Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2

Y. Kohama; A. Sologubenko; N. R. Dilley; V. S. Zapf; M. Jaime; J. Mydosh; A. Paduan-Filho; K. Al-Hassanieh; P. Sengupta; S. Gangadharaiah; A. L. Chernyshev; C. D. Batista

doi:10.1103/PhysRevLett.106.037203

Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2

Strongly Correlated Electrons 2013-08-26 v2 Quantum Gases

Authors: Y. Kohama , A. Sologubenko , N. R. Dilley , V. S. Zapf , M. Jaime , J. Mydosh , A. Paduan-Filho , K. Al-Hassanieh , P. Sengupta , S. Gangadharaiah , A. L. Chernyshev , C. D. Batista

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Abstract

In a number of quantum paramagnets, magnetic field can induce a quantum phase transition to an antiferromagnetic state which exists for a range of fields Hc1 < H < Hc2. Generally, these compounds exhibit a significant asymmetry in their properties at low- and high-field transitions. Here we present detailed specific heat and thermal conductivity measurements in NiCl2-4SC(NH2)2 together with analytical and numerical results. We show that the asymmetry is caused by a strong renormalization of the effective mass of spin excitations due to quantum fluctuations for H<Hc1 that are absent for H<Hc2.

Keywords

quantum paramagnet quantum phase transition antiferromagnetism mass renormalization quantum fluctuations specific heat thermal conductivity

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@article{arxiv.1009.0053,
  title  = {Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2},
  author = {Y. Kohama and A. Sologubenko and N. R. Dilley and V. S. Zapf and M. Jaime and J. Mydosh and A. Paduan-Filho and K. Al-Hassanieh and P. Sengupta and S. Gangadharaiah and A. L. Chernyshev and C. D. Batista},
  journal= {arXiv preprint arXiv:1009.0053},
  year   = {2013}
}

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4 pages, 3 figures. Acepted for publication in Phy. Rev. Lett

Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2

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