THEORETICAL STUDY ON THE ELECTRICAL PROPERTIES OF Eu, Tm AND Sm CHALCOGENIDE COMPOUNDS

Abstract

A theoretical study on Eu, Tm and Sm Chalcogenide compounds has been made for determining the electrical transport properties using only two parameters, namely lattice constant and activation energy. The calculated electrical properties such as electrical resistivity, carrier mobility, carrier concentration, carrier effective mass and dielectric constant of different pressures are compared with the available experimental results. They are found to be in good agreement with each other. Then, the limitation of this theoretical study is also discussed.PACS Number(s): 72.15.Eb

Dithiocarbamate Precursors for Rare-Earth Sulfides

“…The europium chalcogenides EuE form one of the major classes of magnetic semiconductors. , These binary europium chalcogenides have the rocksalt structure type, exhibit a variety of magnetic ordering, and have often served as model Heisenberg magnets . These compounds were considered “thoroughly investigated” in a review over 30 years ago, yet, the europium chalcogenides continue to be of theoretical − as well as experimental − interest. In part, this is due to advances in theory and computation, but also because of the potential for EuS to act as a spin filter − important in “spintronics”, devices that use the property of electron spin and charge. , It is quite interesting to consider the effect of particle size on the magnetic properties of the europium chalcogenides.…”

“…The relative position of the 4f electrons varies for each lanthanide, resulting in a number of electronic and magnetic properties. Many of the compounds, particularly SmE, TmE, and YbE, have electronic properties that have been modeled theoretically , and studied experimentally for the relationship between the electronic structure and the magnetic ordering and the question of valency in these compounds. , These properties are very sensitive to band gap changes as a function of pressure, but none have been studied as a function of particle size.…”