Magnetoresistance, magnetoimpedance, magnetothermopower, and photoconductivity in silver-doped manganese sulfides

Abstract

New multifunction materials in the AgXMn1‒XS (Х = 0.05) system have been synthesized and investigated in the temperature range of 77‒500 K in magnetic fields up to 12 kOe. Near the temperature of the magnetic transition (ТN = 176 K), the anomalous behavior of the temperature dependence of magnetization has been observed and has been attributed to the formation of ferrons. An analysis of the infrared spectroscopy data and I‒V characteristics has revealed the spin-polaron subband splitting. Several conductivity channels have been found from the impedance spectra. The temperature and magnetic field dependences of the carrier relaxation time have been obtained. The magnetoresistance (−21%), magnetoimpedance (−65%), magnetothermopower (−40%), and photoconductivity effects have been detected. The majority carrier type, density, and mobility have been determined from the Hall-effect measurement data. The observed effects have been explained using a ferron model.

Влияние Электронного И Дырочного Допирования На Транспортные Характеристики Халькогенидных Систем

“…Твердые растворы Ag 0.01 Mn 0.99 S и Tm 0.01 Mn 0.99 S были синтезированы кристаллизацией из расплава полученных порошковых сульфидов в стеклоуглеродных тиглях и кварцевом реакторе [16,17]. Рентгеноструктурный анализ (РСА) был выполнен на рентгеновской установке ДРОН-3 с использованием CuK α -излучения при T = 300 K.…”

Magnetoresistive effect in YbxMn1-xSat small concentrations

“…A strong magnetoresistive effect was detected in the vicinity of the orbital ordering in the two-orbit Hubbard model with ¼ the electron filling function at the site [14]. The resistance detects a small maximum in the region of formation of the orbital ordering [15], the electron density of states at the Fermi level splits in the magnetic field, which leads to an increase in the resistance in the paramagnetic phase [16][17]. The formation of an orbital ordering is accompanied by lattice deformations and changes in the magnetic state [18][19][20].…”

Electric Power Sources Based on the Seebeck Effect of Manganese Sulfides with Rare Earth Substitution

“…The Seebeck coefficient can reach high values in the region of magnetic and structural phase transitions [12][13][14][15][16][17][18]. Thermoelectricity depends on the conductivity in semiconductors, which can be changed by a magnetic field [19][20][21][22][23][24].…”