Mesoscopic magnetic inhomogeneities in the low-temperature phase and structure of Sm1−x SrxMnO3 (x &lt; 0.5) perovskite

Runov, V. V.; Chernyshov, Dmitry; Курбаков, А. И.; Runova, M. K.; Trunov, V. A.; Okorokov, A. I.

doi:10.1134/1.1334992

Cited by 26 publications

(25 citation statements)

References 29 publications

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“…M decreases sharply at a temperature of 134 K; that is the Curie temperature of ferromagnetic clusters. It is close to the value T C = 126 K determined in [2][3][4][5]. Thus, the value of 4 is significantly higher than T C , what indicates to the presence of the CE-type antiferromagnetic clusters (whose sizes may change with temperature) in the temperature range T C < T < 4.…”

Section: Methodssupporting

confidence: 81%

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The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm_0.55Sr_0.45MnO₃Manganites

Koroleva

Morozov

Zhakina

2014

EPJ Web of Conferences

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Abstract. Thermopower α and magnetothermopower ∆α/α were studied in the single-crystal Sm 0.55 Sr 0.45 MnO 3 samples, containing clusters of following three types: ferromagnetic clusters with the Curie temperature T C = 134 K, A-type antiferromagnetic clusters with the Neel temperature T NA ≤ T C and CE-type antiferromagnetic clusters with the T NCE = 240 K. Temperature dependence of α and ∆α/α have extrema in the T NCE -region: large maximum on α(T) and sharp minimum on {∆α/α}(T). Negative magnetothermopower in minimum achieves the giant value 50% in magnetic field H = 13,2 kOe. As will be shown below thermopower is essentially caused by the presence of CE-type antiferromagnetic clusters, in which exists charge order (CO), displacing oxygen ions. Modified crystalline lattice inside clusters causes change of thermopower in them. This thermopower influences on the voltage drop on sample at measurement of thermopower and, consequently, on the effective value α of the whole sample. Enclosure of the magnetic field in the T NCE , which accelerates the destruction of the CE-type antiferromagnetic order, causes sharp decrease of total thermopower. This means that the CE-type antiferromagnetic clusters with CO order are the main contributors to the thermopower of the whole sample.

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Section: Methodssupporting

confidence: 81%

“…Giant effects of the magnetoresistance and the volume magnetostriction were found in this compound previously [1]. Using neutron and electron diffraction and measuring the magnetic properties of the Sm 0.5+x Sr 0.5-x MnO 3 (x = 0.05, 0.10) system, authors of [2][3][4][5] …”

Section: Introductionmentioning

confidence: 95%

The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm_0.55Sr_0.45MnO₃Manganites

Koroleva

Morozov

Zhakina

2014

EPJ Web of Conferences

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“…There were no detailed data on the crystal and magnetic structures of the Sm-Sr system, which are necessary to explain all physical phenomena in these compounds. In this work, we present the electronic, structural and magnetic phase diagram of perovskite manganites Sm 1 À x Sr x MnO 3 (0.16 rxr0.67) constructed using the results of our long-term systematic studies of this system by highresolution neutron powder diffraction on samples synthesized using 152 Sm and 154 Sm isotopes reported previously [1][2][3][4][5][6][7][8][9][10] as well as new unreported data.…”

Section: Introductionmentioning

confidence: 98%

Electronic, structural and magnetic phase diagram of Sm1-xSrxMnO3 manganites

Курбаков

2010

Journal of Magnetism and Magnetic Materials

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“…In antiferromagnetic semiconductors, the electron density is increased near impurities (compared to other regions of the crystal), so the crystal consists of antiferromagnetic matrix in which ferromagnetic spheres (collective ferrons) with increased electron density are symmetrically located. Through study of data from neutron and electron scattering as well of magnetic properties of Sm (1-x) Sr x MnO 3 system provided in [13][14][15][16], it has been shown that in compounds with x ≤ 0.33 clusters of ferron type located in A-type antiferromagnetic matrix are present. Whereas in the compounds with 0.45 < x < 0.5 are clusters with antiferrmagnetic charge-orbital ordering in which the lattice parameters reduce.…”

Section: Introductionmentioning

confidence: 99%

Connection of Thermopower, Magneto Thermopower with Resistivity and Magnetoresistivity in Nd(1-x)SrxMnO3 and Sm(1-x)SrxMnO3 Manganites

Koroleva¹,

Batashev²,

Morozov³

et al. 2017

AJPA

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An experimental study of thermopower, magneto thermopower, magnetoresistivity and magnetization of Nd (1-x) Sr x MnO 3 and Sm (1-x) Sr x MnO 3 with 0 ≤ х ≤ 0.3 was conducted. A steep rise of thermopower as well as giant values of magneto thermopower and magnetoresistivity were observed near Curie temperature Т С in compounds with 0.15 ≤ х ≤ 0.3. On the other hand, no special features were found in case of х = 0. It has been known that compounds with 0.1 ≤ х ≤ 0.3 consist of ferromagnetic clusters of ferron (magnetic polaron) type located in A-type antiferromagnetic matrix. An increase of thermopower near Т С is caused by ferrons as with the application of magnetic field or temperatures higher than Т С thermopower falls sharply due to the destruction of ferrons. So, the value of thermopower is directly connected to the number of magnetic polarons in sample. Therefore, thermopower in doped magnetic semiconductors is determined by level of doping and volume of the sample.

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Mesoscopic magnetic inhomogeneities in the low-temperature phase and structure of Sm1−x SrxMnO3 (x < 0.5) perovskite

Cited by 26 publications

References 29 publications

The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm_0.55Sr_0.45MnO₃Manganites

The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm_0.55Sr_0.45MnO₃Manganites

Electronic, structural and magnetic phase diagram of Sm1-xSrxMnO3 manganites

Connection of Thermopower, Magneto Thermopower with Resistivity and Magnetoresistivity in Nd<sub>(1-x)</sub>Sr<sub>x</sub>MnO<sub>3</sub> and Sm<sub>(1-x)</sub>Sr<sub>x</sub>MnO<sub>3</sub> Manganites

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Mesoscopic magnetic inhomogeneities in the low-temperature phase and structure of Sm1−x SrxMnO3 (x < 0.5) perovskite

Cited by 26 publications

References 29 publications

The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm0.55Sr0.45MnO3Manganites

The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm0.55Sr0.45MnO3Manganites

Electronic, structural and magnetic phase diagram of Sm1-xSrxMnO3 manganites

Connection of Thermopower, Magneto Thermopower with Resistivity and Magnetoresistivity in Nd&lt;sub&gt;(1-x)&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;MnO&lt;sub&gt;3&lt;/sub&gt; and Sm&lt;sub&gt;(1-x)&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;MnO&lt;sub&gt;3&lt;/sub&gt; Manganites

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The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm_0.55Sr_0.45MnO₃Manganites

The Influence of Magnetic Inhomogeneous State on Thermopower and Magnetothermopower in Sm_0.55Sr_0.45MnO₃Manganites

Connection of Thermopower, Magneto Thermopower with Resistivity and Magnetoresistivity in Nd<sub>(1-x)</sub>Sr<sub>x</sub>MnO<sub>3</sub> and Sm<sub>(1-x)</sub>Sr<sub>x</sub>MnO<sub>3</sub> Manganites