منابع مشابه
First-Order Phase Transitions in Frustrated Spin Systems
We give a short review of our recent works on the first-order quantum phase transitions in frustrated spin chains with orthogonal-dimer structure. When the ratio of the competing antiferromagnetic exchange couplings is varied, a first-order transition occurs between the dimer phase and the plaquette phase, which is accompanied by the discontinuity in the spin excitation gap. We further show tha...
متن کاملTailoring the magnetic order in mesoscopic spin systems
Stopfel, H. 2017. Tailoring the magnetic order in mesoscopic spin systems. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1574. 78 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0099-3. Mesoscopic spin systems can be designed and fabricated using modern nano-fabrication techniques. These systems can contain large numbers of patt...
متن کاملMulticritical behavior in frustrated spin systems with noncollinear order
We investigate the phase diagram and, in particular, the nature of the the multicritical point in three-dimensional frustrated N -component spin models with noncollinear order in the presence of an external field, for instance easyaxis stacked triangular antiferromagnets in the presence of a magnetic field along the easy axis. For this purpose we study the renormalization-group flow in a Landau...
متن کاملMagnetic order and moment distribution in doped spin-chain systems
We consider the effect of doping on the magnetic order in quasi one-dimensional (1D) antiferromagnets. First the detailed magnetic response of finite spin-1/2 chains in the presence of a staggered field is determined, which by itself shows an interesting crossover as function of length and field strength. We can then understand the ordering by including an effective coupling between the chains,...
متن کاملFirst 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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ژورنال
عنوان ژورنال: EPL (Europhysics Letters)
سال: 2011
ISSN: 0295-5075,1286-4854
DOI: 10.1209/0295-5075/95/10004