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Specific heat of (Y,Lu)Ni2B2C in the mixed state | | D. Lipp
; M. Schneider
; A. Gladun
; S.-L. Drechsler
; J. Freudenberger
; G. Fuchs
; K. Nenkov
; K.-H. Mueller
; T. Cichorek
; P. Gegenwart
; | | Date: |
4 Oct 2000 | | Subject: | cond-mat | | Abstract: | The temperature and magnetic field dependences of the electronic specific heat in the superconducting mixed state as well as the upper critical field have been measured on a (Y,Lu)Ni2B2C series to study the influence of disorder. The electronic specific heat in the vortex state shows deviations from the usual gamma(H) proportional to H-law for conventional superconductors for all samples resulting in a disorder dependent negative curvature of gamma proportional to H sup(1-beta). For samples with disorder at the R site beta and the positive curvature exponent alpha of H sub(c2) are reduced but alpha, beta remain always positive, as distinct from much stronger disorder due to Pt substions at the Ni site where alpha, beta rapidly tend to 0. Alpha shows a minimum at equal Y and Lu concentration. H sub(c2)(00, T sub(c), the curvatures of H sub(c2) and gamma(h), as well as the normal state Sommerfeld constant gamma sub(N) are reduced similarly. | | Source: | arXiv, cond-mat/0010066 | | Services: | Forum | Review | PDF | Favorites | |
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