Temperature-pressure phase diagram of U Ru2 Si2 from resistivity measurements and ac calorimetry: Hidden order and Fermi-surface nesting

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • E. Hassinger - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • G. Knebel - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • K. Izawa - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • P. Lejay - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • B. Salce - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • J. Flouquet - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)

Abstract

By performing combined resistivity and calorimetric experiments under pressure, we have determined a precise temperature-pressure (T,P) phase diagram of the heavy fermion compound U Ru2 Si2. It will be compared with previous diagrams determined by elastic neutron diffraction and strain gauge techniques. At first glance, the low-pressure ordered phase referred to as hidden order is dominated by Fermi-surface nesting, which has strong consequences on the localized spin dynamics. The high-pressure phase is dominated by large moment antiferromagnetism (LMAF) coexisting with at least dynamical nesting needed to restore on cooling a local moment behavior. ac calorimetry confirms unambiguously that bulk superconductivity does not coexist with LMAF. U Ru2 Si2 is one of the most spectacular examples of the dual itinerant and local character of uranium-based heavy fermion compounds.

Details

Original languageEnglish
Article number115117
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number11
Publication statusPublished - 12 Mar 2008
Peer-reviewedYes
Externally publishedYes