[Zurück]

Sami Dzsaber, L. Prochaska, A. Sidorenko, Gaku Eguchi, R. Svagera, M. Waas, A. Prokofiev, Q. Si, S. Paschen:
"Kondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling";
Vortrag: Seminarvortrag Hiroshima University, Department of Physics, Hiroshima University (eingeladen); 17.05.2018.

Recent theoretical studies of topologically nontrivial electronic states have pointed to the importance of spin-orbit coupling (SOC) for stabilizing these states. The assertion is held even in Kondo insulators, however, its systematic experimental study remains elusive [1, 2].
Here we present the successful growth of the substitution series Ce3Bi4(Pt1-xPdx)3 (0≤x≤1) of the archetypal noncentrosymmetric Kondo insulator Ce3Bi4Pt3. The Pt-Pd substitution is isostructural, isoelectronic, and isosize. It therefore is likely to leave the Kondo coupling and the chemical potential essentially unchanged. By contrast, the large mass difference between the 5d element Pt and the 4d element Pd leads to a large difference in the SOC, which thus is the dominating tuning parameter intheseries. WithincreasingxweobserveaKondoinsulatortosemimetaltransition, demonstrating an unprecedented drastic influence of the SOC. The fully substituted end compound Ce3Bi4Pd3 show thermodynamic signatures of a recently predicted Weyl-Kondo semimetal.