Anisotropic Magnetic Response in the Superconducting Mixed State of UPt3

K. Tenya; M. Ikeda; T. Tayama; T. Sakakibara; E. Yamamoto; K. Maezawa; N. Kimura; R. Settai; Y. Ōnuki

doi:10.1103/PhysRevLett.77.3193

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Anisotropic Magnetic Response in the Superconducting Mixed State of UPt3

K. Tenya, M. Ikeda, T. Tayama, T. Sakakibara, E. Yamamoto, K. Maezawa, N. Kimura, R. Settai, Y. Ōnuki

DOI 10.1103/PhysRevLett.77.3193 · Physical Review Letters

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Abstract

Equilibrium magnetization Meq of the superconducting mixed state of UPt3 has been measured as a function of field. At low temperatures, the discontinuity of dMeq/dH at the upper critical field Hc2 exhibits marked anisotropy between the two principal directions of the hexagonal crystal, being indiscernibly small for H⊥c, where the normal state paramagnetic susceptibility is largest. The results are not simply explained by the effective mass anisotropy nor by the ordinary paramagnetic effect of a spin-singlet pairing; they are rather in favor of an odd-parity pairing with an appreciable anisotropy in the pair-spin correlation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.523	Pressure not reported	onset
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.51	Pressure not reported	onset