Phonon squeezing via correlations in the superconducting electron-phonon interaction

T. Hakiog¯lu; V. A. Ivanov; A. S. Shumovsky; B. Tanatar

doi:10.1103/PhysRevB.51.15363

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Phonon squeezing via correlations in the superconducting electron-phonon interaction

T. Hakiog¯lu, V. A. Ivanov, A. S. Shumovsky, B. Tanatar

DOI 10.1103/PhysRevB.51.15363 · Physical Review B

T1

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Abstract

Superconductivity in the conventional BCS model with correlated squeezed phonons is discussed. It is shown that the energy gap and the critical temperature are maximally enhanced in an optimum and finite range of squeezed coupling. For finite-squeezed coupling the ratio 2Δ/Tc becomes coupling-constant dependent and increases beyond the BCS value of 3.53. Ion-mass dependence of the squeezed coupling constant can yield variations of the isotope exponent from its conventional BCS value of 0.5.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown