Magnetic Relaxation Study on Single Crystals of Ni-4 Single-Molecule Magnets

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	Magnetic Relaxation Study on Single Crystals of Ni-4 Single-Molecule Magnets
	Li, YR ; Liu, HQ ; Liu, Y ; Su, SK ; Wang, YP
刊名	CHINESE PHYSICS LETTERS
	2009
卷号	26 期号:7
ISSN号	0256-307X
通讯作者	Li, YR: Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	The ac susceptibility of single crystals of Ni-4 single-molecule magnets is measured by a compensation measurement setup. The magnetic relaxation time calculated from the peak of the out-phase component of the susceptibility fits the Arrhenius law well and gives an effective spin-flipping energy barrier of U-eff = 7.2 K. This value is far below the classical activation energy barrier of.. = 14 K, whereas it is close to the energy gap between the S-z - +/- 4 and S-z - +/- 3 doublets, which indicates that quantum tunneling between the S-z - 3 and S-z - -3 states plays a key role in the magnetic relaxation. Therefore the relaxation process combines thermal activation and quantum tunneling. Also we deduce that the blocking temperature of Ni-4 single-molecule magnets is lower than 0.3 K by extrapolating the relaxation time plot, which ensures that this single-molecule magnet material enters a long-range magnetic ordered state instead of a spin glass state at 0.91 K.
收录类别	SCI
资助信息	National Basic Research Program of China; Chinese Academy of Sciences
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/41415]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Li, YR,Liu, HQ,Liu, Y,et al. Magnetic Relaxation Study on Single Crystals of Ni-4 Single-Molecule Magnets[J]. CHINESE PHYSICS LETTERS,2009,26(7).
APA	Li, YR,Liu, HQ,Liu, Y,Su, SK,&Wang, YP.(2009).Magnetic Relaxation Study on Single Crystals of Ni-4 Single-Molecule Magnets.CHINESE PHYSICS LETTERS,26(7).
MLA	Li, YR,et al."Magnetic Relaxation Study on Single Crystals of Ni-4 Single-Molecule Magnets".CHINESE PHYSICS LETTERS 26.7(2009).