@ARTICLE{Kurbakov2005,
author={Kurbakov, A.I. and Lazuta, A.V. and Ryzhov, V.A. and Trounov, V.A. and Larionov, I.I. and Martin, C. and Maignan, A. and Hervieu, M.},
title={Crystal structure and magnetic and transport properties of Sm0.5154Sr0.5MnO3: A-type antiferromagnetic phase and ferromagnetic polarons},
journal={Physical Review B - Condensed Matter and Materials Physics},
year={2005},
volume={72},
number={18},
doi={10.1103/PhysRevB.72.184432},
art_number={184432},
note={cited By 27},
url={https://www.scopus.com/inward/record.uri?eid=2-s2.0-29644445737&doi=10.1103%2fPhysRevB.72.184432&partnerID=40&md5=40a7f9806cb5918b8fb488391b39671a},
affiliation={Petersburg Nuclear Physics Institute RAS, Gatchina, St. Petersburg 188300, Russian Federation; Laboratoire CRISMAT, UMR 6508 ISMRA, Universite de Caen, Boulevard de Marechal Juin, 14050 Caen, France},
abstract={Structural investigations (neutron diffraction and electron microscopy), as well as data on resistance, magnetization, and second harmonic of magnetization, are presented for Sm0.5154Sr0.5MnO3 manganite. The neutron diffraction studies reveal a structural phase transition at Tst≈135K from a high-temperature Pbnm space group to a mixture of two Pbnm phases, which are coherently coupled by atomic positions but differ in cell parameters. Above Tst, this compound is a paramagnetic insulator. At room temperature, a strained and complex nanostructure state is observed in the high-resolution electron microscopy images. In the Pbnm structure it is generated by the coexistence of twinning domains and a small deviation from orthorhombicity for a monoclinic structure. Below Tst, both structural phases begin to exhibit coherent Jahn-Teller distortions, which are different in the two phases. The structural transition is accompanied by the development of a magnetic ordering, so that the ground state is a mixture of ferromagnetism (F) and A-type antiferromagnetism (AF-A). The AF-A order develops in the new low-temperature structural phase II, whereas the F moment is related to the high-temperature structure I. The several variants of the magnetic ordering are considered for phase I. A more physically justified scenario is that this phase does not possess an AF-A component and exhibits F ordering with an F moment of 1.9(1)μB Mn at 1.5K. In this case, the AF moment of phase II is found to be 4.1(1)μB Mn at 1.5K. This unexpected result is attributed to the formation of ferromagnetic polarons in connection with a new electronic structure proposed for the AF-A state. A metalliclike behavior is only observed below 50K and is related to the F phase. The AF-A phase is expected to be insulating. It can exhibit a short-range charge ordering that is observed by electron diffraction at 92K. A field hysteresis of the second harmonic is found above TC∼TN≈Tst, which is associated with AF-A regions in the paramagnetic matrix which possess a weak ferromagnetism. © 2005 The American Physical Society.},
correspondence_address1={Kurbakov, A.I.; Petersburg Nuclear Physics Institute RAS, Gatchina, St. Petersburg 188300, Russian Federation},
issn={10980121},
coden={PRBMD},
language={English},
abbrev_source_title={Phys. Rev. B Condens. Matter Mater. Phys.},
document_type={Article},
source={Scopus},
}

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The neutron diffraction studies reveal a structural phase transition at Tst≈135K from a high-temperature Pbnm space group to a mixture of two Pbnm phases, which are coherently coupled by atomic positions but differ in cell parameters. Above Tst, this compound is a paramagnetic insulator. At room temperature, a strained and complex nanostructure state is observed in the high-resolution electron microscopy images. In the Pbnm structure it is generated by the coexistence of twinning domains and a small deviation from orthorhombicity for a monoclinic structure. Below Tst, both structural phases begin to exhibit coherent Jahn-Teller distortions, which are different in the two phases. The structural transition is accompanied by the development of a magnetic ordering, so that the ground state is a mixture of ferromagnetism (F) and A-type antiferromagnetism (AF-A). The AF-A order develops in the new low-temperature structural phase II, whereas the F moment is related to the high-temperature structure I. The several variants of the magnetic ordering are considered for phase I. A more physically justified scenario is that this phase does not possess an AF-A component and exhibits F ordering with an F moment of 1.9(1)μB Mn at 1.5K. In this case, the AF moment of phase II is found to be 4.1(1)μB Mn at 1.5K. This unexpected result is attributed to the formation of ferromagnetic polarons in connection with a new electronic structure proposed for the AF-A state. A metalliclike behavior is only observed below 50K and is related to the F phase. The AF-A phase is expected to be insulating. It can exhibit a short-range charge ordering that is observed by electron diffraction at 92K. A field hysteresis of the second harmonic is found above TC∼TN≈Tst, which is associated with AF-A regions in the paramagnetic matrix which possess a weak ferromagnetism. © 2005 The American Physical Society.","correspondence_address1":"Kurbakov, A.I.; Petersburg Nuclear Physics Institute RAS, Gatchina, St. Petersburg 188300, Russian Federation","issn":"10980121","coden":"PRBMD","language":"English","abbrev_source_title":"Phys. Rev. B Condens. Matter Mater. 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The neutron diffraction studies reveal a structural phase transition at Tst≈135K from a high-temperature Pbnm space group to a mixture of two Pbnm phases, which are coherently coupled by atomic positions but differ in cell parameters. Above Tst, this compound is a paramagnetic insulator. At room temperature, a strained and complex nanostructure state is observed in the high-resolution electron microscopy images. In the Pbnm structure it is generated by the coexistence of twinning domains and a small deviation from orthorhombicity for a monoclinic structure. Below Tst, both structural phases begin to exhibit coherent Jahn-Teller distortions, which are different in the two phases. The structural transition is accompanied by the development of a magnetic ordering, so that the ground state is a mixture of ferromagnetism (F) and A-type antiferromagnetism (AF-A). The AF-A order develops in the new low-temperature structural phase II, whereas the F moment is related to the high-temperature structure I. The several variants of the magnetic ordering are considered for phase I. A more physically justified scenario is that this phase does not possess an AF-A component and exhibits F ordering with an F moment of 1.9(1)μB Mn at 1.5K. In this case, the AF moment of phase II is found to be 4.1(1)μB Mn at 1.5K. This unexpected result is attributed to the formation of ferromagnetic polarons in connection with a new electronic structure proposed for the AF-A state. A metalliclike behavior is only observed below 50K and is related to the F phase. The AF-A phase is expected to be insulating. It can exhibit a short-range charge ordering that is observed by electron diffraction at 92K. 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