Colloquium: Hidden order, superconductivity, and magnetism: The unsolved case of URu2Si2

J. A. Mydosh and P. M. Oppeneer
Rev. Mod. Phys. 83, 1301 – Published 16 November 2011

Abstract

This Colloquium reviews the 25 year quest to understand the continuous (second-order), mean-field-like phase transition occurring at 17.5 K in URu2Si2. About ten years ago, the term “hidden order” (HO) was coined and has since been utilized to describe the unknown ordered state, whose origin cannot be disclosed by conventional solid-state probes, such as x rays, neutrons, or muons. The HO is able to support superconductivity at lower temperatures (Tc1.5K), and when magnetism is developed with increasing pressure both the HO and the superconductivity are destroyed. Other ways of probing the HO are via Rh doping and large magnetic fields. During the last few years a variety of advanced techniques have been tested to probe the HO state and these attempts will be summarized. A digest of recent theoretical developments is also included. It is the objective of this Colloquium to shed additional light on the HO state and its associated phases in other materials.

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  • Received 28 January 2011

DOI:https://doi.org/10.1103/RevModPhys.83.1301

© 2011 American Physical Society

Authors & Affiliations

J. A. Mydosh*

  • Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, NL-2300 RA Leiden, The Netherlands

P. M. Oppeneer

  • Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden

  • *mydosh@physics.leidenuniv.nl
  • peter.oppeneer@physics.uu.se

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Vol. 83, Iss. 4 — October - December 2011

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