Magneto-induced microwave conductivity in Mn2+-doped silicate glass
Abbreviated Journal Title
J. Non-Cryst. Solids
HIGH-TC SUPERCONDUCTORS; ABSORPTION; MAGNETORESISTANCE; LA0.7SR0.3MNO3; RESONANCE; RF; Materials Science, Ceramics; Materials Science, Multidisciplinary
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 of Non-Crystalline Solids
"Magneto-induced microwave conductivity in Mn2+-doped silicate glass" (2000). Faculty Bibliography 2000s. 7922.