Issue Eur. Phys. J. Appl. Phys. Volume 29, Number 1, January 2005 Page(s) 23 - 26 Section Semiconductors and Related Materials DOI 10.1051/epjap:2004184 Published online 30 August 2004

Eur. Phys. J. Appl. Phys. 29, 23-26 (2005)
DOI: 10.1051/epjap:2004184

Deep defect states in diluted magnetic semiconductors Pb Sn Te:Yb

E.P. Skipetrov¹, E.A. Zvereva¹, B.B. Kovalev¹, O.S. Volkova², A.V. Golubev² and E.I. Slyn'ko<sup>3

1</sup>  Physics Department of Moscow State University, Moscow 119992, Russia
²  Faculty of Material Science of Moscow State University, Moscow 199992, Russia
³  Institute of Material Science Problems, Chernovtsy 274001, Ukraine

skip@mig.phys.msu.ru
zvereva@mig.phys.msu.ru

(Received: 20 October 2003 / Received in final form: 19 May 2004 / Accepted: 25 June 2004 / Published online: 30 August 2004)

Abstract
The galvanomagnetic effects in new diluted magnetic semiconductors Pb _1-xSn _xTe:Yb were studied to build the energy level diagram under variation of the alloy composition and establish the connection between the parameters of electronic structure and magnetic properties. It was found that the Hall coefficient increases almost by order of magnitude with increasing the temperature. As tin content decreases, while the ytterbium concentration grows, the hole concentration decreases by several times. The results are explained by assuming a formation of an ytterbium-induced deep defect level in the energy spectrum of the alloys, which moves up to the top of the valence band with increasing the ytterbium concentration and pins the Fermi level within the valence band at sufficiently high impurity content. The hole concentration vs. ytterbium content dependence was used to calculate the energy position of the Fermi level in the frame of two-band dispersion law and to determine the position of Yb level in the alloys. The diagram of the charge carrier energy spectrum under varying the alloy composition was built.

PACS
71.28.+d - Narrow-band systems; intermediate-valence solids.
71.55.-i - Impurity and defect levels.
72.15.Gd - Galvanomagnetic and other magnetotransport effects.

© EDP Sciences 2005

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