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Shear strain in Nd0.5Ca0.5MnO3 at high pressures

Författare:
Publiceringsår: 2005
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review Letters
Volym: 94
Nummer: 16
Dokumenttyp: Artikel
Förlag: American Physical Society

Sammanfattning

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*similar to 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.

Disputation

Nyckelord

  • Physics and Astronomy

Övrigt

Published
Yes
  • ISSN: 0031-9007

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