Disordered ground state in the spin-orbit coupled Jeff = 1/2 distorted honeycomb magnet BiYbGeO5

  • We delineate quantum magnetism in the strongly spin-orbit coupled distorted honeycomb lattice antiferromagnet BiYbGeO5. Our magnetization and heat capacity measurements reveal that its low-temperature behavior is well described by an effective Jeff=12 Kramers doublet of Yb3+. The ground state is nonmagnetic with a tiny spin gap. Temperature-dependent magnetic susceptibility, magnetization isotherm, and heat capacity can be modeled well assuming isolated spin dimers with anisotropic exchange interactions JZ≃2.6 K and JXY≃1.3 K. Heat capacity measurements backed by muon spin relaxation suggest the absence of magnetic long-range order down to at least 80 mK both in zero field and in applied fields. This sets BiYbGeO5 apart from Yb2Si2O7, with its unusual regime of magnon Bose-Einstein condensation, and suggests negligible interdimer couplings, despite only a weak structural deformation of the honeycomb lattice.

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Author:S. Mohanty, S. S. Islam, N. Winterhalter-Stocker, Anton JescheORCiDGND, G. Simutis, Ch. Wang, Z. Guguchia, J. Sichelschmidt, M. Baenitz, Alexander A. TsirlinORCiDGND, Philipp GegenwartORCiDGND, R. Nath
Frontdoor URLhttps://opus.bibliothek.uni-augsburg.de/opus4/108548
Parent Title (English):Physical Review B
Publisher:American Physical Society (APS)
Year of first Publication:2023
Publishing Institution:Universität Augsburg
Release Date:2023/10/20
First Page:134408
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik VI
Forschungsprojekte / TRR360 Constrained Quantum Matter
Forschungsprojekte / TRR360 Constrained Quantum Matter / B3
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):Deutsches Urheberrecht