Specific heat of two–dimensional diluted magnets
نویسنده
چکیده
Using Monte Carlo techniques, the two–dimensional site–diluted Ising model is studied. In particular, properties of the specific heat, its critical behaviour and the emergence of a non–singular maximum above the transition temperature at moderate concentration of defects, are discussed.
منابع مشابه
ANALYSIS OF SOME MAGNETIC PROPERTIES OF DILUTED MAGNETIC SEMICONDUCTORS
The susceptibility and specific heat experimental results of the diluted magnetic semiconductors (DMS) are incorporated in a model based on short-range as well as long-range interaction in a random may of magnetic ions. The so-called nearestneighbor pair approximation (NNPA) is applied. It appears that the calculated values of zero field specific heat and Curie-Weiss temperature based on th...
متن کاملHeat conduction in low-dimensional quantum magnets
Transport properties provide important information about the mobility, elastic and inelastic of scattering of excitations in solids. Heat transport is well understood for phonons and electrons, but little is known about heat transport by magnetic excitations. Very recently, large and unusual magnetic heat conductivities were discovered in low-dimensional quantum magnets. This article summarizes...
متن کاملCritical Behavior of the Two-dimensional Randomly Site-diluted Ising Model via Wang-landau Algorithm
The critical properties of the randomly site-diluted two-dimensional Ising model were studied using the Wang-Landau algorithm. The concentration of nonmagnetic sites was q = 0.1; the remaining sites were occupied by magnetic particles. The study was carried out in the appropriate restricted but dominant energy subspaces. The main effort was focused on the specific heat and magnetic susceptibili...
متن کاملSpecific Heat Exponent of Random – Field Ising Magnets
Zero – temperature simulations of the 3 d = random–field Ising model (RFIM) with a bimodal distribution suggest that the specific heat's critical behaviour is consistent with an exponent 0 α ≃ . Τhis is compatible with experimental measurements on random – field and diluted – antiferromagnetic systems and, together with previous simulations on the Gaussian RFIM, settles a clear picture for the ...
متن کاملThe Effect of Heat Treatment on Microstructure and Magnetic Properties of Nd17Fe76.5B5Cu1.5 Type Sintered Magnets
The effects of high temperature homogenization and low temperature annealing treatments on the microstructure and magnetic properties of sintered magnets of an Nd17Fe76.5B5Cu1.5 type alloy have been investigated. The microstructure of the as-cast alloy, consisted of three phases including a Nd2Fe14B1 (2:14:1- type) matrix phase Cu-containing Nd-rich Phase and Free α-iron. The as-sintered magnet...
متن کامل