Conduction electron spin resonance in x

V. Likodimos; S. Koutandos; M. Pissas; G. Papavassiliou; K. Prassides

doi:10.1209/epl/i2003-00257-1

All issues

Volume 61 / No 1 (January 2003)

Europhys. Lett., 61 1 (2003) 116-121

Abstract

Issue		Europhys. Lett. Volume 61, Number 1, January 2003


Page(s)		116 - 121
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00257-1
Published online		01 January 2003

Europhys. Lett., 61 (1), pp. 116-121 (2003)

Conduction electron spin resonance in $\chem{Mg}$ $_{1-x}$ $\chem{Al}$ _x $\chem{B_2}$

V. Likodimos¹, S. Koutandos², M. Pissas², G. Papavassiliou² and K. Prassides²^,3

¹ Department of Physics, National Technical University of Athens 157 80 Athens, Greece
² Institute of Materials Science, NCSR Demokritos 153 10 Aghia Paraskevi, Athens, Greece
³ School of Chemistry, Physics and Environmental Science University of Sussex - Brighton BN1 9QJ, UK

Received: 24 June 2002
Accepted: 14 October 2002

Abstract

Conduction electron spin resonance is employed to study the interplay of the electronic and structural properties in the normal state of $\chem{Mg}$ $_{1-x}$ $\chem{Al}$ _x $\chem{B_2}$ alloys as a function of $\chem{Al}$ -doping for $0\leq x\leq 1$ . The x-dependence of the spin susceptibility reveals considerable reduction of the total density of states $N(E_\ab{F})$ with increasing $\chem{Al}$ concentration, complying with theoretical predictions for a predominant filling effect of the hole σ bands by electron doping. The CESR linewidth exhibits significant broadening, especially prominent in the high- $\chem{Al}$ -content region, indicative of the presence of enhanced structural disorder, consistent with the presence of compositional fluctuations.

PACS: 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.) / 76.30.Pk – Conduction electrons / 74.62.Dh – Effects of crystal defects, doping and substitution

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