| Project/Area Number |
23540389
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | University of Fukui |
|---|
Principal Investigator |
KIKUCHI Hikomitsu 福井大学, 工学(系)研究科(研究院), 教授 (50234191)
|
|---|
| 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)
|
|---|
| Project Period (FY) |
2011 – 2013
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
|
|---|
| 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 / 反強磁性体 / 量子スピン系 / 巨大磁気抵抗効果 / 磁性体 |
|---|
| 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.
|
