Nature of the magnetic phase transition in single-crystal LaMnO3+δ

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

doi:10.1063/1.4723680

Cited by 6 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of a maximum in the anisotropy of magnetic susceptibility for single crystal 1 presumably indicates the presence of the antiferromagnetic phase, which is consistent with the observation of the "antiferromagnetic" maximum in the temperature dependence of the magnetic susceptibility of this single crystal. 22 Along with the positive Curie-Weiss temperature (inset of Fig. 3), this confirms the assumption about coexistence of antiferroand ferromagnetic phases in the sample of such composition.…”

Section: Resultssupporting

confidence: 83%

“…It also contains the references from which the data were obtained. 17,[20][21][22]38,40,[43][44][45] It should be noted that Fig. 5 (as well as Fig.…”

Section: Resultsmentioning

confidence: 85%

“…The temperature dependence of the magnetization of segregated perovskites in a constant magnetic field at different cooling conditions, in a fixed magnetic field (field cooled, FC) and in zero field (zero field cooled, ZFC) has been the subject of a particularly detailed study. It turns out [12][13][14][15][16][17][18][19][20][21][22][23] that the temperature dependences of the magnetization measured under ZFC and FC conditions coincide only at temperatures above a certain temperature T * , which depends on the magnetic field H. Below this temperature they "split." This observation is consistent with the peculiarities of the magnetic phase T-H diagrams of manganites with colossal negative magnetoresistance (CMR).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Irreversibility and anisotropy of the low-temperature magnetization in manganites. Spin-glass polyamorphism

Sirenko

Eremenko

2014

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

The temperature dependences of the magnetization in manganites of different composition and structural morphology were measured in two cooling regimes, field cooling (FC) and zero-field cooling (ZFC), for two different orientations of a magnetic field, parallel and perpendicular to the c-axis. The following general tendencies were found: (1) The difference between the magnetizations M FC and M ZFC at T ¼ 5 K increases with increasing magnetic field, reaching the maximum value in a magnetic field of about 2 kOe, and then drops in the range 2-5 kOe; (2) The field dependence of the "splitting" temperature T * below which the difference between the magnetizations M FC and M ZFC appears can be reasonably well described by a power law with the exponent 2/3 as predicted by the theory of spin glasses. Both results are characteristic for single crystals, as well as for ceramics and films. On the other hand, the field dependence of the anisotropy of magnetic susceptibility is different for samples with different degrees of magnetic ordering (H/T C ). These results are consistent with the detected in the present study universality of the line separating the low-temperature region of irreversibility in the H-T phase diagram of manganites. Deviations from the T * -H-line with the exponent 2/3 in strong magnetic fields, which are commonly associated with the appearance of the magnetization component transverse to the magnetic field, are typical for samples containing the antiferromagnetic phase. The interpretation takes into account the multi-phase nature of the systems, i.e., coexistence of spin glass with ferromagnetism and antiferromagnetism. The observed change in the anisotropy of magnetic susceptibility with increasing magnetic field and the behavior of magnetic and thermomagnetic irreversibility are regarded as a manifestation of the spin-reorientation phase transition in an antiferromagnetic environment. This in turn initiates the transformation of the spin-glass-from the Ising-to the Heisenberg-type-which leads to the change in the exponent in the T * -H diagram from 2/3 to 2. The observed phenomenon is universal-it was observed in manganites of different composition and structural morphology-and represents a particular type of polyamorphism, namely, spin-glass polyamorphism. V C 2014 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4865567] Low Temp. Phys. 40 (2), February

show abstract

Section: Resultssupporting

confidence: 83%

“…It also contains the references from which the data were obtained. 17,[20][21][22]38,40,[43][44][45] It should be noted that Fig. 5 (as well as Fig.…”

Section: Resultsmentioning

confidence: 85%