Field dependent thermodynamics and Quantum Critical Phenomena in the dimerized spin system Cu2(C5H12N2)2Cl4

Abstract

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.

Revtex, 5 pages, 4 figures (postscript)

References in corpus (5)

• Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7
• NMR study of the S=1/2 Heisenberg Ladder Cu2(C5H12N2)2Cl4 : Quantum phase transition and critical dynamics
• Spin gap in the Quasi-One-Dimensional S=1/2 Antiferromagnet: Cu2(1,4-diazacycloheptane)2Cl4
• Identification of Nuclear Relaxation Processes in a Gapped Quantum Magnet: Proton NMR in the S=1/2 Heisenberg Ladder Cu2(C5H12N2)2Cl4
• Strong-coupling Expansions at Finite Temperatures: Application to Quantum Disordered and Quantum Critical Phases

Cited by in corpus (4)

• Eighth-order high-temperature expansion for general Heisenberg Hamiltonians
• Integrable models and quantum spin ladders: comparison between theory and experiment for the strong coupling ladder compounds
• NMR relaxation rate of (quasi-)one-dimensional spin gapped systems in magnetic fields
• Magnons and continua in a magnetized and dimerized spin-1/2 chain