Abstract
We report on Co K-edge x-ray magnetic circular dichroism (XMCD) measurements of LaCoO3 single crystal in temperature range from 5 to 300 K and external magnetic field of 17 T. The response consists of pre-edge (at 7712 eV) and bi-polar peak (up at 7727, down at 7731 eV) with amplitudes, respectively, less than 10-3 and 10-2 of the Co K-edge jump. Using the sum rule the orbital magnetic moment of 4p Co is evaluated. Its temperature dependence reaches a maximum of (2.7 ± 0.9) x10-3 μB at 120 K, following the trend for the total magnetic moment on the Co obtained from the superconducting quantum interference device measurements. However, on warming from 25 to 120 K, the orbital magnetic moment of the 4p Co doubles while total magnetic moment of Co increases 10 times. First principle calculations are in order to relate the Co K-edge XMCD results to the orbital and spin moment of 3d Co.
Highlights
A perovskite LaCoO3 exhibits variety of physical properties [1-11]
The X-ray absorption near edge spectra (XANES) consists of two areas: the pre-edge (7709-7716 eV) due to a quadruple transition from 1s to unoccupied 3d, and the main edge (7716-7740 eV) due to a dipole transition from 1s to unoccupied 4p -states
The 3d of Co are split into t2g and eg by the crystal field that clearly seen as a doublet P1- P2
Summary
Journal of Physics: Conference Series 712 (2016) 012111 doi:10.1088/1742-6596/712/1/012111. V Efimov, A Ignatov, I O Troyanchuk, V V Sikolenko[1,4], A. E Efimova, S I Tiutiunnikov, D Karpinsky, V Kriventsov, E Yakimchuk, S Molodtsov, P Sainctavit and D Prabhakaran
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
