Heat capacity of superconducting La1.85Sr0.15CuO4

B. D. Dunlap; M. V. Nevitt; M. Slaski; T. E. Klippert; Z. Sungaila; A. G. McKale; D. W. Capone; R. B. Poeppel; B. K. Flandermeyer

doi:10.1103/PhysRevB.35.7210

Heat capacity of superconducting La1.85Sr0.15CuO4

B. D. Dunlap, M. V. Nevitt, M. Slaski, T. E. Klippert, Z. Sungaila, A. G. McKale, D. W. Capone, R. B. Poeppel, B. K. Flandermeyer

DOI 10.1103/PhysRevB.35.7210 · Physical Review B

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Abstract

The heat capacity has been obtained for a sample of La1.85Sr0.15CuO4 which is superconducting with a transition temperature Tc=31 K. Although the heat capacity is dominated by the lattice in the vicinity of Tc, it has nonetheless been possible to observe the superconducting transition, thus verifying that this is bulk superconductivity. A lower limit is established for the heat-capacity anomaly of ΔC/Tc=(20±5) mJ/mole K2. Combined with estimates of the electronic heat capacity γ, this leads to 2≤ΔC/γTc≤10, compared with the Bardeen-Cooper-Schrieffer value of 1.43, which places this material well into the strong-coupling regime.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	unknown
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	unknown
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	unknown
La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36.2	Pressure not reported	unknown
Ba(PbxBi1-x)O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	unknown