| Issue |
EPL
Volume 89, Number 5, March 2010
|
|
|---|---|---|
| Article Number | 57006 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/89/57006 | |
| Published online | 26 March 2010 | |
Complex Landau-Ginzburg theory of the hidden order in URu2Si2
Department of Physics, Rutgers University - Piscataway, NJ 08854, USA
Corresponding author: haule@physics.rutgers.edu
Received:
22
December
2009
Accepted:
26
February
2010
We develop a Landau-Ginzburg theory of the hidden-order phase and the local moment antiferromagnetic phase of URu2Si2. We unify the two broken symmetries in a common complex-order parameter and derive many experimentally relevant consequences such as the topology of the phase diagram in magnetic field and pressure. The theory accounts for the appearance of a moment under application of stress and the thermal expansion anomaly across the phase transitions. It identifies the low-energy mode which is seen in the hidden-order phase near the commensurate wave vector (0, 0, 1) as the pseudo-Goldstone mode of the approximate U(1) symmetry.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2010
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