Growth and characterization of CrTe2/PtTe2 bilayers and alloys
Bo-Han Chen1*, Guan-Yu Chen1, Han-Yu Hsu1, Yung-Sung Chen1, Jhen-Honng Yen1, Cha-Her Lin1, Chen-Yu Lien1, Yu-Chen Chang1, Li-Wei Tu1, Paritosh Vilas Wadekar1
1Department of Physics and Center of Crystal Research, National Sun Yat-Sen University, Kaohsiung, Taiwan
* Presenter:Bo-Han Chen,
Transition metal ditellurides (XTe2) shown novel properties based on the transition metal. For example, if X = Pt, then PtTe2, is a topological semimetals with an electronic band structure showing massless Dirac fermions and diamagnetic behavior. If X = Cr, then CrTe2 is an intrinsic ferromagnetic metal, with a colossal anomalous Hall effect, but lacks Dirac fermions. Inducing ferromagnetism in a topological semimetal could be promising for spin based quantum information studies. So, where we study the growth and characterization of CrTe2, PtTe2, PtTe2/CrTe2, and Pt1-xCrxTe2 alloys. These samples were grown on single crystalline sapphire substrates using atmospheric pressure chemical vapor deposition (APCVD) processes. By tellurization of metallic seed layers of controlled thickness and orientations, we were successful in getting the desired crystalline phases. The samples were characterized using a host of analysis techniques such as X-ray diffraction and reflectivity, Raman spectroscopy, X-ray photoelectron spectroscopy, and magnetometry measurements. The effect of the growth conditions on the crystallinity, morphology, uniformity on the magnetic properties are reported.

Keywords: 2D materials, Dirac semimetal, ferromagnetism, APCVD