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Magnetoresistance in Non-stoichiometric Silver Chalcogenides by B. Mogwitz; G. Beck; F. Gruhl; M. von Kreutzbruck; J. Janek is a Chemistry article available to read on EtoBox.

What is Magnetoresistance in Non-stoichiometric Silver Chalcogenides about?

Recently a large positive magneto-resistance (MR) effect was discovered in semiconduct α-silver selenide samples with a composition between "Ag 2,01 Se" and "Ag 2,33 Se" [1]. MR effects up to 120% have been observed at room temperature and magnetic fields of 5,5 T. The magnetic field dependence showed no evidence of saturation up to 5,5 T and was linear down to 10 mT. As known from the phase diagram, samples of α-Ag 2ϩδ Se with a silver excess higher than δ max 10 Ϫ4 are heterogeneous. Therefore we prepared homogeneous α-Ag 2ϩδ Se samples with precisely defined silver excess within the phase field and heterogeneous samples with high silver excess up to "Ag 2,3 Se". Homogeneous samples of α-Ag 2ϩδ Se show a positive and small ordinary magneto-resistance (OMR) with quadratic field dependence. The dependence of the MR effect on the non-stoichiometry can be well understood on the basis of the defect structure of the material. For heterogeneous samples we find both a positive MR effect with linear field dependence and a negative MR effect, which saturates at higher fields. A change from one effect to the other is observed on thermal treatment and is most probably due to a change in the

Who reads Magnetoresistance in Non-stoichiometric Silver Chalcogenides?

Author

B. Mogwitz; G. Beck; F. Gruhl; M. von Kreutzbruck; J. Janek

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 0372-7874)

Published

2002

Language

DE

Field

Chemistry (Physical Sciences)