Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites

Results of structural neutron diffraction study, nonlinear magnetic response and magnetic resonance measurements are presented for insulating La₀.₈₈MnO₂.₉₁ with Tc ≈ 216 K. The diffraction data are considered using the monoclinic P2/a and orthorhombic Pbnm space groups in a temperature range 4-300 K...

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Datum:2008
Hauptverfasser: Lazuta, A.V., Ryzhov, V.A., Kiselev, I.A., Chernenkov, Yu.P., Smirnov, O.P., Molkanov, P.L., Troyanchuk, I.O., Khomchenko, V.A.
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Veröffentlicht: НТК «Інститут монокристалів» НАН України 2008
Schriftenreihe:Functional Materials
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Online Zugang:http://dspace.nbuv.gov.ua/handle/123456789/134554
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Zitieren:Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites // A.V. Lazuta, V.A. Ryzhov, I.A. Kiselev, Yu.P. Chernenkov, O.P. Smirnov, P.L. Molkanov, I.O. Troyanchuk, V.A. Khomchenko // Functional Materials. — 2008. — Т. 15, № 2. — С. 178-186. — Бібліогр.: 9 назв. — англ.

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spelling irk-123456789-1345542018-06-14T03:05:45Z Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites Lazuta, A.V. Ryzhov, V.A. Kiselev, I.A. Chernenkov, Yu.P. Smirnov, O.P. Molkanov, P.L. Troyanchuk, I.O. Khomchenko, V.A. Characterization and properties Results of structural neutron diffraction study, nonlinear magnetic response and magnetic resonance measurements are presented for insulating La₀.₈₈MnO₂.₉₁ with Tc ≈ 216 K. The diffraction data are considered using the monoclinic P2/a and orthorhombic Pbnm space groups in a temperature range 4-300 K. The compound has been found to have the monoclinic structure at 300 K and orthorhombic one at 4 K. In the intermediate temperature range, these t\vo phases coexist. According to the data on nonlinear response and magnetic resonance, this compound exhibits an unconventional paramagnetic (P) to ferromagnetic (F) phase transition. Below T* ≈ 247 K, the usual P phase is transformed into a mixed state which is characterized by the appearance of the F regions in the P matrix. The temperature evolution of this state is very close to that found in the traditionally doped Nd₁₋ₓBaₓMnO₃ (x = 0.23, 0.25) manganites. This supports the supposition on universal character of this phenomenon, namely, formation of an inhomogeneous magnetic state above Tc with the coexistence of the P and F regions. The F domains are expected to exhibit a metallic state while the P phase is an insulator. Представлено результати структурних нейтронно-дифракційних досліджень, вимірювань нелінійного відгуку та магнітного резонансу для ізолятора La₀.₈₈MnO₂.₉₁ з Tc ≈ 216 K. Аналіз дифракційних даних виконано із застосуванням моноклінної та орторомбічної просторових груп у температурній області 4-300 К. Виявлено, що сполука має моноклінну структуру при 300 К та орторомбічну при 4 К. Згідно з даними про нелінійний відгук та магнітний резонанс, манганіт зазнає нетрадиційного фазового переходу парамагнетик (П) - феромагнетик (Ф). Нижче T* ≈ 247 К звичайна П фаза трансформується у змішаний стан, який характеризується появою Ф областей у П матриці. Температурна еволюція цього стану є близькою до еволюції, виявленої у традиційно допованих манганітах Nd₁₋ₓBaₓMnO₃ (х = 0,23, 0,25). Ця відповідність підтверджує припущення про універсальний характер магнітного стану вище Т с зі співіснуванням П та Ф областей. Очікується, що Ф домени перебувають у металічному стані, в той час як П фаза є ізолятором. Результаты структурных нейтрон-дифракционных исследований, измерений нелинейного отклика и магнитного резонанса представлены для изолятора La₀.₈₈MnO₂.₉₁ c Tc ≈ 216 K. Анализ дифракционных данных выполнен с использованием моноклинной и орторомбической пространственных групп в температурной области 4-300 К. Обнаружено, что соединение имеет моноклинную структуру при 300 К и орторомбическую при 4 К. Согласно данным нелинейного отклика и магнитного резонанса, манганит испытывает нетрадиционный парамагнетик (П) - ферромагнетик (Ф) фазовый переход. Ниже T* ≈ 247 К обычная П фаза трансформируется в смешанное состояние, которое характеризуется появлением Ф областей в П матрице. Температурная эволюция этого состояния близка к эволюции, обнаруженной в манганитах Nd₁₋ₓBaₓMnO₃ (х = 0,23, 0,25) с традиционным допированием. Данное соответствие поддерживает предположение об универсальном характере формирования неоднородного магнитного состояния выше Т с с сосуществованием П и Ф областей. Ожидается, что Ф домены находятся в металлическом состоянии, тогда как П фаза является изолятором. 2008 Article Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites // A.V. Lazuta, V.A. Ryzhov, I.A. Kiselev, Yu.P. Chernenkov, O.P. Smirnov, P.L. Molkanov, I.O. Troyanchuk, V.A. Khomchenko // Functional Materials. — 2008. — Т. 15, № 2. — С. 178-186. — Бібліогр.: 9 назв. — англ. 1027-5495 http://dspace.nbuv.gov.ua/handle/123456789/134554 en Functional Materials НТК «Інститут монокристалів» НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Characterization and properties
Characterization and properties
spellingShingle Characterization and properties
Characterization and properties
Lazuta, A.V.
Ryzhov, V.A.
Kiselev, I.A.
Chernenkov, Yu.P.
Smirnov, O.P.
Molkanov, P.L.
Troyanchuk, I.O.
Khomchenko, V.A.
Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites
Functional Materials
description Results of structural neutron diffraction study, nonlinear magnetic response and magnetic resonance measurements are presented for insulating La₀.₈₈MnO₂.₉₁ with Tc ≈ 216 K. The diffraction data are considered using the monoclinic P2/a and orthorhombic Pbnm space groups in a temperature range 4-300 K. The compound has been found to have the monoclinic structure at 300 K and orthorhombic one at 4 K. In the intermediate temperature range, these t\vo phases coexist. According to the data on nonlinear response and magnetic resonance, this compound exhibits an unconventional paramagnetic (P) to ferromagnetic (F) phase transition. Below T* ≈ 247 K, the usual P phase is transformed into a mixed state which is characterized by the appearance of the F regions in the P matrix. The temperature evolution of this state is very close to that found in the traditionally doped Nd₁₋ₓBaₓMnO₃ (x = 0.23, 0.25) manganites. This supports the supposition on universal character of this phenomenon, namely, formation of an inhomogeneous magnetic state above Tc with the coexistence of the P and F regions. The F domains are expected to exhibit a metallic state while the P phase is an insulator.
format Article
author Lazuta, A.V.
Ryzhov, V.A.
Kiselev, I.A.
Chernenkov, Yu.P.
Smirnov, O.P.
Molkanov, P.L.
Troyanchuk, I.O.
Khomchenko, V.A.
author_facet Lazuta, A.V.
Ryzhov, V.A.
Kiselev, I.A.
Chernenkov, Yu.P.
Smirnov, O.P.
Molkanov, P.L.
Troyanchuk, I.O.
Khomchenko, V.A.
author_sort Lazuta, A.V.
title Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites
title_short Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites
title_full Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites
title_fullStr Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites
title_full_unstemmed Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites
title_sort unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites
publisher НТК «Інститут монокристалів» НАН України
publishDate 2008
topic_facet Characterization and properties
url http://dspace.nbuv.gov.ua/handle/123456789/134554
citation_txt Unusual paramagnet to ferromagnet phase transition and magnetic inhomogeneities in hole doped manganites // A.V. Lazuta, V.A. Ryzhov, I.A. Kiselev, Yu.P. Chernenkov, O.P. Smirnov, P.L. Molkanov, I.O. Troyanchuk, V.A. Khomchenko // Functional Materials. — 2008. — Т. 15, № 2. — С. 178-186. — Бібліогр.: 9 назв. — англ.
series Functional Materials
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AT ryzhovva unusualparamagnettoferromagnetphasetransitionandmagneticinhomogeneitiesinholedopedmanganites
AT kiselevia unusualparamagnettoferromagnetphasetransitionandmagneticinhomogeneitiesinholedopedmanganites
AT chernenkovyup unusualparamagnettoferromagnetphasetransitionandmagneticinhomogeneitiesinholedopedmanganites
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first_indexed 2025-07-09T21:39:58Z
last_indexed 2025-07-09T21:39:58Z
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