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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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 - Jan 10 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yano, K., Sakakibara, T., Tayama, T., Yokoyama, M., Amitsuka, H., Homma, Y., Miranović, P., Ichioka, M., Tsutsumi, Y., & Machida, K. (2008). Field-angle-dependent specific heat measurements and gap determination of a heavy fermion superconductor URu2Si2. Physical Review Letters, 100(1), [017004]. https://doi.org/10.1103/PhysRevLett.100.017004