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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.70: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Magnetic Majorana fermions observed in the diluted Kitaev materials α-Ru1-xIrxCl3 — •Youngsu Choi^1,2, Dirk Wulferding^1,3, Peter Lemmens^1,3, Seunghwan Do², and Kwang-Yong Choi² — ¹IPKM, TU-BS, Braunschweig, Germany — ²Chung-Ang Univ., Seoul, Korea — ³LENA, TU-BS, Braunschweig, Germany

A Kitaev honeycomb lattice is a paradigmatic model that hosts Kitaev spin liquid and Majorana fermions. However, their experimental identification remains elusive in real Kitaev materials as non-Kitaev terms often induce a magnetically ordered state. We introduce spin vacancies to overcome this deadlock. In the diluted Kitaev materials α-Ru1-xIrxCl3, Raman scattering measurements uncover that moderate spin vacancies destabilize the zigzag antiferromagnetic order towards a short-range ordered state, while well-defined Majorana fermion excitations emerge under sizable dilutions. Furthermore, a structural evolution with Ir content is characterized by studying phonon modes.

Work supported by the Quantum- and Nanometrology initiative QUANOMET within project NL-4, the NTH School Contacts in Nanosystems and Korea NRF Grants (No. 2012-046138).