Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Focus Session: Spectroscopy of Quantum Spin Liquids
TT 15.2: Hauptvortrag
Montag, 7. März 2016, 15:30–16:00, H20
Proximate Kitaev quantum spin liquid behavior in α-RuCl3 — •Stephen Nagler — Quantum Condensed Matter Division, Oak Ridge National Laboratory
The magnetic semiconductor α-RuCl3 is composed of very weakly coupled honeycomb layers of edge-sharing RuCl6 octahedra. The Ru3+ ion has 5d electrons in a low spin state, and the system is expected to have an effective J = 1/2 single ion ground state with an interacting spin Hamiltonian containing Kitaev-like terms. Inelastic neutron scattering on powders and single crystals has been used to determine the energy scale of the magnetic interactions and the overall form of the magnetic fluctuations. The results indicate that the Kitaev term is significant. Moreover, detailed measurements of the response show evidence for the fractionalized excitations that are characteristic of the Kitaev Quantum Spin-liquid.
Research using ORNL neutron scattering facilities is supported by the US Department of Energy, Division of Scientific User Facilities.