Fluctuation-induced ferrimagnetism in sublattice-imbalanced antiferromagnets with application to SrCu2(BO3)2 under pressure

被引:2
作者
Consoli, Pedro M. [1 ]
Fornoville, Max
Vojta, Matthias
机构
[1] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
关键词
QUANTUM PHASE-TRANSITIONS; DIMER GROUND-STATE; MODEL; ORDER;
D O I
10.1103/PhysRevB.104.064422
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We show that a collinear Heisenberg antiferromagnet, whose sublattice symmetry is broken at the Hamiltonian level, becomes a fluctuation-induced ferrimagnet at any finite temperature T below the Neel temperature T-N. We demonstrate this using a layered variant of a square-lattice J(1)-J(2) model. Linear spin-wave theory is used to determine the low-temperature behavior of the uniform magnetization, and nonlinear corrections are argued to yield a temperature-induced qualitative change of the magnon spectrum. We then consider a layered Shastry-Sutherland model, describing a frustrated arrangement of orthogonal dimers. This model displays an antiferromagnetic phase for large intradimer couplings. A lattice distortion which breaks the glide symmetry between the two types of dimers corresponds to broken sublattice symmetry and hence gives rise to ferrimagnetism. Given indications that such a distortion is present in the material SrCu2(BO3)(2) under hydrostatic pressure, we suggest the existence of a fluctuation-induced ferrimagnetic phase in pressurized SrCu2(BO3)(2). We predict a nonmonotonic behavior of the uniform magnetization as function of temperature.
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页数:11
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