Superconductivity at 17K in yttrium metal under nearly hydrostatic pressures up to 89GPa
J. J. Hamlin, V. G. Tissen, J. S. Schilling
DOI 10.1103/PhysRevB.73.094522 · Physical Review B
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Abstract
In an experiment in a diamond anvil cell utilizing helium pressure medium, yttrium metal displays a superconducting transition temperature which increases monotonically from Tc≃3.5K at 30GPa to 17K at 89.3GPa, one of the highest transition temperatures for any elemental superconductor. The pressure dependence of Tc differs substantially from that observed in previous studies under quasihydrostatic pressure to 30GPa. Remarkably, the dependence of Tc on relative volume V∕Vo is nearly linear over the entire pressure range above 33GPa, implying that higher values of Tc are likely at higher pressures. For the trivalent metals Sc, Y, La, and Lu, there appears to be some correlation between Tc and the ratio ra∕rc of the Wigner–Seitz radius to the ion core radius.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.5 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | 48 GPa | onset |
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | 33 GPa | onset |
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | 30 GPa | midpoint |
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