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EPR Spectra on Metal–Insulator Transitions in Compensated Ge:As
Author(s) -
Veinger A.I.,
Zabrodskii A.G.,
Tisnek T.V.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(200003)218:1<243::aid-pssb243>3.0.co;2-3
Subject(s) - electron paramagnetic resonance , spectral line , condensed matter physics , line width , line (geometry) , metal–insulator transition , metal , insulator (electricity) , materials science , relaxation (psychology) , chemistry , nuclear magnetic resonance , physics , optics , optoelectronics , social psychology , psychology , geometry , mathematics , astronomy , metallurgy
Principal changes of the electron paramagnetic resonance (EPR) in compensated Ge:As were found at the metal–insulator transition. EPR spectrum of metallic samples includes the Dyson line with the width increasing by the compensation. In the insulator samples this line is split into two when the temperature is lower than 4.1 K. The first one remains immovable and the second one moves to stronger magnetic fields when the temperature decreases. While the anomalous moving line has only the positive part of the derivative, the immovable line remains symmetrical. Other changes (in the temperature dependence of the line form and of the spin relaxation time) were indicated, too. The nature of these changes is discussed.