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

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

CeRhIn5 has an unusual transition at a critical pressure of ∼15 kbar. Specificheat data show a gradual change in the zero-field 'magnetic' anomaly from one typical of antiferromagnetic (AF) ordering at ambient pressure to one that is 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, with evidence of a weak thermodynamic first-order transition. For pressures near 12 kbar, there is a pressure-dependent, second-order transition. The low-energy excitations above 15 kbar are characteristic of superconductivity with line nodes in the energy gap, and with extended gapless behaviour at intermediate pressures less than 21 kbar.

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