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20 April 2024

» arxiv » 1903.0056

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Magnons, fractional excitations, and field-induced transitions in $alpha$-RuCl$_3$
Christian Balz ; Paula Lampen-Kelley ; Arnab Banerjee ; Jiaqiang Yan ; Zhilun Lu ; Xinzhe Hu ; Swapnil M. Yadav ; Yasu Takano ; Yaohua Liu ; David A. Tennant ; Mark D. Lumsden ; David Mandrus ; Stephen E. Nagler ;
Date:	28 Feb 2019
Abstract:	An external magnetic field can induce a transition in $alpha$-RuCl$_3$ to a disordered state that is possibly related to the Kitaev quantum spin liquid (QSL). Here we present new field dependent inelastic neutron scattering data showing three distinct regimes of magnetic response. In the low field ordered state the response shows magnon peaks; the intermediate field quantum disordered state shows only continuum scattering, and a high field regime shows sharp magnon peaks at the lower bound of a strong continuum. Measurable dispersion of magnon modes along the $(0,0,L)$ direction implies that three-dimensional interactions are present. Magnetocaloric effect measurements yield thermodynamic evidence for three field driven phase transitions in the measured range. Combining these with other data we construct a $T-B$ phase diagram. The results constrain the range where one might expect to observe QSL behavior in $alpha$-RuCl$_3$.
Source:	arXiv, 1903.0056
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