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Specific heat of CeRhIn5: Pressure-driven transition from antiferromagnetism to heavy-fermion superconductivity

  • Author(s): Fisher, RA
  • Bouquet, F
  • Phillips, NE
  • Hundley, MF
  • Pagliuso, PG
  • Sarrao, JL
  • Fisk, Z
  • Thompson, JD
  • et al.
Abstract

CeRhIn5is known to show an unusual transition at a critical pressure of ∼15 kbar. Specific-heat data show a gradual change in the zero-field "magnetic" specific-heat anomaly from one typical of antiferromagnetic (AF) ordering at ambient pressure to one more characteristic of a Kondo singlet ground state at 21 kbar. However, at 15 kbar there is a discontinuous change from an AF ground state to a superconducting ground state, and evidence of a weak thermodynamic first-order transition. Above the critical pressure, the low-energy excitations are characteristic of superconductivity with line nodes in the energy gap, and, at intermediate pressures, of extended gaplessness. © 2003 Elsevier Science B.V. All rights reserved.

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