High pressure phase diagrams of CeRhIn${}_5$ and CeCoIn${}_5$ studied by ac calorimetry

Abstract

The pressure-temperature phase diagrams of the heavy fermion antiferromagnet CeRhIn${}_5$ and the heavy fermion superconductor CeCoIn${}_5$ have been studied under hydrostatic pressure by ac calorimetry and ac susceptibility measurements using diamond anvil cells with argon as pressure medium. In CeRhIn${}_5$, the use of a highly hydrostatic pressure transmitting medium allows for a clean simultaneous determination by a bulk probe of the antiferromagnetic and superconducting transitions. We compare our new phase diagram with the previous ones, discuss the nature (first or second order) of the various lines, and the coexistence of antiferromagnetic order and superconductivity. The link between the collaps of the superconducting heat anomaly and the broadening of the antiferromagnetic transition points to an inhomogeneous appearence of superconductivity below $P_c\approx 1.95$ GPa. Homogeneous bulk superconductivity is only observed above this critical pressure. We present a detailed analysis of the influence of pressure inomogeneities on the specific heat anomalies which emphasizes that the observed broadening of the transitions near $P_c$ is connected with the first order transition. For CeCoIn${}_5$ we show that the large specific heat anomaly observed at $T_c$ at ambient pressure is suppressed linearly at least up to 3 GPa.

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Cited by in corpus (24)

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• Superconducting and normal phases of FeSe single crystals at high pressure
• Magnetic field induced lattice anomaly inside the superconducting state of CeCoIn${}_5$: evidence of the proposed Fulde-Ferrell-Larkin-Ovchinnikov state
• Antiferromagnetism and Superconductivity in Cerium based Heavy Fermion Compounds
• Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An 115In-NQR study under pressure
• Strong Coupling between Antiferromagnetic and Superconducting Order Parameters in CeRhIn${}_5$ Studied by In-NQR Spectroscopy
• Competing nodal d-wave superconductivity and antiferromagnetism
• Discovery of magnetic phase transitions in heavy-fermion superconductor CeRh${}_2$As${}_2$
• Competition and/or Coexistence of Antiferromagnetism and Superconductivity in CeRhIn${}_5$ and CeCoIn${}_5$
• Magnetism and superconductivity of heavy fermion matter
• Ambient-pressure bulk superconductivity deep in the magnetic state of CeRhIn5
• Evidence for Coexistence of Bulk Superconductivity and Itinerant Antiferromagnetism in the Heavy Fermion System CeCo(In${}_{1-x}$Cd${}_x$)${}_5$
• Strain-induced inter-vortex interaction and vortex lattices in tetragonal superconductors
• Filamentary superconductivity across the phase diagram of Ba(Fe,Co)${}_2$As${}_2$
• Controlling unconventional superconductivity in artificially engineered $f$-electron Kondo superlattices
• Trends in Heavy Fermion Matter
• Non-linear effect of uniaxial pressure on superconductivity in CeCoIn5
• Pauli-Limited Superconductivity with Classical Magnetic Fluctuations
• Coupling between heavy fermion superconductor CeCoIn${}_5$ and antiferromagnetic metal CeIn${}_3$ through the atomic interface
• Correlation and disorder-enhanced nematic spin response in superconductors with weakly broken rotational symmetry
• Textured Superconductivity in the Presence of a Coexisting Order: Ce115s and Other Heavy-Fermion Compounds
• High-field specific heat and entropy obtained from adiabatic temperature change