Pressure effects and specific heat in superconducting HoNi2B2C

S. A. Carter, B. Batlogg, Robert Joseph Cava, J. J. Krajewski, W. F. Peck

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Abstract

We have studied the interaction of superconductivity (Tc=8.4 K) and magnetism (TN=5 K) in the HoNi2B2C system. Specific-heat measurements at 0 and 2 T indicate that the antiferromagnetic ground state involves a Ho 4f doublet, with the entropy shifting to higher temperatures, TTN, with increasing magnetic field. The heat-capacity anomaly at Tc, ΔC/Tc, is 10 (2) mJ/mole K2, similar to the values found for other borocarbide superconductors where the density of states at the Fermi level is comprised primarily of metal d states. Magnetic susceptibility and resistivity measurements under hydrostatic pressure P reveal that dTc/dP∼0.07 (0.04) K/kbar and dTN/dP∼0.25 (0.03) up to 7 kbar. These results reveal that the structure has an important influence on the superconducting and magnetic properties of HoNi2B2C.

Original languageEnglish (US)
Pages (from-to)12644-12648
Number of pages5
JournalPhysical Review B
Volume51
Issue number18
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Carter, S. A., Batlogg, B., Cava, R. J., Krajewski, J. J., & Peck, W. F. (1995). Pressure effects and specific heat in superconducting HoNi2B2C. Physical Review B, 51(18), 12644-12648. https://doi.org/10.1103/PhysRevB.51.12644