Journal ArticleDOI
Multiphase magnetic state of Ca1 − x La x MnO3 − δ single crystals (x = 0.03, 0.05, 0.07) containing oxygen vacancies
N. N. Loshkareva,A. V. Korolev,T. I. Arbuzova,N. I. Solin,A. M. Balbashov,N. V. Kostromitina +5 more
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TLDR
In this paper, the magnetic properties of single crystals grown in argon and oxygen were studied in a temperature range of 2-600 K in magnetic fields to 90 kOe for single crystals of Ca1 − xLaxMnO3 − δ with a weak electron doping (x ≤ 0.07) grown in the argon/oxy atmospheres.Abstract:
Magnetic properties (magnetization, dynamic and static susceptibility) and transport properties (resistance and magnetoresistance) have been studied in a temperature range of 2–600 K in magnetic fields to 90 kOe for single crystals of Ca1 − xLaxMnO3 − δ with a weak electron doping (x ≤ 0.07) grown in argon and oxygen atmospheres. The magnetic state of Ca1 − xLaxMnO3 − δ single crystals is multiphase. Below T = TN(G) ∼ 110 K, in all the crystals there coexists an AFM G phase with an FM contribution and an AFM C phase. In crystals with x = 0.07, a transition from the paramagnetic phase into the AFM C phase occurs in part of their volume below T ∼ 130–150 K. In crystals with x = 0.05 annealed in oxygen, an anomaly of paramagnetic susceptibility is observed near T* ∼ 270 K, which is related to the formation of FM clusters near defects. At x = 0.05 and 0.07, AFM correlations are retained in the paramagnetic state (to 600 K). The differences in the magnetic and transport properties of single crystals grown in argon and oxygen are explained by the various content of oxygen vacancies and by their possible ordering.read more
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Surface and exchange-bias effects in compacted CaMnO 3 − δ nanoparticles
V. Markovich,I. M. Fita,I. M. Fita,A. Wisniewski,Roman Puzniak,D. Mogilyansky,L. Titelman,L. Vradman,Moti Herskowitz,G. Gorodetsky +9 more
TL;DR: In this paper, the magnetic properties of compacted manganite nanoparticles with inverted AFM-core-FM-shell structure were investigated and an exchange coupling between the antiferromagnetic core and the ferromagnetic shell of the CMO nanoparticles was observed.
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Evolution of the Magnetic Ground State in the Electron-Doped Antiferromagnet CaMnO$_3$
TL;DR: In this paper, the effect of doping the parent compound with electrons by substitution of La for Ca has on the magnetic ground state was investigated. But the effect on the specific heat on the system Ca$1-x}$La${X}$MnO${3}$ (% $x\leq 0.10$) is reported.
Journal ArticleDOI
Synthesis and exchange bias effect of single-crystalline SrMn3O6−δ nanoribbons
TL;DR: In contrast with the antiferromagnetism in bulk SrMn3O6−δ nanoribbons, magnetization measurements show weak ferromagnetic magnetization in these nanors at low temperature.
Journal ArticleDOI
Electron-doped manganites based on CaMnO3
TL;DR: In this paper, a review of magnetic, electrical, and optical properties of electron-doped manganites was performed using single crystals containing vacancies in both the anion and cation sublattices.
Journal ArticleDOI
Magnetic, transport, and optical properties of Ca0.85Eu0.15MnO3 single crystal
S. V. Naumov,N. N. Loshkareva,Elena V. Mostovshchikova,N. I. Solin,A.V. Korolev,T. I. Arbuzova,S. V. Telegin,E. I. Patrakov +7 more
TL;DR: In this paper, the magnetic, transport and optical properties of the Ca0.85Eu0.15MnO3 single crystal are studied and compared in comparison with the properties of polycrystalline sample.
References
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Journal ArticleDOI
Evidence for magnetic polarons in the magnetoresistive perovskites
J. M. De Teresa,M. R. Ibarra,Pedro A. Algarabel,Clemens Ritter,Clara Marquina,Javier Blasco,Jose H. Garcia,A. del Moral,Z. Arnold +8 more
TL;DR: In this article, a combination of volume thermal expansion (with and without an applied field), magnetic susceptibility and small-angle neutron scattering measurements was used to detect magnetic polarons above the ferromagnetic ordering temperature, Tc.
Journal ArticleDOI
Anomalous Transport Phenomena in Eu-Chalcogenide Alloys
Tadao Kasuya,A. Yanase +1 more
TL;DR: In this article, anomalous optical, magnetic, and transport phenomena have been found in Eu-chalcogenide alloys, where strong $d\ensuremath{-}f$ exchange interaction between the magnetic-exciton electron of $5d$ character and the electrons in the surrounding ions is the origin of the anomaly.
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Open questions in CMR manganites, relevance of clustered states and analogies with other compounds including the cuprates
TL;DR: In this paper, a list of 'things we know' and 'thing we do not know' in manganites and other compounds is presented. But the list is limited to compounds that do not involve ferromagnets.
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Open Questions in CMR Manganites, Relevance of Clustered States, and Analogies with other Compounds
TL;DR: In this article, a list of ''things we know'' and '' things we do not know'' in manganites is presented. But the main new result of recent manganite investigations is the discovery of tendencies toward inhomogeneous states, both in experiments and in simulations of models, although considerably more work is needed to fully confirm these ideas.
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CaMnO2.5 and Ca2MnO3.5: New oxygen-defect perovskite-type oxides
TL;DR: In this paper, the precursors CaMnO 3 and Ca 2 MnO 4 were reduced with any one of a variety of inorganic (H 2, NH 3 ) or organic (C 2 H 4, C 3 H 6 ) reducing agents between 300 and 500°C.