Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)

Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)

The point-contact (PC) d²V/dI²-spectra of HoNi₂B₂C and YNi₂B₂C reveal structure at applied voltages corresponding to the phonon frequencies. At about 4 meV a maximum is observed in the phonon density of states by analogy to the soft-phonon structure in neutron scattering experiments for LuNi₂B₂C [ P...

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Veröffentlicht in:Физика низких температур
Datum:1997
Hauptverfasser: Jansen, A.G.M., Wyder, P., Yanson, I.K., Fisun, V.V., Canfield, P.C., Cho, B.K., Tomy, C.V., McK. Paul, D.
Format: Artikel
Sprache:English
Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 1997
Schlagworte:
Электpонные свойства металлов и сплавов
Online Zugang:https://nasplib.isofts.kiev.ua/handle/123456789/175159
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Zitieren:Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y) / A.G.M. Jansen, P. Wyder, I.K. Yanson , V.V. Fisun, P.C. Canfield, B.K. Cho, C.V. Tomy, D. McK. Paul // Физика низких температур. — 1997. — Т. 23, № 9. — С. 951-964. — Бібліогр.: 40 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
id nasplib_isofts_kiev_ua-123456789-175159
record_format dspace
spelling Jansen, A.G.M.
Wyder, P.
Yanson, I.K.
Fisun, V.V.
Canfield, P.C.
Cho, B.K.
Tomy, C.V.
McK. Paul, D.
2021-01-31T09:18:58Z
2021-01-31T09:18:58Z
1997
Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y) / A.G.M. Jansen, P. Wyder, I.K. Yanson , V.V. Fisun, P.C. Canfield, B.K. Cho, C.V. Tomy, D. McK. Paul // Физика низких температур. — 1997. — Т. 23, № 9. — С. 951-964. — Бібліогр.: 40 назв. — англ.
0132-6414
PACS: 74.70.Ad, 74.25.Kc, 73.40.Jn, 72.10.Di
https://nasplib.isofts.kiev.ua/handle/123456789/175159
The point-contact (PC) d²V/dI²-spectra of HoNi₂B₂C and YNi₂B₂C reveal structure at applied voltages corresponding to the phonon frequencies. At about 4 meV a maximum is observed in the phonon density of states by analogy to the soft-phonon structure in neutron scattering experiments for LuNi₂B₂C [ P. Dervenagas et al., Phys. Rev. B52, R9839 (1995)] and YNi₂B₂C [H. Kawano et al., Cech. J. Phys. 46, S2-825 (1996) Phys. Rev Lett. 77, 4628 (1996)]. In the Ho compound the low-energy phonon peak is suppressed by an applied magnetic field in an anisotropic way, pointing to an interaction between the phonons and the magnetic systems Surprisingly, in the nonmagnetic Y compound the 4-meV peak is also suppressed by a magnetic field. In the Ho-compound contacts which show the «quasi-thermal» behavior, the detailed magnetic-field and temperature dependences of the PC spectra suggest that the magnetic order is destroyed due to the coupled phonon-magnon subsystem which is driven out of equilibrium by electrons that pass through the contact, by analogy with the nonequilibrium phonon-induced destruction of the superconducting state in point contacts [I. K. Yanson et al., JETP Lett 45, 543 (1987)]. The PC electron-phonon interaction (EPI) spectral functions are reconstructed and the estimates for the λ-parameter yield values of the order of 0.1. Comparison with PC EPI spectra of nonsuperconducting and nonmagnetic LaNi₂B₂C [I K. Yanson et al, Phys Rev. Lett. 78, 935 (1997)], as well as the comparative study of PC EPI and Andreev-retlection spectra tor various contacts with superconducting Ho and Y compounds suggest that the low-energy part ot the electron-quasi-particle interaction spectral function is responsible for the Cooper pairing in these materials.
en
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
Физика низких температур
Электpонные свойства металлов и сплавов
Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)
Article
published earlier
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
title Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)
spellingShingle Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)
Jansen, A.G.M.
Wyder, P.
Yanson, I.K.
Fisun, V.V.
Canfield, P.C.
Cho, B.K.
Tomy, C.V.
McK. Paul, D.
Электpонные свойства металлов и сплавов
title_short Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)
title_full Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)
title_fullStr Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)
title_full_unstemmed Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y)
title_sort point-contact-spectroscopy evidence of quasi-particle interactions in rni₂b₂c(r=ho, y)
author Jansen, A.G.M.
Wyder, P.
Yanson, I.K.
Fisun, V.V.
Canfield, P.C.
Cho, B.K.
Tomy, C.V.
McK. Paul, D.
author_facet Jansen, A.G.M.
Wyder, P.
Yanson, I.K.
Fisun, V.V.
Canfield, P.C.
Cho, B.K.
Tomy, C.V.
McK. Paul, D.
topic Электpонные свойства металлов и сплавов
topic_facet Электpонные свойства металлов и сплавов
publishDate 1997
language English
container_title Физика низких температур
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
format Article
description The point-contact (PC) d²V/dI²-spectra of HoNi₂B₂C and YNi₂B₂C reveal structure at applied voltages corresponding to the phonon frequencies. At about 4 meV a maximum is observed in the phonon density of states by analogy to the soft-phonon structure in neutron scattering experiments for LuNi₂B₂C [ P. Dervenagas et al., Phys. Rev. B52, R9839 (1995)] and YNi₂B₂C [H. Kawano et al., Cech. J. Phys. 46, S2-825 (1996) Phys. Rev Lett. 77, 4628 (1996)]. In the Ho compound the low-energy phonon peak is suppressed by an applied magnetic field in an anisotropic way, pointing to an interaction between the phonons and the magnetic systems Surprisingly, in the nonmagnetic Y compound the 4-meV peak is also suppressed by a magnetic field. In the Ho-compound contacts which show the «quasi-thermal» behavior, the detailed magnetic-field and temperature dependences of the PC spectra suggest that the magnetic order is destroyed due to the coupled phonon-magnon subsystem which is driven out of equilibrium by electrons that pass through the contact, by analogy with the nonequilibrium phonon-induced destruction of the superconducting state in point contacts [I. K. Yanson et al., JETP Lett 45, 543 (1987)]. The PC electron-phonon interaction (EPI) spectral functions are reconstructed and the estimates for the λ-parameter yield values of the order of 0.1. Comparison with PC EPI spectra of nonsuperconducting and nonmagnetic LaNi₂B₂C [I K. Yanson et al, Phys Rev. Lett. 78, 935 (1997)], as well as the comparative study of PC EPI and Andreev-retlection spectra tor various contacts with superconducting Ho and Y compounds suggest that the low-energy part ot the electron-quasi-particle interaction spectral function is responsible for the Cooper pairing in these materials.
issn 0132-6414
url https://nasplib.isofts.kiev.ua/handle/123456789/175159
citation_txt Point-contact-spectroscopy evidence of quasi-particle interactions in RNi₂B₂C(R=Ho, Y) / A.G.M. Jansen, P. Wyder, I.K. Yanson , V.V. Fisun, P.C. Canfield, B.K. Cho, C.V. Tomy, D. McK. Paul // Физика низких температур. — 1997. — Т. 23, № 9. — С. 951-964. — Бібліогр.: 40 назв. — англ.
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first_indexed 2025-12-07T17:22:16Z
last_indexed 2025-12-07T17:22:16Z
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