Title

Microwave response near zero magnetic field in transition-metal-doped silicate glasses

Authors

Authors

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

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

SIZE POWDERS; MAGNETOABSORPTION; SUPERCONDUCTORS; MAGNETORESISTANCE; LA0.7SR0.3MNO3; ABSORPTION; RESONANCE; Physics, Applied

Abstract

A sharp microwave response centered at zero magnetic field was observed in manganese- and iron-doped Na2O-CaO-MgO-SiO2 glasses with phase opposite to the normal Mn+2 and Fe+3 paramagnetic signals. The response can be described as magneto-induced microwave conductivity in the dielectric glass that derives from spin-dependent charge migration within the first coordination sphere of the paramagnetic ion. In contrast to the spin-polarized tunneling in ferromagnets between different valence states of metals, the observed effect is due to spin-dependent tunneling that occurs in the vicinity of manganese or iron in diluted paramagnetic systems. (C) 2000 American Institute of Physics. [S0003-6951(00)02706-6].

Journal Title

Applied Physics Letters

Volume

76

Issue/Number

6

Publication Date

1-1-2000

Document Type

Article

Language

English

First Page

751

Last Page

753

WOS Identifier

WOS:000085075200031

ISSN

0003-6951

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