Observation of a half step magnetization in the {Cu3}-type triangular spin ring |
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Authors: | Choi Kwang-Yong Matsuda Yasuhiro H Nojiri Hiroyuki Kortz U Hussain F Stowe Ashley C Ramsey Chris Dalal Naresh S |
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Affiliation: | Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan, and CREST, Japan Science and Technology Agency, Japan. |
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Abstract: | We report pulsed field magnetization and ESR experiments on a {Cu3} nanomagnet, where antiferromagnetically coupled Cu(2+) (S = 1/2) ions form a slightly distorted triangle. The remarkable feature is the observation of a half step magnetization, hysteresis loops, and an asymmetric magnetization between a positive and a negative field in a fast sweeping external field. This is attributed to an adiabatic change of magnetization. The energy levels determined by ESR unveil that the different mixing nature of a spin chirality of a total S = 1/2 Kramers doublet by virtue of Dzyaloshinskii-Moriya interactions is decisive for inducing half step magnetization. |
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