Pressure effects and specific heat in superconducting HoNi2B2C

S. A. Carter; B. Batlogg; R. J. Cava; J. J. Krajewski; W. F. Peck

doi:10.1103/PhysRevB.51.12644

Pressure effects and specific heat in superconducting HoNi2B2C

S. A. Carter, B. Batlogg, R. J. 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 language	English (US)
Pages (from-to)	12644-12648
Number of pages	5
Journal	Physical Review B
Volume	51
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.51.12644
State	Published - 1995
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1103/PhysRevB.51.12644

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title = "Pressure effects and specific heat in superconducting HoNi2B2C",

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.",

author = "Carter, {S. A.} and B. Batlogg and Cava, {R. J.} and Krajewski, {J. J.} and Peck, {W. F.}",

year = "1995",

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T1 - Pressure effects and specific heat in superconducting HoNi2B2C

AU - Carter, S. A.

AU - Batlogg, B.

AU - Cava, R. J.

AU - Krajewski, J. J.

AU - Peck, W. F.

PY - 1995

Y1 - 1995

N2 - 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.

AB - 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.

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Pressure effects and specific heat in superconducting HoNi2B2C

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