TY - JOUR
T1 - High field magnetism of the spinel oxide CoAl 2O 4
AU - Hagiwara, M.
AU - Kimura, S.
AU - Nishihagi, N.
AU - Suzuki, T.
AU - Nohara, M.
AU - Takagi, H.
AU - Kindo, K.
N1 - Funding Information:
Acknowledgements This work was supported in part by Grants-in-Aid for Scientific Research (B) (No. 20340089) and for Scientific Research on Priority Areas “High Magnetic Field Spin Science in 100 Tesla” (No. 451), and by Global COE Program (Core Research and Engineering of Advanced Materials-Interdisciplinary Education Center for Materials Science) from MEXT, Japan.
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2010/4
Y1 - 2010/4
N2 - We report the results of magnetization and electron spin resonance (ESR) measurements on sintered samples of the spinel oxide CoAl 2O 4 in magnetic fields up to 53 T. In CoAl 2O 4, Co 2+ (S=3/2) ions make a diamond lattice, indicating naively that no geometrical frustration takes place. This spinel oxide, however, is thought to be in the vicinity of a quantum melting point of the antiferromagnetically ordered state because of no sharp peak in the temperature dependence of specific heat. Magnetization curve at 4.2 K is almost linear in magnetic fields and a broad ESR signal was observed on a straight resonance line with g=2.26, implying an antiferromagnetic long range order or a well developed antiferromagnetic short range order with very small anisotropy.
AB - We report the results of magnetization and electron spin resonance (ESR) measurements on sintered samples of the spinel oxide CoAl 2O 4 in magnetic fields up to 53 T. In CoAl 2O 4, Co 2+ (S=3/2) ions make a diamond lattice, indicating naively that no geometrical frustration takes place. This spinel oxide, however, is thought to be in the vicinity of a quantum melting point of the antiferromagnetically ordered state because of no sharp peak in the temperature dependence of specific heat. Magnetization curve at 4.2 K is almost linear in magnetic fields and a broad ESR signal was observed on a straight resonance line with g=2.26, implying an antiferromagnetic long range order or a well developed antiferromagnetic short range order with very small anisotropy.
KW - ESR
KW - Geometrical frustration
KW - High field magnetism
KW - Magnetization
KW - Spinel oxides
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U2 - 10.1007/s10909-009-0081-y
DO - 10.1007/s10909-009-0081-y
M3 - Article
AN - SCOPUS:77950369835
SN - 0022-2291
VL - 159
SP - 11
EP - 14
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
IS - 1-2
ER -