Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/25060
Title: | High Field NMR Investigation of Kitaev Spin Liquid Candidate Cu2IrO3 |
Authors: | Wang, Jiaming |
Advisor: | Imai, Takashi |
Department: | Physics and Astronomy |
Keywords: | Spin Liquid;Kitaev;Iridate;NMR |
Publication Date: | 2019 |
Abstract: | The search for quantum spin liquids (QSLs) introduces some of the most challenging and interesting problems in contemporary physics. The recently discovered iridate Cu2IrO3,which contains a honeycomb lattice of Ir4+ions with effective spin 1/2 coupled by frustrated Ising interactions, presents itself as a promising candidate for a Kitaev QSL. In this study, we use nuclear magnetic resonance (NMR), a spectroscopic technique based on the energy levels of nuclear spin states, to probe the intrinsic spin excitations of Cu2IrO3. By measuring the NMR frequency shift of 63Cu from 4.2 K to 298 K,we demonstrate that its spin susceptibility χ spin behaves nearly identically to its parent compound Na2IrO3, without showing evidence of magnetic ordering at low temperatures. We showed that the upturn of bulk susceptibility χ below T=50 K is due to the contribution of defect spins. The hyperfine coupling constant Ahf between Cu and Ir4+was also estimated by comparing the Knight shift 63K to χ |
URI: | http://hdl.handle.net/11375/25060 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Wang_Jiaming_2019November_Masters.pdf | 2.01 MB | Adobe PDF | View/Open |
Items in MacSphere are protected by copyright, with all rights reserved, unless otherwise indicated.