Motional broadening of Fe57 Mössbauer-effect resonance in cuprate superconductors
Y. Wu, S. Pradhan, P. Boolchand
DOI 10.1103/PhysRevLett.67.3184 · Physical Review Letters
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Abstract
The temperature dependence of the Fe57 resonance in YBa2(Cu0.98Fe0.02)4O8 samples shows evidence of a discontinuity in the observed linewidth Γ(T), isomer shift, and quadrupole splitting at Tc. Γ(T) is found to increase precipitously at T<Tc with the excess width ΔΓ(T) thermally activated. This behavior is a signature of a fluctuating electric-field gradient in the planes with the fluctuations slowing down in the superconducting phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2(Cu0.98Fe0.02)4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 62 | Pressure unresolved | onset |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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