TY - JOUR
T1 - Electron density of states in the borocarbide intermetallic superconductors
AU - Carter, S. A.
AU - Batlogg, B.
AU - Cava, R. J.
AU - Krajewski, J. J.
AU - Peck, W. F.
AU - Takagi, H.
PY - 1994/1/1
Y1 - 1994/1/1
N2 - 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 λ0.5-1.0. Their position on the γ-Tc plot indicates dominant phonon-mediated electron pairing.
AB - 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 λ0.5-1.0. Their position on the γ-Tc plot indicates dominant phonon-mediated electron pairing.
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U2 - 10.1103/PhysRevB.50.4216
DO - 10.1103/PhysRevB.50.4216
M3 - Article
AN - SCOPUS:0000668309
SN - 0163-1829
VL - 50
SP - 4216
EP - 4219
JO - Physical Review B
JF - Physical Review B
IS - 6
ER -