Square-lattice magnetism of diaboleite Pb2Cu(OH)4Cl2

被引：21
|
作者：
Tsirlin, Alexander A. [1 ,2 ]
Janson, Oleg [2 ]
Lebernegg, Stefan [2 ]
Rosner, Helge [2 ]
机构：
[1] NICPB, EE-12618 Tallinn, Estonia
[2] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
来源：
PHYSICAL REVIEW B | 2013年 / 87卷 / 06期
关键词：
TOTAL-ENERGY CALCULATIONS; HYDROGEN-BOND; CRYSTAL;
D O I：
10.1103/PhysRevB.87.064404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on the quasi-two-dimensional magnetism of the natural mineral diaboleite Pb2Cu(OH)(4)Cl-2 with a tetragonal crystal structure, which is closely related to that of the frustrated spin-1/2 magnet PbVO3. Magnetic susceptibility of diaboleite is well described by a Heisenberg spin model on a diluted square lattice with the nearest-neighbor exchange of J similar or equal to 35 K and about 5% of nonmagnetic impurities. The dilution of the spin lattice reflects the formation of Cu vacancies that are tolerated by the crystal structure of diaboleite. The weak coupling between the magnetic planes triggers the long-range antiferromagnetic order below T-N similar or equal to 11 K. No evidence of magnetic frustration is found. We also analyze the signatures of the long-range order in heat-capacity data, and discuss the capability of identifying magnetic transitions with heat-capacity measurements. DOI: 10.1103/PhysRevB.87.064404
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页数：10
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