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Paper detail

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

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.

preprint2010arXivOpen access
Y. KohamaA. SologubenkoN. R. DilleyV. S. ZapfM. JaimeJ. MydoshA. Paduan-FilhoK. Al-HassaniehP. SenguptaS. GangadharaiahA. L. ChernyshevC. D. Batista
cond-mat.str-elcond-mat.quant-gas
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Authors

Y. KohamaA. SologubenkoN. R. DilleyV. S. ZapfM. JaimeJ. MydoshA. Paduan-FilhoK. Al-HassaniehP. SenguptaS. GangadharaiahA. L. ChernyshevC. D. Batista

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