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Title: Magnetic, electrical, and optical properties of electron-doped Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}}(x {<=} 0.12) single crystals

Abstract

The magnetic, electrical, and optical properties of Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}}(x {<=} 0.12) manganite single crystals have been studied. The state with a spatially inhomogeneous electron distribution has been found. Interrelations between the electric and magnetic subsystems are analyzed. The obtained magnetic data show evidence for the formation of a G-type antiferromagnetic (G-AFM) phase with a spin-canted structure in the crystal with x = 0.05, for which the Curie and Neel temperatures are T{sub C} T{sub N}(G) = 115 K. On cooling from the paramagnetic state, the crystals with x 0.10 and 0.12 exhibit transitions from the paramagnetic to a C-type antiferromagnetic (C-AFM) phase in a part of the volume at T{sub N}(C) = 150 and 200 K, and from the paramagnetic to the G-type antiferromagnetic (G-AFM) phase in the remaining volume at T{sub N}(G) = 110 and 108 K, respectively. The onset of the C-type magnetic phase nucleation in crystals is observed at lower dopant (La) concentrations than in polycrystalline samples, which is explained by the deviation of single crystals from the stoichiometry with respect to oxygen. The magnetic phase transitions are manifested by anomalies in the electric resistance and magnetoresistance of doped crystals. An analysis of the electricalmore » and optical properties of the samples shows evidence of (i) the formation of a charge energy gap in the C-AFM phase with retained paramagnetic metallic regions and (ii) the presence of ferromagnetic 'metallic' droplets in the insulating G-AFM phase. The multiphase state of Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}} manganite single crystals featuring the coexistence of two magnetic phases, the regions with orbital/charge ordering, and the FM 'metallic' droplets is related to a competition of exchange interactions by the superexchange and double exchange mechanisms.« less

Authors:
; ; ; ;  [1];  [2]
  1. Russian Academy of Science, Institute of Metal Physics, Ural Division (Russian Federation)
  2. Moscow Power Engineering Institute (Russian Federation)
Publication Date:
OSTI Identifier:
21067742
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 102; Journal Issue: 2; Other Information: DOI: 10.1134/S1063776106020051; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; CALCIUM COMPOUNDS; DOPED MATERIALS; ELECTRONS; EXCHANGE INTERACTIONS; LANTHANUM COMPOUNDS; MAGNETORESISTANCE; MANGANATES; MONOCRYSTALS; NEEL TEMPERATURE; NUCLEATION; OPTICAL PROPERTIES; PARAMAGNETISM; PHASE TRANSFORMATIONS; POLYCRYSTALS; SPIN; STOICHIOMETRY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K

Citation Formats

Loshkareva, N. N., E-mail: loshkareva@imp.uran.ru, Korolev, A. V., Solin, N. I., Mostovshchikova, E. V., Naumov, S. V., and Balbashov, A. M. Magnetic, electrical, and optical properties of electron-doped Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}}(x {<=} 0.12) single crystals. United States: N. p., 2006. Web. doi:10.1134/S1063776106020051.
Loshkareva, N. N., E-mail: loshkareva@imp.uran.ru, Korolev, A. V., Solin, N. I., Mostovshchikova, E. V., Naumov, S. V., & Balbashov, A. M. Magnetic, electrical, and optical properties of electron-doped Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}}(x {<=} 0.12) single crystals. United States. doi:10.1134/S1063776106020051.
Loshkareva, N. N., E-mail: loshkareva@imp.uran.ru, Korolev, A. V., Solin, N. I., Mostovshchikova, E. V., Naumov, S. V., and Balbashov, A. M. Wed . "Magnetic, electrical, and optical properties of electron-doped Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}}(x {<=} 0.12) single crystals". United States. doi:10.1134/S1063776106020051.
@article{osti_21067742,
title = {Magnetic, electrical, and optical properties of electron-doped Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}}(x {<=} 0.12) single crystals},
author = {Loshkareva, N. N., E-mail: loshkareva@imp.uran.ru and Korolev, A. V. and Solin, N. I. and Mostovshchikova, E. V. and Naumov, S. V. and Balbashov, A. M.},
abstractNote = {The magnetic, electrical, and optical properties of Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}}(x {<=} 0.12) manganite single crystals have been studied. The state with a spatially inhomogeneous electron distribution has been found. Interrelations between the electric and magnetic subsystems are analyzed. The obtained magnetic data show evidence for the formation of a G-type antiferromagnetic (G-AFM) phase with a spin-canted structure in the crystal with x = 0.05, for which the Curie and Neel temperatures are T{sub C} T{sub N}(G) = 115 K. On cooling from the paramagnetic state, the crystals with x 0.10 and 0.12 exhibit transitions from the paramagnetic to a C-type antiferromagnetic (C-AFM) phase in a part of the volume at T{sub N}(C) = 150 and 200 K, and from the paramagnetic to the G-type antiferromagnetic (G-AFM) phase in the remaining volume at T{sub N}(G) = 110 and 108 K, respectively. The onset of the C-type magnetic phase nucleation in crystals is observed at lower dopant (La) concentrations than in polycrystalline samples, which is explained by the deviation of single crystals from the stoichiometry with respect to oxygen. The magnetic phase transitions are manifested by anomalies in the electric resistance and magnetoresistance of doped crystals. An analysis of the electrical and optical properties of the samples shows evidence of (i) the formation of a charge energy gap in the C-AFM phase with retained paramagnetic metallic regions and (ii) the presence of ferromagnetic 'metallic' droplets in the insulating G-AFM phase. The multiphase state of Ca{sub 1-x}La{sub x}MnO{sub 3-{delta}} manganite single crystals featuring the coexistence of two magnetic phases, the regions with orbital/charge ordering, and the FM 'metallic' droplets is related to a competition of exchange interactions by the superexchange and double exchange mechanisms.},
doi = {10.1134/S1063776106020051},
journal = {Journal of Experimental and Theoretical Physics},
number = 2,
volume = 102,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}