A1 Journal article – refereed
Anomalous Thermal Expansion in (Pr,Ca)MnO3 due to Orbital Ordering




List of Authors: Jussi Tikkanen, Simo Kauhala, Hannu Huhtinen, Petriina Paturi
Publication year: 2015
Journal: Physics Procedia
Volume number: 75
Number of pages: 7
ISSN: 1875-3892

Abstract


The monoclinic lattice parameters of the perovskite manganites Pr(1-x)CaxMnO3 were systematically measured by XRD at the Ca doping levels x=0.4, 0.5 and 0.1 at temperatures from 83 K to 403 K. The orbital ordering transition observed around 250 K at x=0.4 and x=0.5, located by SQUID magnetometry, was associated with a transient cell volume expansion of order 0.1%, during which the CO-related monoclinic distortion set in. The anomalous cell expansion, arguably driven by electrostructural disorder, was of sufficient magnitude to locally dominate the thermal expansion.


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Last updated on 2019-21-08 at 20:34