| Autor: |
Watson BC; Department of Physics and The Center for Condensed Matter Sciences, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA., Kotov VN, Meisel MW, Hall DW, Granroth GE, Montfrooij WT, Nagler SE, Jensen DA, Backov R, Petruska MA, Fanucci GE, Talham DR |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2001 May 28; Vol. 86 (22), pp. 5168-71. |
| DOI: |
10.1103/PhysRevLett.86.5168 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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