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Isotope substitution effects on spin dynamics of the molecular nanomagnet Fe8 cluster studied by NMR
Institution:1. Division of Physics, Graduate School of Sciences, Hokkaido University, Sapporo 060-0810, Japan;2. Department of Physics and Astronomy, Iowa State University and Ames Laboratory, Ames, IA 50011, USA;3. Dipartimento di Fisica ‘A.Volta’ e Unita’ INFM di Pavia, 27100 Pavia, Italy;1. Department of Chemistry, University of Kalyani, Kalyani, West Bengal 741235, India;2. Department of Chemical Sciences, Indian Institute of Science Education & Research Kolkata, Mohanpur, West Bengal 741246, India;3. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India;4. Institut fur Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg Universitat Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany;1. Department of Chemistry, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran;2. Dipartimento di Chimica Inorganica, Vill. S. Agata, Salita Sperone 31, Università di Messina, 98166 Messina, Italy;3. Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran;1. Department of Chemistry, University of Jammu, Jammu 180006, J & K, India;2. X-ray Crystallographic Laboratory, Department of Physics and Electronics, University of Jammu, Jammu 180006, J & K, India;1. Department of Chemistry, Panjab University, India;2. Department of Microbiology, Panjab University, Chandigarh 160014, India;3. Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand;1. Chemistry Department, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa;2. Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
Abstract:We have carried out 1H NMR at T=1.5 K in both 57Fe-enriched Fe8 cluster and non-enriched Fe8 cluster to investigate isotope substitution effects on magnetic properties. The field dependence of 1/T1 can be fitted well by using a simple model in terms of the thermal fluctuations of the total spin S=10 of the cluster originating from the spin–phonon interactions. The absence of a difference of the magnetic field dependence of 1/T1 between the two systems indicates that the spin–phonon coupling constant is not affected by the change of mass of the isotopes in the Fe8 cluster.
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