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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2002, Volume 75, Issue 7, Pages 402–406
(Mi jetpl3073)
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This article is cited in 10 scientific papers (total in 10 papers)
CONDENSED MATTER
Experimental evidence for a magnetic two-phase state in manganites
R. V. Demina, L. I. Korolevaa, R. Shimchakb, G. Shimchakb a M. V. Lomonosov Moscow State University
b Institute of Physics, Polish Academy of Sciences
Abstract:
It is found that samples of manganites La$_{0.9}$Sr$_{0.1}$MnO$_3$ (single crystal), Eu$_{0.7}$A$_{0.3}$MnO$_3$ (A = Ca, Sr) (ceramics) and La$_{0.1}$Pr$_{0.6}$Ca$_3$MnO$_3$ and La$_{0.84}$Sr$_{0.16}$MnO$_3$ (thin epitaxial films) that are either field-cooled (in a magnetic field) or zero-field-cooled differ in low-temperature magnetization, and the hysteresis loop of field-cooled samples exhibits a displacement. This displacement signifies that a ferro-antiferromagnetic state occurs in these samples. The exchange integral $J\sim 10^{-6}\,$eV is calculated from this displacement, which describes the exchange Mn-O-Mn coupling through the interface ferromagnetic droplet-antiferromagnetic matrix. The magnetoresistance and volume magnetostriction of La$_{1-x}$Sr$_x$MnO$_3$ single crystals exhibit similar dependences on $x$, temperature, and the magnetic field in the vicinity of the Curie point, which points to the fact that these dependences are due to the same reason, namely, the occurrence of a magnetic two-phase ferro-antiferromagnetic state caused by strong $s-d$ exchange.
Received: 26.02.2002
Citation:
R. V. Demin, L. I. Koroleva, R. Shimchak, G. Shimchak, “Experimental evidence for a magnetic two-phase state in manganites”, Pis'ma v Zh. Èksper. Teoret. Fiz., 75:7 (2002), 402–406; JETP Letters, 75:7 (2002), 331–335
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Abstract page: | 180 | Full-text PDF : | 63 | References: | 29 |
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