TY - JOUR
T1 - Electronic states and possible origin of the orbital-glass state in a nearly metallic spinel cobalt vanadate
T2 - An x-ray magnetic circular dichroism study
AU - Nonaka, Yosuke
AU - Shibata, Goro
AU - Koborinai, Rui
AU - Ishigami, Keisuke
AU - Sakamoto, Shoya
AU - Ikeda, Keisuke
AU - Chi, Zhendong
AU - Koide, Tsuneharu
AU - Tanaka, Arata
AU - Katsufuji, Takuro
AU - Fujimori, Atsushi
N1 - Funding Information:
Enlightening discussion with Tanusri Saha-Dasgupta and Kartik Samanta is gratefully acknowledged. We would like to thank Kenta Amemiya and Masako Sakamaki for valuable technical support at KEK-PF. We also thank Masaki Kobayashi for fruitful discussion. This work was supported by a Grant-in-Aid for Scientific Research from JSPS (22224005, 15H02109, 15K17696, 16H04020). The experiment was done under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2013S2-004, 2016G066, 2016S2-005). S.S. acknowledges financial support from Advanced Leading Graduate Course for Photon Science (ALPS) and the JSPS Research Fellowship for Young Scientists. Z.C. acknowledges financial support from Materials Education Program for the Futures leaders in Research, Industry and Technology (MERIT). A.F. is an adjunct member of Center for Spintronics Research Network (CSRN), the University of Tokyo, under Spintronics Research Network of Japan (Spin-RNJ). Crystal structures were drawn using a vesta software [45] .
Funding Information:
Enlightening discussion with Tanusri Saha-Dasgupta and Kartik Samanta is gratefully acknowledged. We would like to thank Kenta Amemiya and Masako Sakamaki for valuable technical support at KEK-PF. We also thank Masaki Kobayashi for fruitful discussion. This work was supported by a Grant-in-Aid for Scientific Research from JSPS (22224005, 15H02109, 15K17696, 16H04020). The experiment was done under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2013S2-004, 2016G066, 2016S2-005). S.S. acknowledges financial support from Advanced Leading Graduate Course for Photon Science (ALPS) and the JSPS Research Fellowship for Young Scientists. Z.C. acknowledges financial support from Materials Education Program for the Futures leaders in Research, Industry and Technology (MERIT).
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/5/22
Y1 - 2018/5/22
N2 - We have investigated the orbital states of the orbital-glassy (short-range orbital ordered) spinel vanadate Co1.21V1.79O4 using x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD), and subsequent configuration-interaction cluster-model calculation. From the sign of the XMCD spectra, it was found that the spin magnetic moment of the Co ion is aligned parallel to the applied magnetic field and that of the V ion antiparallel to it, consistent with neutron scattering studies. It was revealed that the excess Co ions at the octahedral site take the trivalent low-spin state and induce a random potential to the V sublattice. The orbital magnetic moment of the V ion is small, suggesting that the ordered orbitals mainly consist of real-number orbitals.
AB - We have investigated the orbital states of the orbital-glassy (short-range orbital ordered) spinel vanadate Co1.21V1.79O4 using x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD), and subsequent configuration-interaction cluster-model calculation. From the sign of the XMCD spectra, it was found that the spin magnetic moment of the Co ion is aligned parallel to the applied magnetic field and that of the V ion antiparallel to it, consistent with neutron scattering studies. It was revealed that the excess Co ions at the octahedral site take the trivalent low-spin state and induce a random potential to the V sublattice. The orbital magnetic moment of the V ion is small, suggesting that the ordered orbitals mainly consist of real-number orbitals.
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U2 - 10.1103/PhysRevB.97.205126
DO - 10.1103/PhysRevB.97.205126
M3 - Article
AN - SCOPUS:85047449812
SN - 2469-9950
VL - 97
JO - Physical Review B
JF - Physical Review B
IS - 20
M1 - 205126
ER -