Negative boron isotope effect of a '2Δ' gap peak in Raman spectra from non-magnetic borocarbide superconductors

In Sang Yang; M. V. Klein; S. Bud'ko; P. C. Canfield

doi:10.1016/S0022-3697(02)00240-8

Negative boron isotope effect of a '2Δ' gap peak in Raman spectra from non-magnetic borocarbide superconductors

In Sang Yang, M. V. Klein, S. Bud'ko, P. C. Canfield

Department of Physics

Research output: Contribution to journal › Conference article › peer-review

4 Scopus citations

Abstract

The nickel borocarbides RNi₂B₂C, R = Y or Lu, have a superconducting T_c of 15-16K and exhibit properties consistent with an anisotropic s-wave gap. We briefly review their properties. Electronic Raman scattering results are presented on YNi₂B₂C containing ¹¹B or ¹⁰B. In A_1g and B_1g Raman symmetries, there is no shift in the position of the '2Δ' peak with B-isotope. There is a distinct negative shift, however, in B_2g symmetry. This is interpreted as a negative isotope shift for the gap Δ on that portion of the Fermi surface where the magnitude of the B_2g Raman vertex is large.

Original language	English
Pages (from-to)	2195-2200
Number of pages	6
Journal	Journal of Physics and Chemistry of Solids
Volume	63
Issue number	12
DOIs	https://doi.org/10.1016/S0022-3697(02)00240-8
State	Published - Dec 2002
Event	SNS 2001 - Chicago, IL, United States Duration: 13 May 2001 → 17 May 2002

Bibliographical note

Funding Information:
I-SY was supported by BK21 and KRF-2000-015-DS0014 of Korea and by residual state funds for the Science and Technology Center for Superconductivity at Urbana. The work at Ames Laboratory was funded by the US Department of Energy under Contract No. W-7405-Eng-82.

Keywords

A. Superconductors
D. Phonons

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10.1016/S0022-3697(02)00240-8

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title = "Negative boron isotope effect of a '2Δ' gap peak in Raman spectra from non-magnetic borocarbide superconductors",

abstract = "The nickel borocarbides RNi2B2C, R = Y or Lu, have a superconducting Tc of 15-16K and exhibit properties consistent with an anisotropic s-wave gap. We briefly review their properties. Electronic Raman scattering results are presented on YNi2B2C containing 11B or 10B. In A1g and B1g Raman symmetries, there is no shift in the position of the '2Δ' peak with B-isotope. There is a distinct negative shift, however, in B2g symmetry. This is interpreted as a negative isotope shift for the gap Δ on that portion of the Fermi surface where the magnitude of the B2g Raman vertex is large.",

keywords = "A. Superconductors, D. Phonons",

author = "Yang, {In Sang} and Klein, {M. V.} and S. Bud'ko and Canfield, {P. C.}",

note = "Funding Information: I-SY was supported by BK21 and KRF-2000-015-DS0014 of Korea and by residual state funds for the Science and Technology Center for Superconductivity at Urbana. The work at Ames Laboratory was funded by the US Department of Energy under Contract No. W-7405-Eng-82.; SNS 2001 ; Conference date: 13-05-2001 Through 17-05-2002",

year = "2002",

month = dec,

doi = "10.1016/S0022-3697(02)00240-8",

language = "English",

volume = "63",

pages = "2195--2200",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

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TY - JOUR

T1 - Negative boron isotope effect of a '2Δ' gap peak in Raman spectra from non-magnetic borocarbide superconductors

AU - Yang, In Sang

AU - Klein, M. V.

AU - Bud'ko, S.

AU - Canfield, P. C.

N1 - Funding Information: I-SY was supported by BK21 and KRF-2000-015-DS0014 of Korea and by residual state funds for the Science and Technology Center for Superconductivity at Urbana. The work at Ames Laboratory was funded by the US Department of Energy under Contract No. W-7405-Eng-82.

PY - 2002/12

Y1 - 2002/12

N2 - The nickel borocarbides RNi2B2C, R = Y or Lu, have a superconducting Tc of 15-16K and exhibit properties consistent with an anisotropic s-wave gap. We briefly review their properties. Electronic Raman scattering results are presented on YNi2B2C containing 11B or 10B. In A1g and B1g Raman symmetries, there is no shift in the position of the '2Δ' peak with B-isotope. There is a distinct negative shift, however, in B2g symmetry. This is interpreted as a negative isotope shift for the gap Δ on that portion of the Fermi surface where the magnitude of the B2g Raman vertex is large.

AB - The nickel borocarbides RNi2B2C, R = Y or Lu, have a superconducting Tc of 15-16K and exhibit properties consistent with an anisotropic s-wave gap. We briefly review their properties. Electronic Raman scattering results are presented on YNi2B2C containing 11B or 10B. In A1g and B1g Raman symmetries, there is no shift in the position of the '2Δ' peak with B-isotope. There is a distinct negative shift, however, in B2g symmetry. This is interpreted as a negative isotope shift for the gap Δ on that portion of the Fermi surface where the magnitude of the B2g Raman vertex is large.

KW - A. Superconductors

KW - D. Phonons

UR - http://www.scopus.com/inward/record.url?scp=0036904922&partnerID=8YFLogxK

U2 - 10.1016/S0022-3697(02)00240-8

DO - 10.1016/S0022-3697(02)00240-8

M3 - Conference article

AN - SCOPUS:0036904922

SN - 0022-3697

VL - 63

SP - 2195

EP - 2200

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 12

T2 - SNS 2001

Y2 - 13 May 2001 through 17 May 2002

ER -

Negative boron isotope effect of a '2Δ' gap peak in Raman spectra from non-magnetic borocarbide superconductors

Abstract

Bibliographical note

Keywords

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