Unusual peculiarities of paramagnet to ferromagnet phase transition in La0.88MnO2.91. Ryzhov, V.; Lazuta, A.; Kiselev, I.; Khavronin, V.; Molkanov, P.; Troaynchuk, I.; and Trukhanov, S. Journal of Magnetism and Magnetic Materials, 300(1):e159-e162, 2006. cited By 10; Conference of Third International Symposium on Magnetism 2005 ; Conference Date: 26 June 2005 Through 30 June 2005; Conference Code:66801
Unusual peculiarities of paramagnet to ferromagnet phase transition in La0.88MnO2.91 [link]Paper  doi  abstract   bibtex   
Study of the linear and nonlinear magnetic responses as well as electron spin resonance (ESR) is presented for insulating La0.88MnO 2.91 with TC≈216K. According to the data on the second harmonic of magnetization (M2), this compound exhibits an unconventional paramagnet to ferromagnet (PF) phase transition. A critical behavior of the system is found to agree with a prediction for a 3D isotropic ferromagnet in the P-region above T*≈247 K. Below T*, an anomalous phase develops whose properties differ radically from those of a magnet exhibiting an usual PF transition. This phase originates in a ferromagnetically ordered state and reveals a strong nonlinear behavior in the weak fields. The ESR data, which are obtained in the essentially higher field and frequency than those in the M 2 measurements, agree with the conventional critical behavior above 225 K, indicating a strong suppression of the anomalous response by the field. These peculiarities are close to those found in the usually doped Nd 1-xBaxMnO3 (x=0.23, 0.25) manganites. It supports an assumption on universal character of this phenomenon, namely, formation of a heterogeneous magnetic state with the coexistence of the anomalous and traditional phases. Since this compound is near a border of a metal to insulator transition, the anomalous phase is assumed to exhibit a ferromagnetic metallic state whereas the traditional one is a ferromagnetic insulator. Formation of this nontrivial state is attributed to a strong coupling of the orbital, Jahn-Teller phonons and charge degrees of freedom with the magnetic ones. © 2005 Elsevier B.V. All rights reserved.
@ARTICLE{Ryzhov2006,
author={Ryzhov, V.A. and Lazuta, A.V. and Kiselev, I.A. and Khavronin, V.P. and Molkanov, P.L. and Troaynchuk, I.O. and Trukhanov, S.V.},
title={Unusual peculiarities of paramagnet to ferromagnet phase transition in La0.88MnO2.91},
journal={Journal of Magnetism and Magnetic Materials},
year={2006},
volume={300},
number={1},
pages={e159-e162},
doi={10.1016/j.jmmm.2005.10.173},
note={cited By 10; Conference of Third International Symposium on Magnetism 2005 ; Conference Date: 26 June 2005 Through 30 June 2005;  Conference Code:66801},
url={https://www.scopus.com/inward/record.uri?eid=2-s2.0-33644651864&doi=10.1016%2fj.jmmm.2005.10.173&partnerID=40&md5=a7a47b935db064f08233dce6d369b809},
affiliation={Petersburg Nuclear Physics Institute, RAS, Gatchina, St. Petersburg, 188300, Russian Federation; Institute of Physics of Solids and Semiconductors, National Academy of Sciences, ul. P. Brovki 17, 220072, Minsk, Belarus},
abstract={Study of the linear and nonlinear magnetic responses as well as electron spin resonance (ESR) is presented for insulating La0.88MnO 2.91 with TC≈216K. According to the data on the second harmonic of magnetization (M2), this compound exhibits an unconventional paramagnet to ferromagnet (PF) phase transition. A critical behavior of the system is found to agree with a prediction for a 3D isotropic ferromagnet in the P-region above T*≈247 K. Below T*, an anomalous phase develops whose properties differ radically from those of a magnet exhibiting an usual PF transition. This phase originates in a ferromagnetically ordered state and reveals a strong nonlinear behavior in the weak fields. The ESR data, which are obtained in the essentially higher field and frequency than those in the M 2 measurements, agree with the conventional critical behavior above 225 K, indicating a strong suppression of the anomalous response by the field. These peculiarities are close to those found in the usually doped Nd 1-xBaxMnO3 (x=0.23, 0.25) manganites. It supports an assumption on universal character of this phenomenon, namely, formation of a heterogeneous magnetic state with the coexistence of the anomalous and traditional phases. Since this compound is near a border of a metal to insulator transition, the anomalous phase is assumed to exhibit a ferromagnetic metallic state whereas the traditional one is a ferromagnetic insulator. Formation of this nontrivial state is attributed to a strong coupling of the orbital, Jahn-Teller phonons and charge degrees of freedom with the magnetic ones. © 2005 Elsevier B.V. All rights reserved.},
author_keywords={Electron paramagnetic resonance;  Magnetically ordered materials;  Nonlinear response;  Phase transition},
correspondence_address1={Ryzhov, V.A.; Petersburg Nuclear Physics Institute, RAS, Gatchina, St. Petersburg, 188300, Russian Federation; email: ryzhov@omrb.pnpi.spb.ru},
editor={Perov N.},
issn={03048853},
coden={JMMMD},
language={English},
abbrev_source_title={J Magn Magn Mater},
document_type={Article},
source={Scopus},
}
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