L. Komashko, V.A. Ivanyuta, O.M. Melkov, G.A. Experimental Methods and Applications Temperature dependences of the microwave surface impedance, Zs(T), are measured in the c-axis oriented single-crystal high-Tc superconducting cuprate YBa₂Cu₃O₇₋δ (YBCO) thin films deposited by the off-axis dc magnetron sputtering onto CeO₂-buffered single-crystal sapphire substrates (film thickness is d ≈ 150, 300, 480 nm). Measurements are performed by a use of the coplanar resonator as well as the end-plate cylindrical cavity resonator techniques at a number of several discrete frequencies within the range of 5–134 GHz. The measurements have revealed unexpected peculiarities on the Zs(T)-dependences for the most perfect films under study. The peculiarities appear to be most strongly pronounced on the temperature dependences of the film surface resistance Rs(T) = Re {Zs(T)}. The most important features of the unusual surface resistance behavior are: (i) the temperature dependence Rs(T) of YBCO films under study at low temperatures obeys the exponential law: Rs(T) = Rres + R₀ exp [–∆s/T] with the small energy gap ∆s (∆s 0.5Tc at f = 5 GHz); (ii) the most perfect films reveal a distinct two-peak structure of the Rs(T) dependence with peaks positioned at 27–30 K and 48–51 K, while such peaks are not observed in less perfect films. The peaks are mostly pronounced at moderate (e.g. 34 GHz) frequencies and gradually disappear both at higher and lower frequencies, while their temperature positions remain unchanged. These features of perfect single-crystalline YBCO films are believed to reveal their intrinsic electron properties. Taking into account the possibility of a mixed (s+id)-type pairing symmetry as well as a significant role of extended out-of-plane crystal defects (such as dislocation lines or twin planes) in Bogolyubov’s quasiparticle scattering within the most perfect YBCO films, one can suggest a consistent explanation for the anomalies observed in the Zs(T) behavior. 2006 Article Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry / V.M. Pan, O.A. Kalenyuk, O.L. Kasatkin, V.A. Komashko, O.M. Ivanyuta, G.A. Melkov // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 651–660. — Бібліогр.: 50 назв. — англ. 0132-6414 PACS: 74.25.Nf, 74.72.Bk, 74.78.Bz http://dspace.nbuv.gov.ua/handle/123456789/120199 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Experimental Methods and Applications Experimental Methods and Applications |
| spellingShingle |
Experimental Methods and Applications Experimental Methods and Applications Pan, V.M. Kalenyuk, O.A. Kasatkin, O.L. Komashko, V.A. Ivanyuta, O.M. Melkov, G.A. Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry Физика низких температур |
| description |
Temperature dependences of the microwave surface impedance, Zs(T), are measured in the
c-axis oriented single-crystal high-Tc superconducting cuprate YBa₂Cu₃O₇₋δ (YBCO) thin films
deposited by the off-axis dc magnetron sputtering onto CeO₂-buffered single-crystal sapphire
substrates (film thickness is d ≈ 150, 300, 480 nm). Measurements are performed by a use of the
coplanar resonator as well as the end-plate cylindrical cavity resonator techniques at a number of
several discrete frequencies within the range of 5–134 GHz. The measurements have revealed
unexpected peculiarities on the Zs(T)-dependences for the most perfect films under study. The
peculiarities appear to be most strongly pronounced on the temperature dependences of the film
surface resistance Rs(T) = Re {Zs(T)}. The most important features of the unusual surface
resistance behavior are: (i) the temperature dependence Rs(T) of YBCO films under study at low
temperatures obeys the exponential law: Rs(T) = Rres + R₀ exp [–∆s/T] with the small energy gap
∆s (∆s 0.5Tc at f = 5 GHz); (ii) the most perfect films reveal a distinct two-peak structure of the
Rs(T) dependence with peaks positioned at 27–30 K and 48–51 K, while such peaks are not
observed in less perfect films. The peaks are mostly pronounced at moderate (e.g. 34 GHz)
frequencies and gradually disappear both at higher and lower frequencies, while their temperature
positions remain unchanged. These features of perfect single-crystalline YBCO films are believed
to reveal their intrinsic electron properties. Taking into account the possibility of a mixed
(s+id)-type pairing symmetry as well as a significant role of extended out-of-plane crystal defects
(such as dislocation lines or twin planes) in Bogolyubov’s quasiparticle scattering within the most
perfect YBCO films, one can suggest a consistent explanation for the anomalies observed in the
Zs(T) behavior. |
| format |
Article |
| author |
Pan, V.M. Kalenyuk, O.A. Kasatkin, O.L. Komashko, V.A. Ivanyuta, O.M. Melkov, G.A. |
| author_facet |
Pan, V.M. Kalenyuk, O.A. Kasatkin, O.L. Komashko, V.A. Ivanyuta, O.M. Melkov, G.A. |
| author_sort |
Pan, V.M. |
| title |
Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry |
| title_short |
Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry |
| title_full |
Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry |
| title_fullStr |
Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry |
| title_full_unstemmed |
Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry |
| title_sort |
microwave response of single crystal yba₂cu₃o₇–δ films as a probe for pairing symmetry |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2006 |
| topic_facet |
Experimental Methods and Applications |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/120199 |
| citation_txt |
Microwave response of single crystal YBa₂Cu₃O₇–δ films as a probe for pairing symmetry / V.M. Pan, O.A. Kalenyuk, O.L. Kasatkin, V.A. Komashko, O.M. Ivanyuta, G.A. Melkov // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 651–660. — Бібліогр.: 50 назв. — англ. |
| series |
Физика низких температур |
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