DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 54: Correlated Electrons: Complex Oxides and Other Materials

TT 54.5: Vortrag

Donnerstag, 4. April 2019, 10:30–10:45, H22

High-pressure floating-zone growth of LaNiO3 single crystals — •Kaustav Dey, Mahmoud M.Abdel-Hafiez, and Rüdiger Klingeler — Kirchhoff Institute for Physics, Heidelberg University, Germany

LaNiO3 is known to be a correlated metal in the vicinity of a bandwidth controlled metal-insulator transition. A variety of experimental studies on polycrystalline LaNiO3 have indicated it to be a Pauli paramagnetic metal. Recently, the successful growth of LaNiO3 single crystals was published [1,2]. Suprisingly, Guo et. al. have reported that LaNiO3 has an antiferromagnetic metallic ground state [2]. We discuss the successful growth and characterization of centimeter-sized single crystals of LaNiO3 by means of the floating zone technique at oxygen pressures of up to 80 bar. Indeed, magnetisation and specific heat data on several LaNiO3 single crystals grown at 40 bar show the presence of a anomaly in the range 150-160 K similar to what is reported in Ref. [2]. In contrast, no anomaly was observed in the crystals grown at 80 bar in agreement with Ref. [1]. We infer that higher pressure leads to better crystal quality in terms of phase purity and that the anomaly associated with antiferromagnetism reported in LaNiO3 single crystals may not be of intrinsic nature.
J. Zhang et al., Cryst. Growth Des. 17, 2730 (2017)
H. Guo et al., Nat. Comm. 9:43 (2018).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2019 > Regensburg