2015 Fiscal Year Final Research Report
Theory of competing hybridization effect and magnetic and multipole states in the rare-earth compounds
| Project/Area Number |
25400362
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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 the Ryukyus (2015)
Niigata University (2013-2014) |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 軌道自由度 / 混成 / 希土類 / 相転移 / 磁性 / 電荷 / 磁場 / 結晶場 |
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| Outline of Final Research Achievements |
This project was designed for investigating the frustrated ordered states that originate from the mixing between conduction and f electrons. Through the course of this study, we have discovered that a spin-charge composite ordered phase is stabilized in an effective Hamiltonian derived from the pf mixing for Sm-ions. This state is found to explain a number of anomalous low-temperature properties of SmRu4P12 which have been known as long-standing puzzles. We have also clarified the global structure of the phase diagram under the strong competition between spin and charge interactions. The proposed ordered state was then identified by a synchrotron-radiation X-ray diffraction experiment by Matsumura et al.. We have further investigated the transport properties of the ordered phase and found a realization of the half-metallic state due to an interference of the two order parameters. A reasonable interpretation of recent transport measurements was given on the basis of this theory.
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| Free Research Field |
物性理論
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