Phonon and electron anomalies in the perovskite superconductor (La1.85Sr0.15)Cu0.95Sn0.05O4
Date
1987Author
Giapintzakis, JohnMatykiewicz, 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
Show full item recordAbstract
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.