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Phys. Rev. Lett. 93, 077206 (2004) [4 pages]

Dynamics and Scaling in a Quantum Spin Chain Material with Bond Randomness

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T. Masuda1, A. Zheludev1, K. Uchinokura2, J.-H. Chung3,4, and S. Park3,4
1Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA
2The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

See Also: Erratum

Received 28 April 2004; published 12 August 2004

Single crystal inelastic neutron scattering is used to study dynamic spin correlations in the quasi-one-dimensional quantum antiferromagnet BaCu2(Si0.5Ge0.5)2O7, where the exchange constant fluctuates due to a random distribution of Si and Ge atoms. The measured low-energy spectrum is dominated by localized excitations and can be understood in the framework of the random singlet model. The observed scaling relations for the frequency dependencies of the correlation length and structure factor are in excellent agreement with recent theoretical predictions for the renormalization group fixed point.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.077206
DOI:
10.1103/PhysRevLett.93.077206
PACS:
75.10.Pq, 75.10.Nr, 75.40.Gb

See Also

Erratum: T. Masuda, A. Zheludev, K. Uchinokura, J.-H. Chung, and S. Park, Erratum: Dynamics and Scaling in a Quantum Spin Chain Material with Bond Randomness [Phys. Rev. Lett. 93, 077206 (2004)], Phys. Rev. Lett. 96, 169908 (2006).

 
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