Phonon and electron anomalies in the perovskite superconductor (La1.85Sr0.15)Cu0.95Sn0.05O4
Ημερομηνία
1987Συγγραφέας
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Matykiewicz, J. M.
Kimball, C. W.
Dwight, A. E.
Dunlap, B. D.
Slaski, M.
Fradin, F. Y.
Source
Physics Letters AVolume
121Pages
307-310Google Scholar check
Metadata
Εμφάνιση πλήρους εγγραφήςΕπιτομή
Mössbauer measurements have been made at 199Sn in the perovskite superconductors La1.85Sr0.15Cu1-xSnxO4. The Sn valence is 4+ for all concentrations. The temperature dependence of the mean-squared displacement for x=0.05 shows phonon softening near 75 and 170 K θD=402 K above 180 K, between 77 and 160 K, and θD is temperature dependent below 77 K. Below 250 K the shift indicates electronic structure changes characteristic of a phase transformation. © 1987.