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Essential dependence of the electron g-factor
on the quasiparticle momentum is a fundamental
and, so far, largely overlooked property of
antiferromagnetic conductors. It leads to a
number of remarkable phenomena, such as
excitation of spin flip transitions by AC
*electric* field. Absorption intensity of
these transitions exceeds that of the
electron spin resonance (ESR) by some four
orders of magnitude. I develop a theory of
this phenomenon in a weakly doped
antiferromagnetic insulator.
The predictions may be relevant for a number of antiferromagnetic conductors, ranging from chromium to electron-and hole-doped cuprates, to organic conductors with spin density wave, and to heavy fermion antiferromagnetic metals. |
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