Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Topological Semimetals II
TT 20.4: Vortrag
Montag, 12. März 2018, 15:45–16:00, A 053
Three dimensional Dirac semimetal canditate PtBi2 — •Boy Roman Piening1, Thirupathaiah Setti1,2, Christian Blum1, Yevhen Kushnirenko1, Alexander Yaresko3, Sergey Borisenko1, Saicharan Aswartham1, and Bernd Büchner1,4 — 1IFW Dresden, 01069 Dresden, Germany — 2Indian Institute of Science, Bangalore, Karnataka, 560012, India — 3Max-Planck-institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany — 4Technical University Dresden, 01069 Dresden, Germany
From band structure calculations the pyrite-type cubic PtBi2 has been predicted to be a three-dimensional Dirac semimetal, which is supported by experimental studies showing anomalous transport properties such as a non saturating extremely large linear magnetoresistance (XMR). Until now only the trigonal PtBi2 was investigated in respect to electronic structure by ARPES revealing promising linearly dispersive Dirac states. We synthesized cm-sized cubic and trigonal PtBi2 single crystals by selfflux method using different ratios of Pt to Bi in appropriate temperature regions in order to control the phase. For comparison trigonal PtBi2 were grown with a mirror furnace leading to a several cm-long single crystal. Transport measurements, X-ray diffraction and Energy-dispersive spectroscopy confirm the high quality of the crystals which makes them suitable for further investigation. For the first time it was possible to measure the cubic PtBi2 with ARPES.