Line nodes in the superconducting gap function of noncentrosymmetric CePt3Si |
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Authors: | Izawa K Kasahara Y Matsuda Y Behnia K Yasuda T Settai R Onuki Y |
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Affiliation: | Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba, Japan. |
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Abstract: | The superconducting gap structure of recently discovered heavy fermion CePt(3)Si without spatial inversion symmetry was investigated by thermal transport measurements down to 40 mK. In zero field a residual T-linear term was clearly resolved as T --> 0, with a magnitude in good agreement with the value expected for a residual normal fluid with a nodal gap structure, together with a T2 dependence at high temperatures. With an applied magnetic field, the thermal conductivity grows rapidly, in dramatic contrast to fully gapped superconductors, and exhibits one-parameter scaling with T/sqrt[H]. These results place an important constraint on the order parameter symmetry; that is, CePt(3)Si is most likely to have line nodes. |
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