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Negative isotope effect of a BCS-like gap; an inelastic light scattering study | | In-Sang Yang
; M.V. Klein
; S. Bud’ko
; P.C. Canfield
; | | Date: |
8 Feb 2002 | | Subject: | Superconductivity | cond-mat.supr-con | | Affiliation: | Ewha Womans University), M.V. Klein (University of Illinois), S. Bud’ko, P.C. Canfield (Iowa State University, Ames Lab. | | Abstract: | In a prior study of the boron isotope effect on the transition temperature ($T_c$) of $R$Ni$_2$B$_2$C ($R$ = Y, Lu) system, a positive isotope effect was observed, e.g., $T_{c}(^{10}B)> T_{c}(^{11}B)$. BCS theory predicts that the superconducting gap at zero temperature ($Delta_0$) is proportional to $T_c$. Therefore, the gap should also show a positive boron isotope effect. On the contrary, in an inelastic light scattering study, we report a negative boron isotope effect on the energy $Omega$ of the gap-like feature in B$_{2g}$ symmetry, e.g., $Omega(^{10}B)< Omega(^{11}B)$. The origin of the effect is discussed in terms of selective probing of a non-conventional electron-phonon interaction on part of the Fermi surface, probably near the X point in the Brillouin zone. | | Source: | arXiv, cond-mat/0202134 | | Services: | Forum | Review | PDF | Favorites | |
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