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Shear Strain inNd0.5Ca0.5MnO3at High Pressures

Shear Strain inNd0.5Ca0.5MnO3at High Pressures

Authors :
Robert E. Dinnebier
Anthony Arulraj
Michael Hanfland
Stefan Carlson
Sander van Smaalen
Source :
Physical Review Letters. 94
Publication Year :
2005
Publisher :
American Physical Society (APS), 2005.

Abstract

High-pressure x-ray powder diffraction has been measured on the half doped rare earth manganite Nd0.5Ca0.5MnO3 up to a pressure of 15 GPa. We report the presence of a quantifiable amount of shear distortion of the MnO6 octahedra in Nd0.5Ca0.5MnO3 at high pressures. The lattice strain of Nd0.5Ca0.5MnO3 is minimal at a crossover pressure of p* approximately 7 GPa, with the same lattice strain above and below this pressure achieved by shear and Jahn-Teller-type distortions, respectively. The increase in shear strain with increasing pressure provides a mechanism for the insulating behavior of manganites at high pressures that has not been considered before.

Details

ISSN :
10797114 and 00319007
Volume :
94
Database :
OpenAIRE
Journal :
Physical Review Letters
Accession number :
edsair.doi...........d2b51a1f7a500d48c8171e3b05ebe53e
Full Text :
https://doi.org/10.1103/physrevlett.94.165504