Field-dependent thermodynamics and quantum critical phenomena in the dimerized spin system Cu-2(C5H12N2)(2)Cl-4

Article

关键词: HEISENBERG-ANTIFERROMAGNET;    COMPOUND (VO)(2)P2O7;    MAGNETIC EXCITATIONS;    NEUTRON-SCATTERING;    SERIES EXPANSIONS;    CHAIN COMPOUND;    2-LEG LADDERS;    GROUND-STATE;    TRANSITION;    GAP;   

DOI  :  10.1103/PhysRevB.58.11484

来源: SCIE

【 摘 要 】

Experimental data for the uniform susceptibility, magnetization, and specific heat for the material Cu-3(C5H12N2)(2)Cl-4 (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 are 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, dimensionality shows up in the power-law dependences of thermodynamic quantities on the temperature. We discuss the temperature window for such a quantum critical behavior in CuHpCl. [S0163-1829(98)05838-X].

【 授权许可】

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