Structure and magnetism in LaCoO3

Author: Belanger D P   Keiber T   Bridges F   Durand A M   Mehta A   Zheng H   Mitchell J F   Borzenets V  

Publisher: IOP Publishing

E-ISSN: 1361-648X|28|2|25602-25607

ISSN: 0953-8984

Source: Journal of Physics: Condensed Matter, Vol.28, Iss.2, 2016-01, pp. : 25602-25607

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Abstract

The temperature dependence of the hexagonal lattice parameter c of single crystal &$text{LaCo}{{text{O}}_{3}}$ ; (LCO) with H  =  0 and 800 Oe, as well as LCO bulk powders with H  =  0, was measured using high-resolution x-ray scattering near the transition temperature &${{T}_{text{o}}}approx 35$ ; K. The change of c(T) is well characterized by a power law in &$T-{{T}_{text{o}}}$ ; for &$T>{{T}_{text{o}}}$ ; and by a temperature independent constant for &$T<{{T}_{text{o}}}$ ; when convoluted with a Gaussian function of width 8.5 K. This behavior is discussed in the context of the unusual magnetic behavior observed in LCO as well as recent generalized gradient approximation calculations.

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