Quantum Critical Point of Itinerant Antiferromagnet in Heavy Fermion

Hiroaki Kadowaki; Yoshikazu Tabata; Masugu Sato; Naofumi Aso; Stephane Raymond; Shuzo Kawarazaki

doi:10.1103/PhysRevLett.96.016401

Quantum Critical Point of Itinerant Antiferromagnet in Heavy Fermion

Strongly Correlated Electrons 2007-05-23 v7 Statistical Mechanics

Authors: Hiroaki Kadowaki , Yoshikazu Tabata , Masugu Sato , Naofumi Aso , Stephane Raymond , Shuzo Kawarazaki

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Abstract

A quantum critical point (QCP) of the heavy fermion Ce(Ru_{1-x}Rh_x)_2Si_2 (x = 0, 0.03) has been studied by single-crystalline neutron scattering. By accurately measuring the dynamical susceptibility at the antiferromagnetic wave vector k_3 = 0.35 c^*, we have shown that the energy width Gamma(k_3), i.e., inverse correlation time, depends on temperature as Gamma(k_3) = c_1 + c_2 T^{3/2 +- 0.1}, where c_1 and c_2 are x dependent constants, in a low temperature range. This critical exponent 3/2 +- 0.1 proves that the QCP is controlled by that of the itinerant antiferromagnet.

Keywords

quantum critical point itinerant antiferromagnet heavy fermion neutron scattering dynamical susceptibility critical exponent

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@article{arxiv.cond-mat/0504386,
  title  = {Quantum Critical Point of Itinerant Antiferromagnet in Heavy Fermion},
  author = {Hiroaki Kadowaki and Yoshikazu Tabata and Masugu Sato and Naofumi Aso and Stephane Raymond and Shuzo Kawarazaki},
  journal= {arXiv preprint arXiv:cond-mat/0504386},
  year   = {2007}
}

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4 pages, 3 figures

Quantum Critical Point of Itinerant Antiferromagnet in Heavy Fermion

Abstract

Keywords

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