Magnetic properties of Heisenberg triangular antiferromagnet V15 cluster studied by NMR
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- Furukawa, Y., Nishisaka, Y., Kumagai, K. et al. Hyperfine Interact (2007) 176: 65. doi:10.1007/s10751-008-9614-z
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The magnetic properties of an s = 1/2 Heisenberg triangular antiferromagnet V15 have been studied by proton nuclear magnetic resonance (NMR) at very low temperature down to 100 mK using a He3-He4 dilution refrigerator. In total spin ST = 3/2 ground state above 2.7 Tesla, proton spin-lattice relaxation rate (1/T1) shows thermally activated behavior as a function of temperature. On the other hand, a temperature independent behavior of 1/T1 at very low temperatures is observed in frustrated ST = 1/2 ground state below 2.7 Tesla. Possible origins for the peculiar behavior of 1/T1 will be discussed in terms of magnetic fluctuations due to spin frustration.