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Nuclear magnetic relaxation in the quasi-two-dimensional (C2H5NH3)(2)Cd1-xMnxCl4 mixed crystal systems
- Authors
- Kim, J. T.; Park, J. K.; Lee, C. H.; Lee, K. W.; Choi, E. H.; Lee, Cheol Eui
- Issue Date
- 3월-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Perovskite-type layered compounds; Percolation theory of paramagnetic impurity relaxation; Nuclear magnetic resonance
- Citation
- SOLID STATE COMMUNICATIONS, v.182, pp.47 - 49
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOLID STATE COMMUNICATIONS
- Volume
- 182
- Start Page
- 47
- End Page
- 49
- ISSN
- 0038-1098
- Abstract
- We have studied the quasi-two-dimensional layered compound systems (C2H5NH3)(2)Cd1-xMnxCL4 (0 <= x <= 1) by means of H-1 nuclear magnetic resonance (NMR) measurements. In contrast to the case of the unmixed crystal compounds (x=0, 1) following a single-exponential type of the NMR spin-lattice relaxation, a stretched-exponential type of recovery, M(t) = M-0[1 - exp( - t/T-1S)(n)], was necessary for the stoichiometric composition systems in addition to it, the exponent n depending on the randomly distributed paramagnetic Mn impurity concentration x. The spin-lattice relaxation rate T-1s(-1) thus obtained showed a maximum at a percolation threshold x(c) approximate to 0.3, in agreement with a percolation theory of the paramagnetic impurity relaxation. The stacking dimensions of the paramagnetic ions were derived from the exponent n as a function of x. (C) 2013 Elsevier Ltd. All rights reserved.
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