Order-disorder-order phase transitions in the pyrochlore superconductorCd2Re2O7

Autor:	Lars Börjesson, Joakim Holmlund, Jakob Andreasson, Sten Eriksson, Christopher S. Knee, Mikael Käll
Rok vydání:	2005
Předmět:	Superconductivity Phase transition Materials science Condensed matter physics Pyrochlore engineering.material Condensed Matter Physics Light scattering Electronic Optical and Magnetic Materials Ion Tetragonal crystal system symbols.namesake Order (biology) engineering symbols Raman spectroscopy
Zdroj:	Physical Review B. 71
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.71.214518
Popis:	The structural phase transitions of the pyrochlore superconductor Cd2Re2O7 are investigated by Raman light scattering. The cubic to tetragonal transition at 200 K is characterized by the appearance of a broad mode originating from oxygen ion motion in agreement with recent theoretical predictions [I. A. Sergienko , Phys. Rev. Lett. 92, 065501 (2004)]. The appearance of well-defined low-frequency modes at the 120-K transition indicates that it is driven by ordering of the Cd ions within the channel voids of the distorted pyrochlore.
Databáze:	OpenAIRE
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