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Journal Article

Gaussian fluctuation corrections to a mean-field theory of complex hidden order in URu2Si2

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Dzero,  Maxim
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.125131
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1806.08972.pdf
(Preprint), 291KB

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Citation

Shen, P., & Dzero, M. (2018). Gaussian fluctuation corrections to a mean-field theory of complex hidden order in URu2Si2. Physical Review B, 98(12): 125131. doi:10.1103/PhysRevB.98.125131.


Cite as: https://hdl.handle.net/21.11116/0000-0002-6E52-7
Abstract
Hidden-order phase transition in the heavy-fermion superconductor URu2Si2 exhibits the mean-field-like anomaly in temperature dependence of heat capacity. Motivated by this observation, here we explore the impact of the complex order parameter fluctuations on the thermodynamic properties of the hidden-order phase. Specifically, we employ the mean-field theory for the hidden order which describes the hidden-order parameter by an average of the hexadecapole operator. We compute the Gaussian fluctuation corrections to the mean-field theory equations including both the fluctuations due to "hidden order" as well as antiferromagnetic order parameters. We find that the Gaussian fluctuations lead to the smearing of the second-order transition rendering it to become the first-order one. The strength of the first-order transition is weakly dependent on the strength of underlying antiferromagnetic exchange interactions.