Field-angle-dependent specific heat measurements and gap determination of a heavy fermion superconductor URu2Si2

K. Yano, T. Sakakibara, T. Tayama, M. Yokoyama, H. Amitsuka, Y. Homma, P. Miranović, M. Ichioka, Y. Tsutsumi, K. Machida

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58 Citations (Scopus)

Abstract

To identify the superconducting gap structure in URu2Si2, we perform field-angle-dependent specific heat measurements for the two principal orientations in addition to field rotations, and a theoretical analysis based on microscopic calculations. The Sommerfeld coefficient γ(H)'s in the mixed state exhibit a distinctly different field dependence. This comes from point nodes and the substantial Pauli paramagnetic effect of URu2Si2. These two features combined give rise to a consistent picture of superconducting properties, including a possible first order transition of Hc2 at low temperatures.

Original languageEnglish
Article number017004
JournalPhysical review letters
Volume100
Issue number1
DOIs
Publication statusPublished - 2008 Jan 10

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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