On the Origin of CE-Type Orbital Fluctuations in the Ferromagnetic Metallic Phase of La2-2xSr1+2xMn2O7 near x=0.4

Title
On the Origin of CE-Type Orbital Fluctuations in the Ferromagnetic Metallic Phase of La2-2xSr1+2xMn2O7 near x=0.4
Authors
Tetsuya Takimoto
Keywords
MANGANITES; MAGNETORESISTANCE; LA1.2SR1.8MN2O7; SPECTROSCOPY; SPECTRA; OXIDES; LAMNO3; FILMS
Issue Date
2015-05
Publisher
PHYSICAL SOC JAPAN
Citation
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, v. 84, no.6, Page. 1-7
Abstract
We investigate the orbital fluctuations in the ferromagnetic–metallic phase of La2−2xSr1+2xMn2O7 near x = 0.4 by considering a two orbital model within a tight-binding description which reproduces the ARPES Fermi surface. We find strong antisymmetric transverse orbital fluctuations at wavevector (0.5π,0.5π)(0.5π,0.5π) resulting from the Fermi-surface nesting between the portions of bonding and antibonding bands instead of the widely believed nesting between the portions of bonding band despite their flat segments, which provide an insight into the origin of so called CE-type orbital fluctuations in the ferromagnetic–metallic phase. Subsequent renormalization of the phonons near wavevector (0.5π,0.5π)(0.5π,0.5π) and the behavior of the phonon linewidth as a function of momentum are in agreement with the inelastic neutron scattering experiments.
URI
http://journals.jps.jp/doi/abs/10.7566/JPSJ.84.064709http://hdl.handle.net/20.500.11754/24607
ISSN
1347-4073; 0031-9015
DOI
http://dx.doi.org/10.7566/JPSJ.84.064709
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE