Frustrated Heisenberg antiferromagnet on the pyrochlore lattice
作者： Akihisa Koga , Norio Kawakami
DOI: 10.1103/PHYSREVB.63.144432
关键词: Tetrahedron 、 Quantum phase transition 、 Antiferromagnetism 、 Spin (physics) 、 Physics 、 Condensed matter physics 、 Series expansion 、 Phase diagram 、 Pyrochlore 、 Heisenberg model
摘要: We investigate quantum phase transitions for the $s=\frac{1}{2}$ antiferromagnetic Heisenberg model on pyrochlore lattice. By means of series expansion method starting from isolated tetrahedra, ground-state diagram is determined. When ratio two competing exchange couplings varied, a first-order (second-order) transition occurs between spin gap phases (the spin-gap and phases). also discuss some properties expected $s=1$ system.
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