Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co 2 TiGe.

Autor:	Dulal RP; Department of Physics, The Catholic University of America, Washington, DC, 20064, USA.; The Vitreous State Laboratory, The Catholic University of America, Washington, DC, 20064, USA., Dahal BR; Department of Physics, South Dakota State University, Brookings, SD, 57007, USA., Forbes A; Department of Physics, The Catholic University of America, Washington, DC, 20064, USA.; The Vitreous State Laboratory, The Catholic University of America, Washington, DC, 20064, USA., Bhattarai N; Department of Physics, The Catholic University of America, Washington, DC, 20064, USA.; The Vitreous State Laboratory, The Catholic University of America, Washington, DC, 20064, USA., Pegg IL; Department of Physics, The Catholic University of America, Washington, DC, 20064, USA.; The Vitreous State Laboratory, The Catholic University of America, Washington, DC, 20064, USA., Philip J; Department of Physics, The Catholic University of America, Washington, DC, 20064, USA. philip@cua.edu.; The Vitreous State Laboratory, The Catholic University of America, Washington, DC, 20064, USA. philip@cua.edu.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2019 Mar 04; Vol. 9 (1), pp. 3342. Date of Electronic Publication: 2019 Mar 04.
DOI:	10.1038/s41598-019-39037-0
Abstrakt:	Several cobalt-based Heusler alloys have been predicted to exhibit Weyl Semimetal behavior due to time reversal symmetry breaking. Co 2 TiGe is one of the predicted ferromagnetic Weyl semimetals. In this work, we report weak localization and small anomalous Hall conductivity in half-metallic Co 2 TiGe thin films grown by molecular beam epitaxy. The longitudinal resistivity shows semimetallic behavior. Elaborate analysis of longitudinal magnetoconductance shows the presence of a weak localization quantum correction present even up to room temperature and reduction in dephasing length at lower temperature. Negative longitudinal magnetoresistance is observed from 5 to 300 K, but at 300 K magnetoresistance becomes positive above 0.5 T magnetic field. The anomalous Hall effect has been investigated in these thin films. The measured anomalous Hall conductivity decreases with increasing temperature, and a small anomalous Hall conductivity has been measured at various temperatures which may be arising due to both intrinsic and extrinsic mechanisms.
Databáze:	MEDLINE
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