2013 Fiscal Year Final Research Report
Experiemental studies of 1D quantum magnets with competing interactions
| Project/Area Number |
23540389
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | University of Fukui |
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Principal Investigator |
KIKUCHI Hikomitsu 福井大学, 工学(系)研究科(研究院), 教授 (50234191)
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| Co-Investigator(Renkei-kenkyūsha) |
FUJII Yutaka 福井大学, 遠赤外領域開発研究センター, 准教授 (40334809)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 量子スピン磁性体 / 反強磁性 / 磁化 / スピンフラストレーション |
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| Research Abstract |
One dimensional quantum antiferromagets with competing interactions are expected to have novel magnetic properties. In this study, the diamond chain, triple-chain and zigzag chain model compounds were investigated. The magnetization curve of Cu3(A)2(OH)2(H2O)4, a diamond chain model compound, showed an anomaly related to the 1/3 magnetic plateau. We studied antlerite and szenicsite, actual compound for the triple-chain model. The magnetic phase diagram of antlerite is very complicated, while szenicsite has no long range magnetic order . Although crystal structures of both compounds are similar, their magnetic properties are quite different each other. It is suggested that a quantum phase transition could occur in the ground state of the triple-chain model as varying ratios among magnetic interactions. NaCr2O4, a zigzag chain oxide, was found to have the colossal magnetic resistance (CMR) effect. The mechanism of the CMR effect was discussed in terms of the spin frustration effect.
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