Abstract
An 57Fe Mössbauer spectroscopy has been conducted on the spinel oxide FeV2O4, where both Fe2+ and V3+ ions bear spin and orbital degrees of freedom. Distinct evidence of the orbital order in FeV2O4 was found. That is, at 65 K, where the transition from the orthorhombic phase to the lowerature tetragonal phase takes place, the sign of the quadrupole coupling constant e2qQ/2 changes abruptly from negative to positive. The change in the orbital state accompanies a sudden decrease in the hyperfine field Hhf. The small Hhf implies the presence of the orbital angular momentum L, whose value itself does not change considerably through the transition. The spin order in the Fe2+ ion was also obtained. In the ferrimagnetic state below 110 K, the Fe2+ spin aligns along the orthorhombic a-axis (the longest axis). In the canted ferrimagnetic state below 65 K, however, the Fe2+ spin seems to incline slightly from the tetragonal c-axis. The canted V3+ spin may cause the slight canting of the Fe2+ spin.
| Original language | English |
|---|---|
| Article number | 014702 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 85 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2016 Jan 15 |
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Distinct Evidence of Orbital Order in Spinel Oxide FeV2O4 by 57Fe Mössbauer Spectroscopy. / Nakamura, Shin; Fuwa, Akio.
In: Journal of the Physical Society of Japan, Vol. 85, No. 1, 014702, 15.01.2016.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Distinct Evidence of Orbital Order in Spinel Oxide FeV2O4 by 57Fe Mössbauer Spectroscopy
AU - Nakamura, Shin
AU - Fuwa, Akio
PY - 2016/1/15
Y1 - 2016/1/15
N2 - An 57Fe Mössbauer spectroscopy has been conducted on the spinel oxide FeV2O4, where both Fe2+ and V3+ ions bear spin and orbital degrees of freedom. Distinct evidence of the orbital order in FeV2O4 was found. That is, at 65 K, where the transition from the orthorhombic phase to the lowerature tetragonal phase takes place, the sign of the quadrupole coupling constant e2qQ/2 changes abruptly from negative to positive. The change in the orbital state accompanies a sudden decrease in the hyperfine field Hhf. The small Hhf implies the presence of the orbital angular momentum L, whose value itself does not change considerably through the transition. The spin order in the Fe2+ ion was also obtained. In the ferrimagnetic state below 110 K, the Fe2+ spin aligns along the orthorhombic a-axis (the longest axis). In the canted ferrimagnetic state below 65 K, however, the Fe2+ spin seems to incline slightly from the tetragonal c-axis. The canted V3+ spin may cause the slight canting of the Fe2+ spin.
AB - An 57Fe Mössbauer spectroscopy has been conducted on the spinel oxide FeV2O4, where both Fe2+ and V3+ ions bear spin and orbital degrees of freedom. Distinct evidence of the orbital order in FeV2O4 was found. That is, at 65 K, where the transition from the orthorhombic phase to the lowerature tetragonal phase takes place, the sign of the quadrupole coupling constant e2qQ/2 changes abruptly from negative to positive. The change in the orbital state accompanies a sudden decrease in the hyperfine field Hhf. The small Hhf implies the presence of the orbital angular momentum L, whose value itself does not change considerably through the transition. The spin order in the Fe2+ ion was also obtained. In the ferrimagnetic state below 110 K, the Fe2+ spin aligns along the orthorhombic a-axis (the longest axis). In the canted ferrimagnetic state below 65 K, however, the Fe2+ spin seems to incline slightly from the tetragonal c-axis. The canted V3+ spin may cause the slight canting of the Fe2+ spin.
UR - http://www.scopus.com/inward/record.url?scp=84956921031&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84956921031&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.85.014702
DO - 10.7566/JPSJ.85.014702
M3 - Article
AN - SCOPUS:84956921031
VL - 85
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 1
M1 - 014702
ER -