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Anisotropic electronic and magnetic properties of the quasi-two-dimensional heavy-fermion antiferromagnet CeRhIn5

Identifieur interne : 011A25 ( Main/Repository ); précédent : 011A24; suivant : 011A26

Anisotropic electronic and magnetic properties of the quasi-two-dimensional heavy-fermion antiferromagnet CeRhIn5

Auteurs : RBID : Pascal:00-0528268

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Abstract

We have used high pulsed magnetic fields to 50 T to observe de Haas-van Alphen oscillations in the tetragonal antiferromagnet CeRhIn5, which has an enhanced value of the electronic specific heat coefficient γ420 mJ/mol K2. For TN, the specific heat data at zero applied magnetic field are consistent with the existence of an anisotropic spin-density wave opening a gap in the Fermi surface. The low-temperature magnetization reveals a magnetic phase transition that appears to be first order in nature. Quantum oscillations, which are observed for TN when B∥[100] and B∥[001], reveal an anisotropic Fermi surface. The temperature dependence of the amplitudes of the quantum oscillations shows anomalous behavior for B∥[001] as a maximum at T*≃1.2 K is observed which we attribute to a gap opening in the anisotropic Fermi surface. The electronic and magnetic properties are anisotropic due to the quasi-two-dimensional crystal structure.

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<div type="abstract" xml:lang="en">We have used high pulsed magnetic fields to 50 T to observe de Haas-van Alphen oscillations in the tetragonal antiferromagnet CeRhIn
<sub>5</sub>
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<sup>2</sup>
. For T<sub>N</sub>
, the specific heat data at zero applied magnetic field are consistent with the existence of an anisotropic spin-density wave opening a gap in the Fermi surface. The low-temperature magnetization reveals a magnetic phase transition that appears to be first order in nature. Quantum oscillations, which are observed for T<sub>N</sub>
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<sup>2</sup>
. For T<sub>N</sub>
, the specific heat data at zero applied magnetic field are consistent with the existence of an anisotropic spin-density wave opening a gap in the Fermi surface. The low-temperature magnetization reveals a magnetic phase transition that appears to be first order in nature. Quantum oscillations, which are observed for T<sub>N</sub>
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