Yan, X., Eguchi, G., Zocco, D. A., Dzsaber, S., Taupin, M., Luznik, M., Rogl, P. F., Giester, G., Waas, M., Svagera, R., Bühler-Paschen, S., & Prokofiev, A. (2022, July 26). Single crystal growth and characterization of Weyl-Kondo semimetal Ce3Bi4Pd3 [Poster Presentation]. 7th European Conference on Crystal Growth (ECCG7), Paris, France, France. http://hdl.handle.net/20.500.12708/154115
Weyl-Kondo semimetal, Crystal growth in flux, Crystal structure
en
Abstract:
The search for topological insulator/semimetal in strongly correlated systems represents an exciting topic in condensed matter physics. Recently, noncentrosymmetric Ce3Bi4Pd3 has been considered as the first Weyl-Kondo semimetal candidate, which attracted remarkable attention [1]. Here we present the single crystal growth of Ce3Bi4Pd3 as well as its characterization by X-ray powder diffraction (XRD), single crystal X-ray diffraction (SCXD), energy dispersive X-ray spectroscopy (EDX) and Laue measurements. The pseudo-binary phase diagram CePd-Bi was established by differential thermal analysis (DTA). Based on this diagram single crystals were grown using Bi or Bi/Pb flux either by slow cooling technique or by modified Bridgman method. The physical properties of single crystals are sensitive to growth conditions, including the flux type, the initial composition, and the temperature profile. This is reflected by contradictory conclusions on the ground state of this material in the literature [2,3]. The quality of crystals was found to be determined by various degree of Pd deficiency. Based on the combined analyses of the SCXD, XRD, and EDX data we confirmed that the Pd deficiency is realized mainly through Pd vacancies Ce3Bi4Pd3-. Systematic variations of low temperature magnetic susceptibility and specific heat on Pd vacancy were observed. Various techniques to control the vacancy content in Ce3Bi4Pd3- are reported. [1] S. Dzsaber, L. Prochaska, A. Sidorenko, G. Eguchi, R. Svagera, M. Wass, A. Prokofiev, Q. Si, and S. Paschen, PRL, 2017, 118, 246601: 1-6. [2] S. Dzsaber, X. Yan, M. Taupin, G. Eguchi, A. Prokofiev, T. Shiroka, P. Blaha, O. Rubel, S.E. Grefe, H-H, Lai, Q. Si, and S. Paschen, PNAS, 2021, 118, e2013386118: 1-8. [3] S.K. Kushwaha, M.K. Chan, J. Park, S.M. Thomas, E.D. Bauer, J.D. Thompson, F. Ronning, P.F.S. Rosa, and N. Harrison, Nat. Commun., 2019, 5487: 1-9. Acknowledgments: The authors acknowledge financial support from the Austrian Science Fund (FWF Grants exSOC I4047-N27, P29279-N27, and P29296-N27)