Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2

H. Shishido, K. Hashimoto, T. Shibauchi, T. Sasaki, H. Oizumi, N. Kobayashi, T. Takamasu, K. Takehana, Y. Imanaka, T. D. Matsuda, Y. Haga, Y. Onuki, and Y. Matsuda
Phys. Rev. Lett. 102, 156403 – Published 17 April 2009

Abstract

To elucidate the underlying nature of the hidden order (HO) state in heavy-fermion compound URu2Si2, we measure electrical transport properties of ultraclean crystals in a high field, low temperature regime. Unlike previous studies, the present system with much less impurity scattering resolves a distinct anomaly of the Hall resistivity at H*=22.5T, well below the destruction field of the HO phase 36T. In addition, a novel quantum oscillation appears above a magnetic field slightly below H*. These results indicate an abrupt reconstruction of the Fermi surface, which implies a possible phase transition well within the HO phase caused by a band-dependent destruction of the HO parameter.

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  • Received 24 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.156403

©2009 American Physical Society

Authors & Affiliations

H. Shishido1, K. Hashimoto1, T. Shibauchi1, T. Sasaki2, H. Oizumi2, N. Kobayashi2, T. Takamasu3, K. Takehana3, Y. Imanaka3, T. D. Matsuda4, Y. Haga4, Y. Onuki4,5, and Y. Matsuda1

  • 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3National Institute for Material Science, Tsukuba, Ibaraki 305-0047, Japan
  • 4Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Ibaraki, Japan
  • 5Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

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Vol. 102, Iss. 15 — 17 April 2009

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