scholarly journals Thermodynamic properties of an S=12 ring-exchange model on the triangular lattice

2020 ◽  
Vol 101 (23) ◽  
Author(s):  
Kazuhiro Seki ◽  
Seiji Yunoki
Keyword(s):  
Thermodynamic Properties ◽  
Triangular Lattice ◽  
Exchange Model ◽  
Ring Exchange

Thermodynamic Properties of Antiferromagnetic QuantumXY-Model on the Triangular Lattice

1993 ◽  
Vol 62 (3) ◽  
pp. 880-887 ◽  
Author(s):  
Shigeo Homma ◽  
Hirotsugu Matsuda ◽  
Naofumi Ogita ◽  
Kazuhiro Sano
Keyword(s):  
Thermodynamic Properties ◽  
Triangular Lattice

scholarly journals Octupolar Order in the Multiple Spin Exchange Model on a Triangular Lattice

2006 ◽  
Vol 97 (25) ◽  
Author(s):  
Tsutomu Momoi ◽  
Philippe Sindzingre ◽  
Nic Shannon
Keyword(s):  
Triangular Lattice ◽  
Spin Exchange ◽  
Exchange Model

scholarly journals Spin wave theory of spin-1/2 XY model with ring exchange on a triangular lattice

2013 ◽  
Vol 91 (7) ◽  
pp. 542-547 ◽  
Author(s):  
Solomon A. Owerre
Keyword(s):  
Phase Transition ◽  
Spin Wave ◽  
Triangular Lattice ◽  
Finite Temperature ◽  
Wave Theory ◽  
Square Lattice ◽  
Xy Model ◽  
Superfluid Phase ◽  
Zero Temperature ◽  
Ring Exchange

We present the linear spin wave theory calculation of the superfluid phase of a hard-core boson J-K model with nearest neighbour exchange J and four-particle ring-exchange K at half filling on the triangular lattice, as well as the phase diagrams of the system at zero and finite temperatures. A similar analysis has been done on a square lattice (Schaffer et al. Phys. Rev. B, 80, 014503 (2009)). We find similar behaviour to that of a square lattice but with different spin wave values of the thermodynamic quantities. We also find that the pure J model (XY model), which has a well-known uniform superfluid phase with an ordered parameter [Formula: see text] at zero temperature is quickly destroyed by the inclusion of negative-K ring-exchange interactions, favouring a state with a (4π/3, 0) ordering wavevector. We further study the behaviour of the finite-temperature Kosterlitz–Thouless phase transition (TKT) in the uniform superfluid phase, by forcing the universal quantum jump condition on the finite-temperature spin wave superfluid density. We find that for K < 0, the phase boundary monotonically decreases to T = 0 at K/J = −4/3, where a phase transition is expected and TKT decreases rapidly, while for positive K, TKT reaches a maximum at some K ≠ 0. It has been shown on a square lattice using quantum Monte Carlo (QMC) simulations that for small K > 0 away from the XY point, the zero-temperature spin stiffness value of the XY model is decreased (Melko and Sandvik. Ann. Phys. 321, 1651 (2006)). Our result seems to agree with this trend found in QMC simulations for two-dimensional systems.

scholarly journals Thermodynamic Properties in Triangular-Lattice Superconductors

2016 ◽  
Vol 183 (5-6) ◽  
pp. 329-341 ◽  
Author(s):  
Xixiao Ma ◽  
Ling Qin ◽  
Huaisong Zhao ◽  
Yu Lan ◽  
Shiping Feng
Keyword(s):  
Thermodynamic Properties ◽  
Triangular Lattice
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