ISSN:
1572-9605
Keywords:
Ultrasonic experiments
;
lattice instability
;
single-crystalline LSCO
;
electron-phonon coupling
;
electronic band structure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Novel softening has been found in the transverse elastic constant (C 11–C 12)/2 below 50 K in single-crystalline La1.86Sr0.14CuO4 (LSCO) by high-precision ultrasonic measurements in magnetic fieldsH along thec axis. With decreasing temperature, this lattice softening persists down to the superconducting transition temperatureT c(H), which is reduced to 14 K by applying fields up to 14 T. BelowT c(H) the softening turns to rapid hardening. This behavior indicates the presence of lattice instability of the orthorhombic (Bmab) structure in the normal state of LSCO, which disappears in the superconducting state. This is evidence for the intimate interplay between high-T c superconductivity and the lattice instability in LSCO.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00724580
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