Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 47: Superconductivity: Properties and Electronic Structure 2
TT 47.9: Vortrag
Mittwoch, 22. März 2017, 17:30–17:45, HSZ 103
Paramagnetic Meissner effect in topological superconductor candidate SrxBi2Se3 — •zhiwei wang1, ruixing zhang2, alexey taskin1, huaixin yang2, jianqi li2, and yoichi ando1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2Institute of Physics, Chinese Academy of Science, 100190, Beijing, P. R. China
Single crystals of superconducting SrxBi2Se3 with the actual Sr content up to x = 0.14 have been grown. The highest Tc = 3.12 K has been observerd in x = 0.048 sample in electrical transport measurment and it dereases with the increase of actual Sr content. The highest superconducting volume fraction is close to 100% determined from magnetic susceptibility measurement at 1.75 K. An unexpected paramagnetic Messner effect (PME) has been observed in all measured SrxBi2Se3 samples at lower magnetic fields. We attribute this PME to imhomogeneous microstructure of SrxBi2Se3, which was supported by transmission eletron microscope (TEM) analysis. In addition, resistive transitions under magnetic fields point to an unconventional temperature dependence of the upper critical field Bc2.