A Hierarchically-Organized Phase Diagram near a Quantum Critical Point in URu2Si2

Details A Hierarchically-Organized Phase Diagram near a Quantum Critical Point in URu2Si2 A Hierarchically-Organized Phase Diagram near a Quantum Critical Point in URu2Si2

2003-04-09

arxiv.org/abs/cond-mat/0304208v1

Phys. Rev. Lett. 91, 256401 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, twocolum texts, 3 coloured figure included, submitted to PRL

Scientific paper

10.1103/PhysRevLett.91.256401

A comprehensive transport study, as a function of both temperature and magnetic field in continuous magnetic fields up to 45 T reveals that URu2Si2 possesses all the essential hallmarks of quantum criticality at temperatures above 5.5 K and fields around 38 T, but then collapses into multiple low temperature phases in a hierarchically-organized phase diagram as the temperature is reduced. Although certain generic features of the phase diagram are very similar to those in the cuprates and heavy fermion superconductors, the existence of multiple ordered hysteretic phases near the field-tuned quantum critical point is presently unique to URu2Si2. This finding suggests the existence of many competing order parameters separated by small energy difference in URu2Si2.

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