Magnetic Spin Ladder \(C5H12N\)2CuBr4: High-Field Magnetization and Scaling near Quantum Criticality
Abstract
The magnetization, M\(H<=30 T,0.7<=T<=300 K\), 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⊥ = 13.3 K and J∥ = 3.8 K, with Hc1 = 6.6 T and Hc2 = 14.6 T. An inflection point in M\(H,T = 0.7 K\) 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.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 2001
- DOI:
- 10.1103/PhysRevLett.86.5168
- arXiv:
- arXiv:cond-mat/0011052
- Bibcode:
- 2001PhRvL..86.5168W
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 4 pages, 4 figures