Magnetic spin ladder (C5H12N)2CuBr4: high-field magnetization and scaling near quantum criticality.
The magnetization, M(H< or =30 T,0.7< or =T< or =300 K), 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( perpendicular) = 13.3 K and J( parallel) = 3.8 K, with H(c1) = 6.6 T and H(c2) = 14.6 T. An inflection point in M(H,T = 0.7 K) at half saturation, M(s)/2, is described by an effective XXZ chain. The data exhibit universal scaling behavior in the vicinity of H(c1) and H(c2), indicating that the system is near a quantum critical point.
Watson
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Department of Physics and The Center for Condensed Matter Sciences, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA.
Kotov
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Backov
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