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Journal of Low Temperature Physics

, Volume 85, Issue 5–6, pp 359–376 | Cite as

Anisotropy of the upper critical field near Tc and the properties of URu2Si2 and UBe13 in the normal state

  • F. G. Aliev
  • V. Kovachik
  • V. V. Moshchalkov
  • V. V. Pryadun
  • N. E. Alekseevskii
  • A. V. Mitin
  • N. Agrait
  • S. Vieira
  • R. Villar
Article

Abstract

Simultaneous measurements of the electrical resistivity ρ Seebeck coefficientS, and thermal conductivity k of URu2Si2 and UBe13 are carried out. For URu2Si2 a strong anomaly in the k(T) dependence near the temperature of the antiferromagnetic transition was observed. The thermal conductivity of UBe13 exhibits only a small (about 30%) change of the derivativedk/dT near 8–9 K, which may be related to an increase of the characteristic length of antiferromagnetic correlations below this temperature. Studying STM spectra in the normal and magnetic phase of a URu2Si2 single crystal we observed that the magnetic gap, partially opened at the Fermi surface below the Néel temperature,T N =17.5 K, is strongly anisotropic: gapped states mainly correspond to the tetragonalab-plane. Anisotropy of the upper critical field nearT c (H<4kOe), studied for URu2Si2 and UBe13 single crystals, was found to be in a good correspondence with the character of the antiferromagnetic transition.

Keywords

Anisotropy Thermal Conductivity Normal State Electrical Resistivity Magnetic Material 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Corporation 1991

Authors and Affiliations

  • F. G. Aliev
    • 1
  • V. Kovachik
    • 1
  • V. V. Moshchalkov
    • 1
  • V. V. Pryadun
    • 1
  • N. E. Alekseevskii
    • 2
  • A. V. Mitin
    • 2
  • N. Agrait
    • 3
  • S. Vieira
    • 3
  • R. Villar
    • 3
  1. 1.Laboratory of High-Tc Superconductivity, Department of PhysicsMoscow State UniversityMoscowUSSR
  2. 2.Institute for Physical ProblemsMoscowUSSR
  3. 3.Dpto. de Fisica de la Materia CondensadaUniversidad Autonoma de MadridMadridSpain

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