First-order transition between magnetic order and valence bond order in a 2D frustrated Heisenberg model
نویسندگان
چکیده
منابع مشابه
First and second order transition of frustrated Heisenberg spin systems
Starting from the hypothesis of a second order transition we have studied modifications of the original Heisenberg antiferromagnet on a stacked triangular lattice (STA–model) by the Monte Carlo technique. The change is a local constraint restricting the spins at the corners of selected triangles to add up to zero without stopping them from moving freely (STAR–model). We have studied also the cl...
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The results of extensive Monte Carlo simulations of magnetic-field induced transitions in the xy model on a stacked triangular lattice with antiferromag-netic intraplane and ferromagnetic interplane interactions are discussed. A low-field transition from the paramagnetic to a 3-state (Potts) phase is found to be very weakly first order with behavior suggesting tricriticality at zero field. In a...
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We study a frustrated Heisenberg S 1 quantum spin chain with next-nearest neighbor (NNN) coupling a using a variational ansatz and the density matrix renormalization group. We find as quantum remnants of the phase transition in the classical chain a disorder point at a D 0.284͑1͒ and a Lifshitz point at a L 0.3725͑25͒. Our main finding is a first-order transition from an Affleck-Kennedy-Lieb-...
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The nature of the phase transition for the XY stacked triangular antifer-romagnet (STA) is a controversial subject at present. The field theoretical renormalization group (RG) in three dimensions predicts a first order transition. This prediction disagrees with Monte Carlo (MC) simulations which favor a new universality class or a tricritical transition. We simulate by the Monte Carlo method tw...
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ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 1996
ISSN: 0295-5075,1286-4854
DOI: 10.1209/epl/i1996-00430-0