Title

Magneto-induced microwave conductivity in Mn2+-doped silicate glass

Authors

Authors

L. B. Glebov; L. N. Glebova; D. E. Jones;R. R. Rakhimov

Comments

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Abbreviated Journal Title

J. Non-Cryst. Solids

Keywords

HIGH-TC SUPERCONDUCTORS; ABSORPTION; MAGNETORESISTANCE; LA0.7SR0.3MNO3; RESONANCE; RF; Materials Science, Ceramics; Materials Science, Multidisciplinary

Abstract

A non-resonant microwave absorption induced by low magnetic field (magneto-induced microwave conductivity) was observed in Na2O-CaO-MgO-SiO2 glasses doped with Mn in addition to the usual EPR signal of Mn2+. The nonresonant response increases with the increase of Mn2+ concentration in glasses. In contrast to the EPR signal, the magnitude of non-resonant absorption does not show saturation at high microwave power and grows much faster as the temperature decreases. The magneto-induced microwave conductivity in the glass dielectric is explained by the magnetic field-dependent electron tunneling between non-bridging oxygen ions adjacent to paramagnetic Mn2+ ions. The high probability of tunneling is provided by aligning the electron spins in Mn2+ and adjacent non-bridging oxygen ions in the external magnetic field. (C) 2000 Elsevier Science B.V. All rights reserved.

Journal Title

Journal of Non-Crystalline Solids

Volume

265

Issue/Number

1-2

Publication Date

1-1-2000

Document Type

Letter

Language

English

First Page

181

Last Page

184

WOS Identifier

WOS:000085859800023

ISSN

0022-3093

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