|
1
|
Okubo S, Ohta H, Ijima T, Yamasaki T, Zhang W, Hara S, Ikeda S, Oshima H, Takahashi M, Tomiyasu K, Watanabe T. THz ESR study of Spinel Compound GeCo2O4. Z PHYS CHEM 2016. [DOI: 10.1515/zpch-2016-0841] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
We performed terahertz ESR measurements of spin frustrated spinel compound GeCo2O4 using pulsed magnetic fields of up to 40 T. A very broad EPR absorption line was observed at 86 K. The g-values at 86 K were estimated to be g=5.26±0.07, 5.16±0.12 and 4.98±0.07 for B//[111], [100] and [110], respectively. High-field ESR measurements revealed complicated phase structures and a field-induced magnetic phase below 3 K. Critical fields of magnetic phases at 1.8 K for B//[111] were observed at 1.8 T, 5.0 T, 8.6 T, 11.0 T and 12.9 T for B//[111]. An energy gap of 300 GHz (=14.4 K=1.24 meV), which was related to the lattice deformation, was observed for B//[111]. The zero field gap of ω
4 mode, which is considered to be a singlet-triplet excitation of the di-tetramer, was estimated to be 1120 GHz.
Collapse
Affiliation(s)
- Susumu Okubo
- Molecular Photoscience Research Center, Kobe University, Rokkodai 1-1, Nada, 657-8501, Japan
| | - Hitoshi Ohta
- Molecular Photoscience Research Center, Kobe University, Rokkodai 1-1, Nada, 657-8501, Japan , Tel.: +81-78-8035654
| | - Tatsuya Ijima
- Graduate School of Science, Kobe University, Rokkodai 1-1, Nada, 657-8501, Japan
| | - Tatsuya Yamasaki
- Graduate School of Science, Kobe University, Rokkodai 1-1, Nada, 657-8501, Japan
| | - Weimin Zhang
- Molecular Photoscience Research Center, Kobe University, Rokkodai 1-1, Nada, 657-8501, Japan
| | - Shigeo Hara
- Department of Physics, Chuo Univeristy, Kasuga 1-13-27, Tokyo, 112-8551, Japan
| | - Shinichi Ikeda
- National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1, Tsukuba, 305-8568, Japan
| | - Hiroyuki Oshima
- Institute of Material Science, University of Tsukuba, Tennoudai 1-1, Tsukuba, 305-8577, Japan
| | - Miwako Takahashi
- Institute of Material Science, University of Tsukuba, Tennoudai 1-1, Tsukuba, 305-8577, Japan
| | - Keisuke Tomiyasu
- Department of Physics, Tohoku University, Aramaki aza aoba 6-3, Sendai, 980-8578, Japan
| | - Tadataka Watanabe
- Department of Physics, College of Science and Technology, Nihon University, Kanda surugadai 1-8, Tokyo, 101-8308, Japan
| |
Collapse
|
|
2
|
Aravindan V, Chuiling W, Madhavi S. High power lithium-ion hybrid electrochemical capacitors using spinel LiCrTiO4 as insertion electrode. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32970k] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|