Magnetic-field-induced Heisenberg to XY crossover in a quasi-2D quantum antiferromagnet

27th International Conference on Low Temperature Physics

Fortune, N.A.^1 ; Hannahs, S.T.^2 ; Landee, C.P.^3 ; Turnbull, M.M.^4 ; Xiao, F.^5

Department of Physics, Smith College, Northampton

MA, United States^1

National High Magnetic Field Laboratory, Florida State University, Tallahassee

FL, United States^2

Department of Physics, Clark University, Worcester

MA, United States^3

Department of Chemistry, Clark University, Worcester

MA, United States^4

Department of Physics, Durham University, Durham, United Kingdom^5

关键词: Calorimetric measurements;    Crossover behavior;    Field induced;    Heisenberg antiferromagnets;    Magnetic phase diagrams;    Ordering temperature;    Quantum antiferromagnets;    Saturation fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/4/042004/pdf
DOI  :  10.1088/1742-6596/568/4/042004

来源: IOP

【 摘 要 】

The magnetic-field-dependent ordering temperature of the quasi-2D quantum Heisenberg antiferromagnet (QHAF) Cu(pz)2(ClO4)2was determined by calorimetric measurement in applied dc fields up to 33 tesla. The magnetic phase diagram shows a round maximum at 5.95 K and 17.5 T (at ≈ 1/3 of its saturation field), a 40 percent enhancement of the ordering temperature above the zero field value of 4.25 K. The enhancement and reentrance are consistent with predictions of a field-induced Heisenberg to XY crossover behavior for an ideal 2D QHAF system.