Study of the electron-phonon interaction in metal diborides MeB2 (Me = Zr, Nb, Ta, Mg) by point-contact spectroscopy

I. K. Yanson; Yu G. Naidyuk; O. E. Kvitnitskaya; V. V. Fisun; N. L. Bobrov; P. N. Chubov; V. V. Ryabovol; G. Behr; W. N. Kang; E. M. Choi; H. J. Kim; S. I. Lee; T. Aizawa; S. Otani; S. L. Drechsler

doi:10.1142/s0217984903005688

Study of the electron-phonon interaction in metal diborides MeB₂ (Me = Zr, Nb, Ta, Mg) by point-contact spectroscopy

I. K. Yanson, Yu G. Naidyuk, O. E. Kvitnitskaya, V. V. Fisun, N. L. Bobrov, P. N. Chubov, V. V. Ryabovol, G. Behr, W. N. Kang, E. M. Choi, H. J. Kim, S. I. Lee, T. Aizawa, S. Otani, S. L. Drechsler

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Abstract

We review investigations of the electron-phonon interaction (EPI) in metal diborides MeB₂ (Me = Zr, Nb, Ta, Mg) by point-contact (PC) spectroscopy. For transition metal compounds the PC EPI functions were recovered and EPI parameter λ ≲ 0.1 were estimated. The data are consistent with the measured surface phonon dispersion curves. The low λ value questions some reports about superconductivity in these compounds. Contrary, EPI in superconducting MgB₂ films manifests also in the PC spectra itself by virtue of an elastic EPI contribution to the excess current determined by the energy dependence of the superconducting order parameter. To analyse the phonon features in the PC spectra of MgB₂ a two-band model is exploited and the proximity effect in the k-space is suggested.

Original language	English
Pages (from-to)	657-666
Number of pages	10
Journal	Modern Physics Letters B
Volume	17
Issue number	10-12
DOIs	https://doi.org/10.1142/s0217984903005688
State	Published - 20 May 2003
Externally published	Yes

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Yanson, I. K., Naidyuk, Y. G., Kvitnitskaya, O. E., Fisun, V. V., Bobrov, N. L., Chubov, P. N., Ryabovol, V. V., Behr, G., Kang, W. N., Choi, E. M., Kim, H. J., Lee, S. I., Aizawa, T., Otani, S., & Drechsler, S. L. (2003). Study of the electron-phonon interaction in metal diborides MeB₂ (Me = Zr, Nb, Ta, Mg) by point-contact spectroscopy. Modern Physics Letters B, 17(10-12), 657-666. https://doi.org/10.1142/s0217984903005688

@article{6de6788f308e4dfabaa6e5394595a231,

title = "Study of the electron-phonon interaction in metal diborides MeB2 (Me = Zr, Nb, Ta, Mg) by point-contact spectroscopy",

abstract = "We review investigations of the electron-phonon interaction (EPI) in metal diborides MeB2 (Me = Zr, Nb, Ta, Mg) by point-contact (PC) spectroscopy. For transition metal compounds the PC EPI functions were recovered and EPI parameter λ ≲ 0.1 were estimated. The data are consistent with the measured surface phonon dispersion curves. The low λ value questions some reports about superconductivity in these compounds. Contrary, EPI in superconducting MgB2 films manifests also in the PC spectra itself by virtue of an elastic EPI contribution to the excess current determined by the energy dependence of the superconducting order parameter. To analyse the phonon features in the PC spectra of MgB2 a two-band model is exploited and the proximity effect in the k-space is suggested.",

author = "Yanson, \{I. K.\} and Naidyuk, \{Yu G.\} and Kvitnitskaya, \{O. E.\} and Fisun, \{V. V.\} and Bobrov, \{N. L.\} and Chubov, \{P. N.\} and Ryabovol, \{V. V.\} and G. Behr and Kang, \{W. N.\} and Choi, \{E. M.\} and Kim, \{H. J.\} and Lee, \{S. I.\} and T. Aizawa and S. Otani and Drechsler, \{S. L.\}",

year = "2003",

month = may,

day = "20",

doi = "10.1142/s0217984903005688",

language = "English",

volume = "17",

pages = "657--666",

journal = "Modern Physics Letters B",

issn = "0217-9849",

publisher = "World Scientific",

number = "10-12",

}

Yanson, IK, Naidyuk, YG, Kvitnitskaya, OE, Fisun, VV, Bobrov, NL, Chubov, PN, Ryabovol, VV, Behr, G, Kang, WN, Choi, EM, Kim, HJ, Lee, SI, Aizawa, T, Otani, S & Drechsler, SL 2003, 'Study of the electron-phonon interaction in metal diborides MeB₂ (Me = Zr, Nb, Ta, Mg) by point-contact spectroscopy', Modern Physics Letters B, vol. 17, no. 10-12, pp. 657-666. https://doi.org/10.1142/s0217984903005688

TY - JOUR

T1 - Study of the electron-phonon interaction in metal diborides MeB2 (Me = Zr, Nb, Ta, Mg) by point-contact spectroscopy

AU - Yanson, I. K.

AU - Naidyuk, Yu G.

AU - Kvitnitskaya, O. E.

AU - Fisun, V. V.

AU - Bobrov, N. L.

AU - Chubov, P. N.

AU - Ryabovol, V. V.

AU - Behr, G.

AU - Kang, W. N.

AU - Choi, E. M.

AU - Kim, H. J.

AU - Lee, S. I.

AU - Aizawa, T.

AU - Otani, S.

AU - Drechsler, S. L.

PY - 2003/5/20

Y1 - 2003/5/20

N2 - We review investigations of the electron-phonon interaction (EPI) in metal diborides MeB2 (Me = Zr, Nb, Ta, Mg) by point-contact (PC) spectroscopy. For transition metal compounds the PC EPI functions were recovered and EPI parameter λ ≲ 0.1 were estimated. The data are consistent with the measured surface phonon dispersion curves. The low λ value questions some reports about superconductivity in these compounds. Contrary, EPI in superconducting MgB2 films manifests also in the PC spectra itself by virtue of an elastic EPI contribution to the excess current determined by the energy dependence of the superconducting order parameter. To analyse the phonon features in the PC spectra of MgB2 a two-band model is exploited and the proximity effect in the k-space is suggested.

AB - We review investigations of the electron-phonon interaction (EPI) in metal diborides MeB2 (Me = Zr, Nb, Ta, Mg) by point-contact (PC) spectroscopy. For transition metal compounds the PC EPI functions were recovered and EPI parameter λ ≲ 0.1 were estimated. The data are consistent with the measured surface phonon dispersion curves. The low λ value questions some reports about superconductivity in these compounds. Contrary, EPI in superconducting MgB2 films manifests also in the PC spectra itself by virtue of an elastic EPI contribution to the excess current determined by the energy dependence of the superconducting order parameter. To analyse the phonon features in the PC spectra of MgB2 a two-band model is exploited and the proximity effect in the k-space is suggested.

UR - https://www.scopus.com/pages/publications/0042672822

U2 - 10.1142/s0217984903005688

DO - 10.1142/s0217984903005688

M3 - Article

AN - SCOPUS:0042672822

SN - 0217-9849

VL - 17

SP - 657

EP - 666

JO - Modern Physics Letters B

JF - Modern Physics Letters B

IS - 10-12

ER -

Study of the electron-phonon interaction in metal diborides MeB₂ (Me = Zr, Nb, Ta, Mg) by point-contact spectroscopy

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