Investigation of Transport Coefficients in Semimetals by the Variational Method. II. Bismuth

M. STORDEUR and G. SIMON~) BYIt is succeeded for the first time to interpret the thermoelectric and galvanomagnetic effects, in terms of a nonparabolic six-valley one-valence band model and anisotropic mixed scattering on acoustical phonons and ionized impurities and also the magnitude of thermomagnetic effects and the Lorenz numbers for Sb,Te, single crystals in dependence on temperature between 100 t o 300 K using physical relevant microscopic transport data. By a numerical analysis the effective main axis masses m z , the tilt angle of Fermi ellipsoid 8, the masses m L c , milc, the density of state effective mass md, the mobilities u l c , ullc, and the carrier density ptot are calculated. Also the Fermi level EF, the relaxation time factor zy, the mixture parameters BY and the parameter of nonparabolicity B are given. The calculated values are in good agreement with the corresponding data found by using optical effects a t 80 K and 300 K. I m Rahmen eines nichtparabolischen Sechstal-Ein-Valenzbandmodells und anisotrop-gemischterStreuung an akustischen Phononen und ionisierten Storstellen ist es erstmals gelungen, die Temperaturabhangigkeit zwischen 100 und 300 K der thermoelektrischen, galvanomagnetischen sowie der GroBe der thermomagnetischen Effekte und der Lorenzzahlen von Sb,Te,-Einkristallen mit physikalisch relevanten mikroskopischen Transportdaten zu erkliiren. Mittels einer numerischen

“…1 to 4 is of the same good quality as in the case of galvanomagnetic coefficients of Bi [5]. The fitted values for the microscopic transport parameters given in Fig.…”

Section: Discussionmentioning

confidence: 80%

“…5 shows the plot of the main-axis masses a t the valence band edge rn; and the tilt angle 6 versus temperature. Whereas these parameters are directly fitted, the effective masses mlc, mllc and the density-of-states effective mass md are calculated from these data using (2) to (5). They are also demonstrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Weak‐Field Charge Transport in Semiconducting V₂−VI₃ Compounds with Trigonal Symmetry II. Interpretation of the Weak‐Field Charge Transport in Sb₂Te₃ Single Crystals

Stordeur

Simon

1984

Galvanomagnetic Effects of Bismuth in Non‐Quantising Magnetic Fields. Pseudo‐Parabolic Model

Hansen

Mikhail

1984

The non-parabolicity of the L-point carriers and the temperature dependence of the band structure are incorporated in a model for the transport properties of bismuth. Results are given for elements of the resistivity tensor versus magnetic field a t temperatures around 80 and 300 K. A comment is made to the papers of Gitsu et al.La non-parabolicit6 des porteur au point L et la dependance de temperature de la structure des bandes sont incorporees dans un modde pour les phenombnes de transport dans le bismuth. Des resultats sont present& pour des composants du tenseur de r6~istivit8 en fonction de champ magnetique aux temperatures en environ 80 et 300 K. Un commentaire est fait sur les articles de Gitsu et al.

Determination of deformation potential constants of arsenic

Golban¹

1989

The galvanomagnetic coefficients of arsenic are calculated by means of a variational method taking intravalley scattering of charge carriers on longwave acoustic phonons into account. The experimental data of galvanomagnetic phenomena in weak magnetic fields are processed with the help of the formulae obtained and the constants of deformation potentials of electrons and holes are calculated in a wide temperature range (77 to 305 K). B npennonolrceaam BKyTpmnonHHHoro paccemm HocnTeneii s a p~n a Ha EJIMHHOBOZ-BapHaUHOHHbIM MeTOAOM BbIYEZCJIeHbI I' aJIbBaHOMaFHUTHbIe K03@@HqHeHTbI MbILUbFIIFa HOBbIX aKyCTHYeCKHX @OHOHBX. c n O M O~b E 0 IlOJIyYeHHbIX @OpMyn o 6 p a 6 o~a~~ 3HC-IIepHMeHTaJlbHbIe AaHHbIe no FaJIbBaHOMarHHTHbIM FIBJIeHHFIM B c n a 6~x MarHElTHbIX nOJIRX H BbIYEZCJIeHbI KOHCTaHTbI ae@OPMaqHOHHbIX IIOTeHUHaJIOB 3neKTPOHOB H HbIPOIF B InHpoKoZi o 6 n a c~~ TeMnepaTyp: 77 no 305 K.