Anomalous electron-phonon coupling probed on the surface of superconductor ZrB12
R. Khasanov, D. Di Castro, M. Belogolovskii, Yu. Paderno, V. Filippov, R. Brütsch, H. Keller
DOI 10.1103/PhysRevB.72.224509 · Physical Review B
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Abstract
Magnetization measurements under hydrostatic pressure up to 10.5kbar in zirconium dodecaboride ZrB12 superconductor (Tc≃6.0K at p=0) were carried out. A negative pressure effect on Tc with dTc∕dp=−0.0225(3)K∕kbar was observed. The electron-phonon coupling constant λel−ph decreases with increasing pressure with dlnλel−ph∕dp≃−0.20%∕kbar. The magnetic field penetration depth λ was studied in the Meissner state and, therefore, probes mainly the surface of the sample. The absolute values of λ and the superconducting energy gap at ambient pressure and zero temperature were found to be λ(0)=140(30)nm and Δ0=1.251(9)meV, respectively. Δ0 scales linearly with Tc as 2Δ0∕kBTc=4.79(1). The studies of the pressure effect on λ reveal that λ−2 increases with pressure with dlnλ−2(0)∕dp=0.60(23)%∕kbar. This effect cannot be explained within the framework of conventional adiabatic electron-phonon pairing, suggesting the possibility that close to the surface an unconventional nonadiabatic character of the electron-phonon coupling takes place.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ZrB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure unresolved | onset |
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