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Orbital symmetry of a triplet pairing in a heavy Fermion superconductor UPt_3 | | Kazushige Machida
; Tsutomu Nishira
; Tetsuo Ohmi
; | | Date: |
8 Jun 1999 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | The orbital symmetry of the superconducting order parameter in UPt_3 is identified by evaluating the directionally dependent thermalconductivity and ultrasound attenuation in the clean limit and compared with the existing data for both basal plane and the c-axis of a hexagonal crystal. The resulting two component orbital part expressed by (lambda_x(k), lambda_y(k)) is combined with the previously determined triplet spin part, leading to clean limit and compared with the existing data for both basal plane and the c-axis of a hexagonal crystal. The resulting two component orbital part expressed by (lambda_x(k), lambda_y(k)) is combined with the previously determined triplet spin part, leading to the order parameter of either the non-unitary bipolar state of the form: d(k) = b lambda_x(k) + i j lambda_y(k) or the unitary planar state of the form: d(k) = b lambda_x(k) + j lambda_y(k) where b perp j = c, or a with the hexagonal unit vectors a, b and c. The d vector is rotatable in the plane spanned by a and c perpendicular to b under weak applied c-axis field because of the weak spin orbit coupling. Experiments are proposed to distinguish between the equally possible these states. | | Source: | arXiv, cond-mat/9906105 | | Services: | Forum | Review | PDF | Favorites | |
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