Intermetallic charge-transfer transition in Bi1-xLaxNiO3 as the origin of the colossal negative thermal expansion

Kengo Oka, Masaichiro Mizumaki, Chika Sakaguchi, Alexandra Sinclair, Clemens Ritter, J. Paul Attfield, Masaki Azuma

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The nature of triclinic to orthorhombic phase transition, at which colossal negative thermal expansion is observed, and the magnetic ordering of Bi1−xLaxNiO3 have been investigated with neutron powder diffraction (NPD) and x-ray absorption spectroscopy techniques. The presence of a charge-transfer transition from (Bi/La)3+0.5Bi5+0.5Ni2+O3 to (Bi/La)3+Ni3+O3, accompanied by the simultaneous structural distortion, was confirmed. The NPD data also revealed that magnetic ordering is present only in the insulating triclinic phase. The metallic orthorhombic phase was found to be nonmagnetic down to 10 K.

Original languageEnglish
Article number014112
JournalPhysical Review B
Issue number1
Early online date29 Jul 2013
Publication statusPublished - 2013

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