Phonons and superconductivity in Nd2−xCexCuO4

H. Chen; J. Callaway

doi:10.1103/PhysRevB.46.14321

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Phonons and superconductivity in Nd2−xCexCuO4

H. Chen, J. Callaway

DOI 10.1103/PhysRevB.46.14321 · Physical Review B

T1

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Abstract

We investigate superconducting properties of Nd2−xCexCuO4 using conventional strong-coupling theory. The Eliashberg equations were solved based on a realistic model of the phonon density of states. The calculated properties are in good agreement with available experimental data. Specifically, we find the partial isotope exponents to be αNd=0.066, αCu=0.148, and αO=0.035. The coupling parameter λ is found to be 1.135 and 2Δ0/kBTc=4.458. Our calculated quasiparticle density of states is also consistent with experiment. This study suggests that phonons in Nd2−xCexCuO4 may have a role similar to that in conventional superconductors in which they mediate electron pairing.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	unknown
Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	unknown
Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown