Volume dependence of the superconducting transition temperature for the high-temperature superconductor HgBa2CuO4+δ
Charles C. Kim, E. F. Skelton, S. B. Qadri, V. M. Browning, M. S. Osofsky, M. E. Reeves, D. H. Liebenberg
DOI 10.1103/PhysRevB.49.13075 · Physical Review B
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Abstract
The homologous series HgBa2Can−1CunO2n+2+δ (n=1,2,3,4) are the newest and most promising of the layered high-Tc superconducting materials, as demonstrated in setting the highest Tc among the known superconducting materials. The first of its series, HgBa2CuO4+δ, contains only one Cu-O plane per unit cell and is superconducting with Tc about 94 K. The superconducting transition temperature as a function of pressure, Tc(P), was measured to 4.5 GPa. Tc was determined from ac susceptibility measurements and pressure was determined near Tc from shifts in ruby fluorescence peaks. Tc increases monotonically with dTc(P)/dP≊1.8 K/GPa at ambient pressure. The volume as a function of pressure, V(P), was measured to 10 GPa. The lattice parameters were determined by energy-dispersive x-ray-diffraction methods and pressure was determined from shifts in ruby fluorescence peaks. The volume decreases monotonically producing an isothermal bulk modulus BV=104±17 GPa at ambient pressure. Both results were combined to produce Tc(V), which is more readily compared to theoretical models.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure unresolved | unknown |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure unresolved | onset |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | zero_resistance |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.97 | Pressure unresolved | onset |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.96 | Pressure unresolved | onset |
| TlBa2CuO5-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| (La0.9Ba0.1)2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
| (La0.9Ba0.1)2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52.5 | 1.2 GPa | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 135 | Pressure unresolved | unknown |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 150 | 15 GPa | unknown |
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