Compressibility of the HgBa2Can−1CunO2n+2+δ (n=1,2,3) high-temperature superconductors
J. H. Eggert, J. Z. Hu, H. K. Mao, L. Beauvais, R. L. Meng, C. W. Chu
DOI 10.1103/PhysRevB.49.15299 · Physical Review B
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Abstract
The transition temperatures (Tc) of the homologous series HgBa2Can−1CunO2n+2+δ of high-temperature superconductors show very large (∼30 K) pressure enhancements, saturating at 118, 154, and 164 K for Hg1201, Hg1212, and Hg1223, respectively. We have measured the compressibility of the first three mercury superconductors in a diamond-anvil cell using energy-dispersive synchrotron x-ray diffraction. We report the tetragonal-cell parameters a and c up to 30 GPa. We find ambient-pressure bulk moduli, KV0==-V0(∂P/∂V)0, of 65.4(3.0), 91.6(4.7), and 83.8(10.5) GPa for Hg1201, Hg1212, and Hg1223, respectively. The Hg superconductors are highly compressible compared to other high-temperature superconductors which generally show bulk moduli in the range of 100–200 GPa. The relation c=A+B(n-1) holds for the c-axis cell parameter at ambient pressure, however, the relation breaks down at high pressures.
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 |
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 128 | Pressure unresolved | 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 |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 118 | Pressure not reported | unknown |
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 154 | Pressure not reported | unknown |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 164 | 30 GPa | unknown |
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