Orbital symmetry of a triplet pairing in a heavy Fermion superconductor UPt_3

Details Orbital symmetry of a triplet pairing in a heavy Fermion superconductor UPt_3 Orbital symmetry of a triplet pairing in a heavy Fermion superconductor UPt_3

1999-06-08

arxiv.org/abs/cond-mat/9906105v1

Physics

Condensed Matter

Superconductivity

8 pages, 8 eps figures

Scientific paper

10.1016/S0921-4526(99)00809-1

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.

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