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


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.


Anisotropy Thermal Conductivity Normal State Electrical Resistivity Magnetic Material 
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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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