کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1859372 | 1037308 | 2012 | 6 صفحه PDF | دانلود رایگان |
Spin-1/2 Ising model with a spin-phonon coupling on decorated planar lattices partially amenable to lattice vibrations is examined using the decoration-iteration transformation and harmonic approximation. It is shown that the magnetoelastic coupling gives rise to an effective antiferromagnetic next-nearest-neighbour interaction, which competes with the nearest-neighbour interaction and is responsible for a frustration of decorating spins. A strong enough spin-phonon coupling consequently leads to an appearance of striking partially ordered and partially disordered phase, where a perfect antiferromagnetic alignment of nodal spins is accompanied with a complete disorder of decorating spins. Thermal dependences of the specific heat are explored in detail.
► Decorated planar Ising model with a magnetoelastic coupling is exactly solved.
► Spin-phonon coupling induces a unusual spin frustration.
► Antiferromagnetic long-range order may coexist with a partial disorder.
► Temperature variations of total specific heat depends on a spin-phonon coupling.
Journal: Physics Letters A - Volume 376, Issue 3, 2 January 2012, Pages 197–202