ID | 74517 |
Title Transcription | キソク コウシ マンガン サンカブツ ノ ソウブンリ オヨビ スピン デンカ キドウ セイレツ ノ カクジキ キョウメイ オヨビ μSR ニヨル ケンキュウ
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Title Alternative | NMR and μSR Studies of Phase Separation, Spin, Charge and Orbital Ordering in A-Site Ordered Manganese Oxides
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Author |
Ohno, Takashi
Department of Quantum Materials Science, Institute of Technology and Science, The University of Tokushima
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Kawasaki, Yu
Department of Quantum Materials Science, Institute of Technology and Science, The University of Tokushima
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Kishimoto, Yutaka
Department of Quantum Materials Science, Institute of Technology and Science, The University of Tokushima
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Keywords | A-site ordered manganese oxides
YBaMn2O6
LaBaMn2O6
phase separation
ferromagnetic phase
antiferromagnetic phase
NMR
μSR
spectrum
spin-spin relaxation
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Content Type |
Departmental Bulletin Paper
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Description | Nuclear magnetic resonance and μSR measurements have been made to study the phase separation,
spin, charge and orbital ordering in A-site ordered manganese oxides. In the antiferromagnetic YBaMn2O6, the magnetic moments of Mn4+ and Mn3+ ions are estimated to be 3.0 μB and 3.6 μB from the observed NMR spectra at 295 MHz and 320 MHz, respectively, which agree with the expected spins S=3/2 and S=2 of Mn4+ and Mn3+ ions, respectively. In the μSR experimental results in YBaMn2O6, the intensity of positrons shows the typical time decay of a single exponential function in the paramagnetic phase and the oscillation in the antiferromagnetic phase, which indicates that the antiferromagnetic phase in YBaMn2O6 is similar to the ordinary antiferromagnetic phase. 55Mn NMR spectra in LaBaMn2O6 at low temperature consists of the signals from both ferromagnetic and antiferromagnetic phases, which gives the evidence for the coexistence of the ferromagnetic and antiferromagnetic phases in the ground state in LaBaMn2O6 from the microscopic point of view. In the μSR experimental results in LaBaMn2O6, the intensity of positrons shows the typical time decay of a single exponential function in the paramagnetic phase but still shows no oscillation in the ferromagnetic phase, which indicates that the ferromagnetic phase in LaBaMn2O6 is very different from the ordinary ferromagnetic phase. On the contrary, in the coexisting antiferromagnetic phase in the ground state the intensity of positrons shows the typical time decay of oscillation due to the internal field, which indicates that the coexisting antiferromagnetic phase in LaBaMn2O6 is similar to the ordinary antiferromagnetic phase. These results may be concerned with the fact that the antiferromagnetic phase is created in the ferromagnetic phase. |
Journal Title |
徳島大学大学院ソシオテクノサイエンス研究部研究報告
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ISSN | 21859094
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NCID | AA12214889
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Volume | 54
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Start Page | 17
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End Page | 23
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Sort Key | 17
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Published Date | 2009
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FullText File | |
language |
jpn
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departments |
Science and Technology
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