Pressure effects and specific heat in superconducting HoNi2B2C
S. A. Carter, B. Batlogg, R. J. Cava, J. J. Krajewski, W. F. Peck, Jr.
DOI 10.1103/PhysRevB.51.12644 · Physical Review B
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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, T≫TN, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.4 | Pressure unresolved | onset |
| HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.4 | Pressure unresolved | onset |
| HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.4 | Pressure unresolved | onset |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.4 | Pressure not reported | unknown |
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