Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.15: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

⁷Li and ²³Na NMR measurements on (Na_0.75Li_0.25)₂IrO₃ — •Tusharkanti Dey¹, Markus Prinz-Zwick², Martina Schädler², Friedrich Freund¹, Soham Manni¹, Avinash Mahajan^2,3, Norbert Büttgen², and Philipp Gegenwart¹ — ¹EP-VI, Electronic Correlations and Magnetism, University of Augsburg, Germany — ²EP-V, Electronic Correlations and Magnetism, University of Augsburg, Germany — ³IIT Bombay, India

An experimental realization of the proposed Kitaev spin-liquid phase in Na₂IrO₃ and Li₂IrO₃ is still a big challenge. Efforts to suppress the magnetic ordering in Na₂IrO₃ by substituting isoelectronic Li in the Na site was partially successful [1, 2]. An earlier report [1] suggests the optimum doping to be 25% where the magnetic ordering is suppressed to 6 K while the structure remains undisturbed. Interestingly, for the (Na_0.75Li_0.25)₂IrO₃ sample Na and Li are crystallographically ordered where the Li ions reside at the centre of the Ir honeycombs [1]. We have studied the material using both ⁷Li and ²³Na NMR. Results of our spectra, spin-lattice and spin-spin relaxation measurements will be discussed in the poster.
S. Manni, S. Choi, I. I. Mazin, R. Coldea, M. Altmeyer,

H. O. Jeschke, R. Valenti, and P. Gegenwart,

Phys. Rev. B 89, 245113 (2014)
G. Cao, T. F. Qi, L. Li, J. Terzic, V. S. Cao, S. J. Yuan, M. Tovar,

G. Murthy, and R. K. Kaul, Phys. Rev. B 88, 220414(R) (2013)