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
Title Alternative
NMR and μSR Studies of Phase Separation, Spin, Charge and Orbital Ordering in A-Site Ordered Manganese Oxides
Author
Ohno, Takashi Department of Quantum Materials Science, Institute of Technology and Science, The University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Kawasaki, Yu Department of Quantum Materials Science, Institute of Technology and Science, The University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Kishimoto, Yutaka Department of Quantum Materials Science, Institute of Technology and Science, The University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Keywords
A-site ordered manganese oxides
YBaMn2O6
LaBaMn2O6
phase separation
ferromagnetic phase
antiferromagnetic phase
NMR
μSR
spectrum
spin-spin relaxation
Content Type
Departmental Bulletin Paper
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
ISSN
21859094
NCID
AA12214889
Volume
54
Start Page
17
End Page
23
Sort Key
17
Published Date
2009
FullText File
language
jpn
departments
Science and Technology