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Anomalous field-angle dependence of the specific heat of heavy-fermion superconductor UPt$$_3$$

Kittaka, Shunichiro*; An, Koji*; Sakakibara, Toshiro*; Haga, Yoshinori ; Yamamoto, Etsuji ; Kimura, Noriaki*; Onuki, Yoshichika; Machida, Kazushige*

The field-angle variation of the specific heat of the heavy-fermion superconductor UPt$$_3$$ at low temperatures down to 50 mK was investigated. The data show that the unusual upper critical field becomes marked only when the magnetic field is pointed close to the $$c$$-axis. However, the attempt to observe the superconducting gap structure through field-angle dependence of the specific heat failed, because of the small anisotropy compared to the experimental accuracy of 0.5%. It implies that the field-induced excitation of the heavy quasiparticles occur isotropically with respect to the angle.

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Category:Physics, Multidisciplinary

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