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      Evidence for chiral d-wave superconductivity in URu2Si2 from the field-angle variation of its specific heat

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          Abstract

          Low-energy quasiparticle (QP) excitations in the heavy-fermion superconductor URu\(_2\)Si\(_2\) were investigated by specific-heat \(C(T, H, \phi, \theta)\) measurements of a high-quality single crystal. The occurrence of QP excitations due to the Doppler-shift effect was detected regardless of the field direction in \(C(H)\) of the present clean sample, which is in sharp contrast to a previous report. Furthermore, the polar-angle-dependent \(C(\theta)\) measured under a rotating magnetic field within the ac plane exhibits a shoulder-like anomaly at \(\theta \sim 45\) deg and a sharp dip at \(\theta = 90\) deg (\(H \parallel a\)) in the moderate-field region. These features are supported by theoretical analyses based on microscopic calculations assuming the gap symmetry of \(k_z(k_x+ik_y)\), whose gap structure is characterized by a combination of a horizontal line node at the equator and point nodes at the poles. The present results have settled the previous controversy over the gap structure of URu\(_2\)Si\(_2\) and have authenticated its chiral \(d\)-wave superconductivity.

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          Author and article information

          Journal
          2015-11-19
          2016-02-05
          Article
          10.7566/JPSJ.85.033704
          1511.06060
          97d64224-67ef-4653-b7a5-5654f7916dcb

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          J. Phys. Soc. Jpn. 85, 033704 (2016)
          4 pages, 4 figures, published in J. Phys. Soc. Jpn
          cond-mat.supr-con cond-mat.str-el

          Condensed matter
          Condensed matter

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