Weak coupling BCS-like superconductivity in the pnictide oxide Ba1−xNaxTi2Sb2O (x=0 and 0.15)
Melissa Gooch, Phuong Doan, Zhongjia Tang, Bernd Lorenz, Arnold M. Guloy, Paul C. W. Chu
DOI 10.1103/PhysRevB.88.064510 · Physical Review B
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Abstract
We report the results of low-temperature heat capacity measurements of the pnictide oxide superconductor BaTi2Sb2O doped with sodium. The temperature- and field-dependent heat capacity data are well described by a single-gap BCS theory. The estimated values for the normal-state Sommerfeld constant, the heat capacity jump at Tc, and the electron-phonon coupling constant are in favor of a conventional weak coupling superconductivity mediated by electron-phonon interaction. The results are discussed with regard to and compared with recent first-principles calculations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.85Na0.15Ti2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | midpoint |
| Ba0.85Na0.15Ti2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | onset |
| BaTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | midpoint |
| Ba1-xNaxTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | Pressure not reported | unknown |
| BaTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | unknown |
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