Bulk Superconductivity at 10 K in the Layered Compounds Y2C2I2 and Y2C2Br2
R. W. Henn, W. Schnelle, R. K. Kremer, A. Simon
DOI 10.1103/PhysRevLett.77.374 · Physical Review Letters
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Abstract
Resistivity, susceptibility, and specific heat measurements on the new layered superconductors Y2C2I2 and Y2C2Br2 have been performed to characterize their superconducting state. Our experiments indicate bulk superconductivity with Tc=9.97K for Y2C2I2 and Tc=5.04K for Y2C2Br2. An analysis of the specific heat anomalies at Tc in terms of the weak coupling BCS and the two-fluid model, as well as estimates based on McMillan's formula, reveals strong electron-phonon coupling in the present systems, in contrast to the related three-dimensional superconductor YC2 with Tc≈4.0K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y2C2I2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.97 | Pressure unresolved | unknown |
| Y2C2I2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | zero_resistance |
| Y2C2I2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.97 | Pressure unresolved | unknown |
| Y2C2Br2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.04 | Pressure unresolved | unknown |
| Y2C2Br2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure unresolved | zero_resistance |
| Y2C2Br2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.04 | Pressure unresolved | unknown |
| YC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
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