TY - JOUR
T1 - Orbital structures in spinel vanadates AV2O4 (A = Fe, Mn)
AU - Nii, Y.
AU - Sagayama, H.
AU - Arima, T.
AU - Aoyagi, S.
AU - Sakai, R.
AU - Maki, S.
AU - Nishibori, E.
AU - Sawa, H.
AU - Sugimoto, K.
AU - Ohsumi, H.
AU - Takata, M.
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2012/9/28
Y1 - 2012/9/28
N2 - Spinel FeV2O4 exhibits successive structural phase transitions, reflecting the interplay between the Fe2+ (3d6) and V3+ (3d2) ions, both of which have orbital and spin degrees of freedom. The temperature-dependent orbital shapes of Fe2+ and V3 + were investigated by means of single-crystal structure analysis, and were compared with those in MnV2O4, where only the V3+ ions are Jahn-Teller active. The highest-temperature transition from the cubic to the high-temperature tetragonal phase was driven by a ferroic Fe2+ 3z2-r2 orbital order (OO). At 110 K, where the ferrimagnetic transition takes place, the magnetic order modified the orbital shape through intratomic spin-orbit coupling, causing an orthorhombic distortion. The V3 + orbital order (V-OO) contributed to the lowest temperature transition from the orthorhombic to the low-temperature tetragonal phase. The V-OO in FeV2O4 was qualitatively different from that in MnV2O4. We propose that ferro-OO contains a complex orbital in FeV2O4 in contrast to the V-OO of real orbitals observed in MnV2O4.
AB - Spinel FeV2O4 exhibits successive structural phase transitions, reflecting the interplay between the Fe2+ (3d6) and V3+ (3d2) ions, both of which have orbital and spin degrees of freedom. The temperature-dependent orbital shapes of Fe2+ and V3 + were investigated by means of single-crystal structure analysis, and were compared with those in MnV2O4, where only the V3+ ions are Jahn-Teller active. The highest-temperature transition from the cubic to the high-temperature tetragonal phase was driven by a ferroic Fe2+ 3z2-r2 orbital order (OO). At 110 K, where the ferrimagnetic transition takes place, the magnetic order modified the orbital shape through intratomic spin-orbit coupling, causing an orthorhombic distortion. The V3 + orbital order (V-OO) contributed to the lowest temperature transition from the orthorhombic to the low-temperature tetragonal phase. The V-OO in FeV2O4 was qualitatively different from that in MnV2O4. We propose that ferro-OO contains a complex orbital in FeV2O4 in contrast to the V-OO of real orbitals observed in MnV2O4.
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U2 - 10.1103/PhysRevB.86.125142
DO - 10.1103/PhysRevB.86.125142
M3 - Article
AN - SCOPUS:84867012746
VL - 86
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 12
M1 - 125142
ER -