University of Birmingham > Talks@bham > Theoretical Physics Seminars > Exploring a New Family of S = ½ Kagomé Antiferromagnets

Exploring a New Family of S = ½ Kagomé Antiferromagnets

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Dr Hannah Price.

Materials constructed from kagomé layers of antiferromagnetically coupled S = ½ moments are highly prized as they offer a unique opportunity to explore elusive quantum spin liquid (QSL) states.[1] Recently, the Cu^(2+)-based mineral known as Zn-doped barlowite, ZnCu_3(OH)_6FBr, has shown promise as a new realisation of the QSL state.[2] Despite this interest, the crystal and magnetic structures of the parent material barlowite, Cu_4(OH)_6FBr, are poorly understood with several conflicting reports in the literature.[3-5] In this seminar, I will introduce these developments in the field of highly frustrated magnetism before presenting our comprehensive neutron diffraction studies of barlowite. In doing so, I will discuss the intriguing structural phase transition we observe in this material at T = 250 K, and clarify the nature of the magnetic ground state below TN = 15 K.[6] I will also discuss our efforts to control the nature of the structural phase transition within a new family compounds through exchange of the halide ions in barlowite. In addition, I will show that we can tune the magnetic ground state of barlowite from antiferromagnetic order to quantum disorder upon Zn-doping though muon spectroscopy measurements supported by density-functional theory.[7]

[1] Broholm et al., Science 367, 263 (2020). [2] Han, Singleton, Schlueter, Phys. Rev. Lett. 113, 227203 (2014). [3] Feng et al., Phys. Rev. B 98 , 155127 (2018). [4] Pasco et al., Phys. Rev. Mater. 2, 0444061 (2018). [5] Smaha et al., J. Solid State Chem. 268, 123-129 (2018). [6] Tustain et al., Phys. Rev. Mater. 2, 111405® (2018). [7] Tustain et al., npj Quantum Materials 5, 74 (2020).

This talk is part of the Theoretical Physics Seminars series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.


Talks@bham, University of Birmingham. Contact Us | Help and Documentation | Privacy and Publicity.
talks@bham is based on from the University of Cambridge.