Abstract
57 Fe Mössbauer spectroscopy in an applied magnetic field has been conducted on single crystals of CuFeO2 and CuFe 0.965Ga0.035O2 in order to investigate magnetic-field-induced ferroelectric states. The Mössbauer spectra observed under a magnetic field change significantly, corresponding to magnetic- field-induced phase transitions. In the ferroelectric incommensurate (FEIC) phase (7 < Hex < 13 T), the spectrum can be explained by a model with spins distributed at approximately 20, 95, and 160° from the c-axis in the (110) plane. This spin configuration resembles the "complex noncollinear spin configuration (CNC) " model proposed theoretically. In the FEIC phase, the isomer shift is larger, while the quadrupole splitting and average hyperfine field are smaller than those in the collinear four sublattice (4SL, 0 < Hex < 7 T) and five sublattice (5SL, H ex > 13 T) phases. In addition, a noticeable change in the hyperfine field is observed with varying magnetic fi eld. We consider that these changes indicate the change in the electronic state of the Fe3+ ion, possibly modified by a spin-orbit interaction.
| Original language | English |
|---|---|
| Article number | 024719 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 84 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2015 Feb 15 |
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Mössbauer spectroscopy of the magnetic-field-induced ferroelectric phase of CuFeO2 . / Nakamura, Shin; Kobayashi, Yasuhiro; Kitao, Shinji; Seto, Makoto; Fuwa, Akio; Terada, Noriki.
In: Journal of the Physical Society of Japan, Vol. 84, No. 2, 024719, 15.02.2015.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mössbauer spectroscopy of the magnetic-field-induced ferroelectric phase of CuFeO2
AU - Nakamura, Shin
AU - Kobayashi, Yasuhiro
AU - Kitao, Shinji
AU - Seto, Makoto
AU - Fuwa, Akio
AU - Terada, Noriki
PY - 2015/2/15
Y1 - 2015/2/15
N2 - 57 Fe Mössbauer spectroscopy in an applied magnetic field has been conducted on single crystals of CuFeO2 and CuFe 0.965Ga0.035O2 in order to investigate magnetic-field-induced ferroelectric states. The Mössbauer spectra observed under a magnetic field change significantly, corresponding to magnetic- field-induced phase transitions. In the ferroelectric incommensurate (FEIC) phase (7 < Hex < 13 T), the spectrum can be explained by a model with spins distributed at approximately 20, 95, and 160° from the c-axis in the (110) plane. This spin configuration resembles the "complex noncollinear spin configuration (CNC) " model proposed theoretically. In the FEIC phase, the isomer shift is larger, while the quadrupole splitting and average hyperfine field are smaller than those in the collinear four sublattice (4SL, 0 < Hex < 7 T) and five sublattice (5SL, H ex > 13 T) phases. In addition, a noticeable change in the hyperfine field is observed with varying magnetic fi eld. We consider that these changes indicate the change in the electronic state of the Fe3+ ion, possibly modified by a spin-orbit interaction.
AB - 57 Fe Mössbauer spectroscopy in an applied magnetic field has been conducted on single crystals of CuFeO2 and CuFe 0.965Ga0.035O2 in order to investigate magnetic-field-induced ferroelectric states. The Mössbauer spectra observed under a magnetic field change significantly, corresponding to magnetic- field-induced phase transitions. In the ferroelectric incommensurate (FEIC) phase (7 < Hex < 13 T), the spectrum can be explained by a model with spins distributed at approximately 20, 95, and 160° from the c-axis in the (110) plane. This spin configuration resembles the "complex noncollinear spin configuration (CNC) " model proposed theoretically. In the FEIC phase, the isomer shift is larger, while the quadrupole splitting and average hyperfine field are smaller than those in the collinear four sublattice (4SL, 0 < Hex < 7 T) and five sublattice (5SL, H ex > 13 T) phases. In addition, a noticeable change in the hyperfine field is observed with varying magnetic fi eld. We consider that these changes indicate the change in the electronic state of the Fe3+ ion, possibly modified by a spin-orbit interaction.
UR - http://www.scopus.com/inward/record.url?scp=84924939603&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84924939603&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.84.024719
DO - 10.7566/JPSJ.84.024719
M3 - Article
AN - SCOPUS:84924939603
VL - 84
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 2
M1 - 024719
ER -