Microwave response near zero magnetic field in transition-metal-doped silicate glasses
Abbreviated Journal Title
Appl. Phys. Lett.
SIZE POWDERS; MAGNETOABSORPTION; SUPERCONDUCTORS; MAGNETORESISTANCE; LA0.7SR0.3MNO3; ABSORPTION; RESONANCE; Physics, Applied
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].
Applied Physics Letters
"Microwave response near zero magnetic field in transition-metal-doped silicate glasses" (2000). Faculty Bibliography 2000s. 2756.