Electron density of states in the borocarbide intermetallic superconductors
S. A. Carter, B. Batlogg, R. J. Cava, J. J. Krajewski, W. F. Peck, Jr., H. Takagi
DOI 10.1103/PhysRevB.50.4216 · Physical Review B
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Abstract
We present heat-capacity measurements in a magnetic field up to 7.7 T on the recently discovered borocarbide intermetallic superconductors LuNi2B2C and LaPt1.7Au0.3B2C. For LuNi2B2C with Tc=16.5 K, we find a large density of states at the Fermi level, γ∼19(2) mJ/mole K2, and an effective Debye temperature ΘD of 345 K. In comparison, LaPt1.7Au0.3B2C, with Tc=10.2 K, has a γ of 7.5(1.5) mJ/mole K2 and a smaller Debye temperature ΘD of 220 K. Through comparison with the specific-heat anomaly at Tc, ΔC/γTc, the magnetic susceptibility, and the calculated band structure, these compounds are found to be in the weak-to-intermediate coupling limit with λ≊0.5–1.0. Their position on the γ-Tc plot indicates dominant phonon-mediated electron pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.5 | Pressure not reported | onset |
| LaPt1.7Au0.3B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.2 | Pressure not reported | onset |
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