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

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

2007-12-09

arxiv.org/abs/0712.1376v1

Phys. Rev. Lett. 100, 017004 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.017004

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 theoretical analysis based on microscopic calculations. The Sommerfeld coefficient \gamma(H)'s in the mixed state exhibit distinctively different field-dependence. This comes from point nodes and 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.

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