2012 Fiscal Year Final Research Report
Dynamics of Single Molecular Magnet 2d-networks with frustration
| Project/Area Number |
22540351
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Toho University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KACHI Chihiro 東邦大学, 理学部, 准教授 (80453851)
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| Project Period (FY) |
2010 – 2012
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| Keywords | スピンアイス / 単分子磁石ネットワーク / フラストレーション / 物性実験 / ダイナミクス |
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| Research Abstract |
In order to realize the 2D-spin ice system, we synthesized layered single molecular magnet (SMM) networks [Mn(5-Rsaltmen)]4 [M(CN)6]A・nH_2O（M=Mn, Fe, Co; R=H, Me; A = ClO_4^-, PF6^-, CF_3SO_3^-）, and measured the magnetic properties, in particular analyzing the magnetic relaxation. From the results, we found that the system with M=Mn is a strongly frustrated system, and the relaxation model is the Davidson-Cole type indicating that the system is spin ice-like. The origin of the frustration is a competition between the orthogonally oriented two uniaxial axes of the single molecular magnet unit and the ferromagnetic interaction between the SMM unit and the M complex in 2D plane. We also observed that for a disorder introduced system (M = Mn1-_xFe_x), the spin ice state of x=0 is melted for x=0.1 and ordered into a randomly frozen state for x>0.3. In addition, the relation between the structure and the magnetic properties is studied for various M, R, and A.
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