Abstract
CeRhIn5 is 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 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 antiferromagnetic 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.
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Fisher, R.A., Bouquet, F., Phillips, N.E. et al. Specific Heat of CeRhIn5: Pressure-Driven Transition from Antiferromagnetism to Heavy-Fermion Superconductivity. Journal of Superconductivity 15, 433–438 (2002). https://doi.org/10.1023/A:1021051004086
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DOI: https://doi.org/10.1023/A:1021051004086