Quantum phase transition in square- and triangular-lattice spin-½ antiferromagnets
نویسندگان
چکیده
منابع مشابه
Spin - 12 quantum antiferromagnets on the triangular latticeP
The spin-1 2 anisotropic Heisenberg antiferromagnet is studied at T = 0 on the triangular lattice via numerical diagonalization for system sizes up to N = 36 sites. Extrapolation to the thermodynamic limit suggests that the isotropic system possesses no, or very small, p 3 p 3 magnetic order; no helical or chiral order; and spin-spin correlations consistent with that of a critical phase. For XY...
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Cs2CuBr4 and Ba3NiSb2O9 are magnetically described as quasi-two-dimensional triangular-lattice antiferromagnets with spin1 2 and 1, respectively. We show that both systems exhibit a magnetization plateau at one-third of the saturation magnetization Ms due to the interplay of spin frustration and quantum fluctuation. In Cs2CuBr4 that has a spatially anisotropic triangular lattice, successive mag...
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We investigate the critical parameters of an order-disorder quantum phase transitions in the spin-12 J−J ′ Heisenberg and XY antiferromagnets on square lattice. Basing on the excitation gaps calculated by exact diagonalization technique for systems up to 32 spins and finite-size scaling analysis we estimate the critical couplings and exponents of the correlation length for both models. Our anal...
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The selection of the ground state among nearly degenerate states due to quantum fluctuations is studied for the S = 1/2 XY-like Heisenberg antiferromagnets on the triangular lattice in the magnetic field applied along the hard axis, which was first pointed out by Nikuni and Shiba. We find that the selected ground state sensitively depends on the degree of the anisotropy and the magnitude of the...
متن کاملNeutron Scattering of Spin Waves in Square Lattice Quantum Antiferromagnets at high and low energies
Acknowledgements I would like to thank Henrik Rønnow for his supervision of this master thesis work and for introducing me to the field of quantum magnetism. My thanks also to Kruno Prsa from the LQM and Monica Jimenez from the ILL for their precious help in guiding me through my first TAS experiment. I thank also Ross Stewards and Russel Ewings from ISIS for the time they took to introduce me ...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1996
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.53.9168