Union Jack and checkerboard lattices with easy plane single ion anisotropy

Antônio Sérgio Teixeira Pires

Use este identificador para citar ou linkar para este item: http://hdl.handle.net/1843/54907

Tipo:	Artigo de Periódico
Título:	Union Jack and checkerboard lattices with easy plane single ion anisotropy
Autor(es):	Antônio Sérgio Teixeira Pires
Resumo:	The zero-temperature phase diagrams of the antiferromagnetic Union Jack and checkerboard lattices, with spin one and an easy-plane single anisotropy term, are studied using the SU(3) Schwinger boson formalism (also known as flavor wave theory). We find that the Union Jack lattice has a quantum phase transition (QPT) at J2/J1 = 0.707 between a Néel and a collinear phase, while the checkerboard lattice has a QPT at J2/J1 = 0.785, from the Néel to a magnetically disordered phase. The ground state phase diagrams of the two models are different, both from each other and from that of the square lattice antiferromagnet with all the next nearest neighbors. For the checkerboard lattice, we calculate the spin gap and the ground state energy in the disordered phase. This phase is a candidate for a spin liquid state.
Assunto:	Antiferromagnetismo Transições de fases
Idioma:	eng
País:	Brasil
Editor:	Universidade Federal de Minas Gerais
Sigla da Instituição:	UFMG
Departamento:	ICX - DEPARTAMENTO DE FÍSICA
Tipo de Acesso:	Acesso Restrito
Identificador DOI:	https://doi.org/10.1016/j.jmmm.2017.07.027
URI:	http://hdl.handle.net/1843/54907
Data do documento:	2017
metadata.dc.url.externa:	https://www.sciencedirect.com/science/article/pii/S0304885316334539
metadata.dc.relation.ispartof:	Journal of Magnetism and Magnetic Materials
Aparece nas coleções:	Artigo de Periódico

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