Bulk-modulus anomalies at the superconducting transition of single-phase YBa2Cu3O7

D. J. Bishop; A. P. Ramirez; P. L. Gammel; B. Batlogg; E. A. Rietman; R. J. Cava; A. J. Millis

doi:10.1103/PhysRevB.36.2408

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Bulk-modulus anomalies at the superconducting transition of single-phase YBa2Cu3O7

D. J. Bishop, A. P. Ramirez, P. L. Gammel, B. Batlogg, E. A. Rietman, R. J. Cava, A. J. Millis

DOI 10.1103/PhysRevB.36.2408 · Physical Review B

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Abstract

We report sound-velocity measurements on polycrystalline single-phase YBa2Cu3O7 with a Tc of 90 K. The sound velocity is found to increase as the temperature is reduced from room temperature in contrast to the decrease observed in La1.85Sr0.15CuO4. At Tc there is no discontinuity in the sound velocity within experimental resolution, as expected from thermodynamic arguments and the small value of dTcdP. As the temperature is lowered below Tc the sound velocity increases at a greater rate. A similar increase below Tc is observed in La1.85Sr0.15CuO4. The magnitude of the sound-velocity increase below Tc is much larger than observed in conventional superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown