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Phys. Rev. Lett. 86, 5168–5171 (2001)

Magnetic Spin Ladder (C5H12N)2CuBr4: High-Field Magnetization and Scaling near Quantum Criticality

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B. C. Watson, V. N. Kotov, and M. W. Meisel
Department of Physics and The Center for Condensed Matter Sciences, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440

D. W. Hall
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310

G. E. Granroth, W. T. Montfrooij, and S. E. Nagler
Oak Ridge National Laboratory, Building 7692, MS 6393, P.O. Box 2008, Oak Ridge, Tennessee 37831

D. A Jensen, R. Backov, M. A. Petruska, G. E. Fanucci, and D. R. Talham
Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200

Received 9 August 2000; published in the issue dated 28 May 2001

The magnetization, M(H≤30T,0.7≤T≤300K), of (C5H12N)2CuBr4 has been used to identify this system as an S = 1/2 Heisenberg two-leg ladder in the strong-coupling limit, J⊥ = 13.3K and J∥ = 3.8K, with Hc1 = 6.6T and Hc2 = 14.6T. An inflection point in M(H,T = 0.7K) at half saturation, Ms/2, is described by an effective XXZ chain. The data exhibit universal scaling behavior in the vicinity of Hc1 and Hc2, indicating that the system is near a quantum critical point.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.5168
DOI:
10.1103/PhysRevLett.86.5168
PACS:
75.10.Jm, 75.40.Cx, 75.50.Ee, 75.50.Xx
 
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