Lower critical fields of ultraclean URu$_{2}$Si$_{2}$ single crystal

ORAL

Abstract

We study the lower critical fields $H_{c1}$ on extremely clean single crystals of URu$_2$Si$_2$ ($T_c = 1.4$ K) by using a miniature Hall-sensor array magnetometry which can precisely determine the first flux penetration above $H_{c1}$ [1]. For H // $c$, $H_{c1}(T)$ shows highly unusual behavior and is strongly suppressed below 1.2 K with a distinct kink anomaly, while $H_{c1}(T)$ for H // $a$ is well described by the previously proposed multiband nature. We suggest that this anomalous $H_{c1}(T)$ behavior for H // $c$ derives from a peculiar flux penetration through the domain walls in the multicomponent superconductor with broken time reversal symmetry. [1] R. Okazaki et al., arXiv:0909.1075.

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Authors

  • Ryuji Okazaki

    • Department of Physics, Kyoto University

  • Masaaki Shimozawa

    • Department of Physics, Kyoto University

  • Hiroaki Shishido

    • Department of Physics, Kyoto University

  • Takasada Shibauchi

    • Department of Physics, Kyoto University

  • Yuji Matsuda

    • Department of Physics, Kyoto University

  • Marcin Konczykowski

    • Laboratorie des Solides Irradies, CNRS-UMR 7642 and CEA/DSM/DRECAM, Ecole Polytechnique, 91128, Palaiseau, France

  • Yoshinori Haga

    • Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan

  • Tatsuma D. Matsuda

    • Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan

  • Yoshichika Onuki

    • Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan, Graduate School of Science, Osaka University, Toyonaka, Osaka 560

  • Yoichi Yanase

    • Department of Physics, Niigata University, Niigata 950-2181, Japan