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Unusual Ordering Behavior in Single-Crystal U2Rh3Si5

B. Becker, S. Ramakrishnan, A. A. Menovsky, G. J. Nieuwenhuys, and J. A. Mydosh

  • Kamerlingh Onnes Laboratory, Leiden University, 2300 RA Leiden, The Netherlands

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Phys. Rev. Lett. 78, 1347 – Published 17 February, 1997

DOI: https://doi.org/10.1103/PhysRevLett.78.1347

Abstract

We have grown single crystals of the ternary uranium compound U2Rh3Si5 which crystallizes in a monoclinic Lu2Co3Si5 structure with space group C2/c. U2Rh3Si5 exhibits a single dramatic phase transition at 25.6 K. Here the specific heat peaks to more than 100 J/U-mol K, and the magnetic susceptibility is strongly anisotropic and shows a steplike drop at the ordering temperature. The electrical resistivity is also anisotropic with indications for the appearance of superzone and spin-wave gaps. We relate this behavior to a (weak) first-order phase transition into a simultaneous spin-quadrupolar ordering.

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Phys. Rev. Lett. 78, 1347– Published 17 February, 1997
  • Received 5 November 1996

© 1997 American Physical Society

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