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28 March 2024
 
  » pubmed » pmid11384448

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Magnetic spin ladder (C5H12N)2CuBr4: high-field magnetization and scaling near quantum criticality
B C Watson ; V N Kotov ; M W Meisel ; D W Hall ; G E Granroth ; W T Montfrooij ; S E Nagler ; D A Jensen ; R Backov ; M A Petruska ; G E Fanucci ; D R Talham ;
Date 28 May 2001
Journal Phys Rev Lett, 86 (22), 5168-71
AbstractThe 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.
Source PubMed, pmid11384448
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