Paramagnetic tunneling systems and their contribution to the polarization echo in glasses (extended)

Details Paramagnetic tunneling systems and their contribution to the polarization echo in glasses (extended) Paramagnetic tunneling systems and their contribution to the polarization echo in glasses (extended)

2011-04-06

arxiv.org/abs/1104.1133v2

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

Startling magnetic effects on the spontaneous polarization echo in some silicate glasses at low and ultra-low temperatures have been reported in the last decade or so. Though some progress in search of an explanation has been made by considering the nuclear quadrupole dephasing of tunneling particles, here we show that the effect of a magnetic field can be understood quantitatively by means of a special tunnel mechanism associated with paramagnetic impurities. For the Fe-, Cr- and Nd-contaminated glasses we provide reasonable fits to the published data as a function of applied magnetic field and temperature.

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