I. O. Troyanchuk, D. V. Karpinsky, M. V. Bushinsky, V. Sikolenko, V. Efimov, A. Cervellino, “The low-temperature macroscopic phase separation in La$_{0.5}$Ba$_{0.5}$CoO$_{3-\delta}$ cobaltite”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2011, Volume 93, Issue 3,Pages 154

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CONDENSED MATTER

The low-temperature macroscopic phase separation in La$_{0.5}$Ba$_{0.5}$CoO$_{3-\delta}$ cobaltite

I. O. Troyanchuk^a, D. V. Karpinsky^a, M. V. Bushinsky^a, V. Sikolenko^bc, V. Efimov^c, A. Cervellino^d

^a SSPA "Scientific-Practical Materials Research Centre of NAS of Belarus", 220072 Minsk, Belarus
^b Laboratory for Neutron Scattering, ETH Zurich and Paul Sherrer Institute, CH-5232 Villigen, Switzerland
^c Joint Institute for Nuclear Research, Dubna, RU-141980 Russia
^d Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

Abstract: La$_{0.5}$Ba$_{0.5}$CoO$_{2.87}$ has been characterized with neutron and synchrotron powder diffraction and magnetization measurements. This compound was shown to have a cubic crystal structure at temperatures above 200 K whereas slightly above the Curie point $T_c\sim170$ K the structural separation into two different pseudocubic phases gradually develops upon cooling. The structural transformation is reversible. At 2 K the sample consists of G-type antiferromagnetic oxygen-poor and ferromagnetic oxygen-rich phases (approximately 33% and 66% respectively).

Received: 08.12.2010

Language: English