Magneto-Induced Microwave Conductivity In Mn2+-Doped Silicate Glass
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 non-resonant 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.
Journal of Non-Crystalline Solids
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Glebov, L. B.; Glebova, L. N.; and Jones, D. E., "Magneto-Induced Microwave Conductivity In Mn2+-Doped Silicate Glass" (2000). Scopus Export 2000s. 868.