Pressure-dependent electronic structures in multiferroic DyMnO(3): A combined lifetime-broadening-suppressed x-ray absorption spectroscopy and ab initio electronic structure study.
Variations in the electronic structure and structural distortion in multiferroic DyMnO(3) were probed by synchrotron x-ray diffraction, lifetime-broadening-suppressed x-ray absorption spectroscopy (XAS), and ab initio electronic structure calculations. The refined x-ray diffraction data enabled an observation of a diminished local Jahn-Teller distortion of Mn sites within MnO(6) octahedra in DyMnO(3) on applying the hydrostatic pressure. The intensity of the white line in Mn K-edge x-ray absorption spectra of DyMnO(3) progressively increased with the increasing pressure. With the increasing hydrostatic pressure, the absorption threshold of an Mn K-edge spectra of DyMnO(3) shifted toward a greater energy, whereas the pre-edge line slightly shifted to a smaller energy. We provide the spectral evidence for the pressure-induced bandwidth broadening for manganites. The intensity enhancement of the white line in Mn K-edge spectra is attributed to a diminished Jahn-Teller distortion of MnO(6) octahedra in compressed DyMnO(3). A comparison of the pressure-dependent XAS spectra with the ab initio electronic structure calculations and full calculations of multiple scattering using the code FDMNES shows the satisfactory agreement between experimental and calculated Mn K-edge spectra.
Chen
J M
JM
National Synchrotron Radiation Research Center (NSRRC), Hsinchu 30076, Taiwan, Republic of China. jmchen@nsrrc.org.tw
Lee
J M
JM
Chou
T L
TL
Chen
S A
SA
Huang
S W
SW
Jeng
H T
HT
Lu
K T
KT
Chen
T H
TH
Liang
Y C
YC
Chen
S W
SW
Chuang
W T
WT
Sheu
H-S
HS
Hiraoka
N
N
Ishii
H
H
Tsuei
K D
KD
Huang
Eugene
E
Lin
C M
CM
Yang
T J
TJ