Fizika Nizkikh Temperatur: Volume 43, Number 11 (November 2017), p. 1634-1641    ( to contents , go back )

Magnetic state nature of the weakly anion-excess manganite LaMnO3+δ

V.A. Pashchenko, I.K. Galetich, V.A. Sirenko, V.V. Eremenko, A.V. Eremenko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
E-mail: vpashchenko@ilt.kharkov.ua

V.V. Brook

Украинский научно-исследовательский институт экологических проблем (УкрНИИЭП) ул. Бакулина, 6, г. Харьков, 61166, Украина

Received June 13, 2017

Abstract

The work is devoted to elucidating the nature of magnetic state of the weakly anion-excess lanthanum manganite LaMnO3+δ (δ ≈ 0.0375). The features of the temperature and field dependences of the magnetic moment of a single crystal in the temperature range 2–350 K and in magnetic fields up to 5 T along the c axis are studied in detail. It is restored the field de-pendence of the observed temperature points, such as temperature of magnetic ordering, magnetic glass for-mation, magnetic phase separation. It is found a rela-tionship in the behavior of a number of singular po-ints. The obtained results fully agree with the model representations of magnetic phase separation, which predict a formation of self-trapped states of nanoscale ferromagnetic droplets in a bulk antiferromagnetic matrix.

PACS: 75.50.Ee Antiferromagnetics;
PACS: 74.78.Na Mesoscopic and nanoscale systems;
PACS: 75.10.–b General theory and models of mag-netic ordering;
PACS: 75.25.–j Spin arrangements in magnetically ordered materials;
PACS: 75.30.–m Intrinsic properties of magnetically ordered materials.

Key words: manganites, magnetic properties, phase separation.

Published online: September 25, 2017

Download 1332997 byte View Contents