Magnetic Field Driven Electronic Singularities through Metamagnetic Phenomena: Case of the Heavy Fermion Antiferromagnet Ce(Ru

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概要

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• Thermoelectric power measurements on the heavy fermion antiferromagnet Ce(Ru<inf>0.92</inf>Rh<inf>0.08</inf>)<inf>2</inf>Si<inf>2</inf>under magnetic field (H) show clearly that the antiferromagnetic state below the critical field H_{\text{c}}\sim 2.8 T can be fully decoupled from the pseudo-metamagnetic crossover at H_{\text{m}}\sim 5.8 T which occurs when the magnetization reaches a critical value. By contrast to the weak field variation of the Sommerfeld coefficient of the specific heat in the field window from H_{\text{c}} to H_{\text{m}}, two electronic singularities with opposite signs are detected in the thermoelectric power. The interplay between the magnetic instability and the topological change of the Fermi surface is discussed and we argue similarities to other field instabilities in various heavy fermion compounds.

• 2013-05-15

著者

• Izawa Koichi

  Department Of Physics Faculty Of Faculty Of Science Hiroshima University

• Flouquet Jacques

  Spsms Cea

• Machida Yo

  Department Of Materials Science And Engineering Tokyo Institute Of Technology:(present Address)depar

• Aoki Dai

  SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1, 17 rue des martyrs, 38054 Grenoble, France

• Knebel Georg

  SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble F-38054, France

• Pourret Alexandre

  SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble F-38054, France

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