Softening of Cu-O vibrational modes as a precursor to onset of superconductivity in EuBa2Cu3O7−δ
P. Boolchand, R. N. Enzweiler, Ivan Zitkovsky, Jack Wells, Wayne Bresser, Darl McDaniel, R. L. Meng, P. H. Hor, C. W. Chu, C. Y. Huang
DOI 10.1103/PhysRevB.37.3766 · Physical Review B
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Abstract
T-dependent Sn119 Mossbauer Debye-Waller factor f(T) in EuBa2Cu2.98Sn0.02O7−δ displays evidence of a substantial softening in lattice vibrations at T≤110 K. In a previous Eu151 study, no detectable softening in f(T) was found at the rare-earth site. These results taken together show that Sn atoms as a dilute impurity replace predominantly Cu(1) sites in the Cu-O chains of the orthorhombic structure. It appears that a softening in vibrational modes localized onto the Cu-O linear chains occurs as a precursor to the onset of superconductivity. These results show that phonons do appear to play an important role in electron pairing in these high-Tc oxide superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| EuBa2Cu2.98Sn0.02O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
| EuBa2Cu2.98Sn0.02O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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