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Published on: June 28, 2018
X-ray magnetochiral dichroism: a new spectroscopic probe of parity nonconserving magnetic solids
J Goulon1, A Rogalev, F Wilhelm
1European Synchrotron Radiation Facility (E.S.R.F.), Boîte Postale 220, 38043 Grenoble Cedex, France.
Abstract:
We report the first experimental detection of x-ray magnetochiral dichroism in magnetoelectric Cr2O3. This dichroism, which does not require any polarized x-ray beam, is related to the time-reversal odd part of the optical activity tensor dominated by electric dipole-electric quadrupole E1E2 interference terms. The experiments were carried out using either a single crystal or a powdered pellet required to grow a single antiferromagnetic domain by magnetoelectric annealing. This new element (edge) specific spectroscopy offers unique access to the atomic orbital anapole moment Omega-z.
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