Accession Number : ADA623258


Title :   Experimental Verification of Van Vleck Nature of Long-Range Ferromagnetic Order in Vanadium-Doped Three-Dimensional Topological Insulator Sb2Te3


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE


Personal Author(s) : Li, Mingda ; Chang, Cui-Zu ; Wu, Lijun ; Tao, Jing ; Zhao, Weiwei ; Chan, Moses H ; Moodera, Jagadeesh S ; Li, Ju ; Zhu, Yimei


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a623258.pdf


Report Date : Jan 2015


Pagination or Media Count : 6


Abstract : We demonstrate by high resolution low temperature electron energy loss spectroscopy (EELS) measurements that the long range ferromagnetic (FM) order in vanadium (V)-doped topological insulator Sb2Te3 has the nature of van Vleck-type ferromagnetism. The positions and the relative amplitudes of two core-level peaks (L3 and L2) of the V EELS spectrum show unambiguous change when the sample is cooled from room temperature to T=10K. Magnetotransport and comparison of the measured and simulated EELS spectra confirm that these changes originate from onset of FM order. Crystal field analysis indicates that in V-doped Sb2Te3, partially filled core states contribute to the FM order. Since van Vleck magnetism is a result of summing over all states, this magnetization of core level verifies the van Vleck-type ferromagnetism in a direct manner.


Descriptors :   *FERROMAGNETIC MATERIALS , ELECTRON ENERGY , MAGNETIC PROPERTIES , ROOM TEMPERATURE , VANADIUM , VERIFICATION


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE