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Experimental data for the uniform susceptibility, magnetization and specificheat for the material Cu2(C5H12N2)2Cl4 (abbreviated CuHpCl) as a function oftemperature and external field are compared with those of three differentdimerized spin models: alternating spin-chains, spin-ladders and the bilayerHeisenberg model. It is shown that because this material consists of weaklycoupled spin-dimers, much of the data is insensitive to how the dimers arecoupled together and what the effective dimensionality of the system is. Whensuch a system is tuned to the quantum critical point by application of a field,the dimensionality shows up in the power-law dependences of thermodynamicquantities on temperature. We discuss the temperature window for such a quantumcritical behavior in CuHpCl.Comment: Revtex, 5 pages, 4 figures (postscript

physical review. b, condensed matter

Field-dependent thermodynamics and quantum critical phenomena in the dimerized spin system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml…

Field-dependent thermodynamics and quantum critical phenomena in the dimerized spin systemCu2(C5