2014 Fiscal Year Final Research Report
Low-temperature high-sensitivity magnetization measurements on tiny single crystals of quantum magnet systems
| Project/Area Number |
24340075
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial 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 | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
MITAMURA Hiroyuki 東京大学, 物性研究所, 助教 (60282604)
KITTAKA Shunichiro 東京大学, 物性研究所, 助教 (80579805)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 量子スピン系 / 強相関電子系 / 量子相転移 / 超伝導 / 磁化測定 / 極低温 |
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| Outline of Final Research Achievements |
Low-dimensional quantum spin systems and strongly correlated electron systems can quite often be obtained only as tiny single-crystalline samples. In this project, sensitivity of the low-temperature magnetometer, which the present principal investigator has been developed, is improved by a factor of 100 to be able to measure those tiny crystals. Some selected achievements: (1) Field and temperature variations of the magnetization of a spin 1/2 one dimensional Heisenberg antiferromagnet CuPzN are confirmed to precisely follow the predictions of the exact solutions. (2) Magnetization of a high-quality single crystal of Sr2RuO4 in a magnetic field applied exactly parallel to the c plane exhibits a sharp magnetization jump at the upper critical field at low temperatures, evidencing a first-order superconducting-normal transition. The results provide an important clue for elucidating its pairing symmetry.
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| Free Research Field |
固体物理学
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