Phonon-mediated superconducting transitions in layered cuprate superconductors
Xiao-Jia Chen, Viktor V. Struzhkin, Zhigang Wu, Russell J. Hemley, Ho-kwang Mao, Hai-Qing Lin
DOI 10.1103/PhysRevB.75.134504 · Physical Review B
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Abstract
A phonon-mediated d-wave BCS-like model is presented for a homologous series of layered cuprate superconductors. We show that the dependence of both the superconducting transition temperature Tc and oxygen isotope exponent α on the doping level, number of CuO2 layers, pressure, and cation disorder in the model superconducting series HgBa2Can−1CunO2n+2+δ can be well reproduced within one single theoretical framework. We also find that the theoretical model accounts well for the superconducting transitions in other homologous series such as the bismuth- and thallium-based family. Our results suggest that the interlayer coupling plays an important role in the significant enhancement of Tc and in the systematic reduction of α in a layered homologous series.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure not reported | unknown |
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