Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-07-30
Phys.Rev.A77:022106,2008
Physics
Condensed Matter
Other Condensed Matter
Revtex, 36 pages, 9 figures (submitted in low resolution, better quality figures are available from the authors)
Scientific paper
10.1103/PhysRevA.77.022106
Earlier, the magnetoelectric effect of chromium sesquioxide Cr_2O_3 has been determined experimentally as a function of temperature. One measures the electric field-induced magnetization on Cr_2O_3 crystals or the magnetic field-induced polarization. From the magnetoelectric moduli of Cr_2O_3 we extract a 4-dimensional relativistic invariant pseudoscalar $\widetilde{\alpha}$. It is temperature dependent and of the order of 10^{-4}/Z_0, with Z_0 as vacuum impedance. We show that the new pseudoscalar is odd under parity transformation and odd under time inversion. Moreover, $\widetilde{\alpha}$ is for Cr_2O_3 what Tellegen's gyrator is for two port theory, the axion field for axion electrodynamics, and the PEMC (perfect electromagnetic conductor) for electrical engineering.
Hehl Friedrich W.
Rivera Jean-Pierre
Schmid Harald
~Obukhov Yuri N.
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