Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-03-08
Physics
Condensed Matter
Strongly Correlated Electrons
Revtex, 5 pages, 4 figures (postscript)
Scientific paper
10.1103/PhysRevB.58.11484
Experimental data for the uniform susceptibility, magnetization and specific heat for the material Cu2(C5H12N2)2Cl4 (abbreviated CuHpCl) as a function of temperature and external field are compared with those of three different dimerized spin models: alternating spin-chains, spin-ladders and the bilayer Heisenberg model. It is shown that because this material consists of weakly coupled spin-dimers, much of the data is insensitive to how the dimers are coupled together and what the effective dimensionality of the system is. When such a system is tuned to the quantum critical point by application of a field, the dimensionality shows up in the power-law dependences of thermodynamic quantities on temperature. We discuss the temperature window for such a quantum critical behavior in CuHpCl.
Elstner Norbert
Singh Rajiv R. P.
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