Distribution of NMR relaxations in a random Heisenberg chain

Details Distribution of NMR relaxations in a random Heisenberg chain Distribution of NMR relaxations in a random Heisenberg chain

2010-12-03

arxiv.org/abs/1012.0731v3

Phys. Rev. Lett. 106, 137202 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, LaTeX

Scientific paper

10.1103/PhysRevLett.106.137202

Nuclear magnetic resonance (NMR) measurements of the 29Si spin-lattice relaxation time T1 were used to probe the spin-1/2 random Heisenberg chain compound BaCu2(Si(1-x)Gex)2O7. Remarkable differences between the pure (x = 0) and the fully random (x = 0.5) case are observed, indicating that randomness generates a distribution of local magnetic relaxations. This distribution, which is reflected in a stretched exponential NMR relaxation, exhibits a progressive broadening with decreasing temperature, caused by a growing inequivalence of magnetic sites. Compelling independent evidence for the influence of randomness is also obtained from magnetization data and Monte Carlo calculations. These results suggest the formation of random-singlet states in this class of materials, as previously predicted by theory.

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