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

    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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