Fingerprinting Triangular-Lattice Antiferromagnet by Excitation Gaps

Abstract

CeCd${}_3$As${}_3$ is a rare-earth triangular-lattice antiferromagnet with large inter-layer separation. Our field-dependent heat capacity measurements at dilution fridge temperatures allow us to trace the field-evolution of the spin-excitation gaps throughout the antiferromagnetic and paramagnetic regions. The distinct gap evolution places strong constraints on the microscopic pseudo-spin model, which, in return, yields a close {\it quantitative} description of the gap behavior. This analysis provides crucial insights into the nature of the magnetic state of CeCd${}_3$As${}_3$, with a certainty regarding its stripe order and low-energy model parameters that sets a compelling paradigm for exploring and understanding the rapidly growing family of the rare-earth-based triangular-lattice systems.

arXiv commentMain Text: 6 pages, 3 figures SM: 19 pages, 23 figures Some clarifications are made relative to previous version

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• Stripe-yz magnetic order in the triangular-lattice antiferromagnet KCeS2
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• The influence of crystalline electric field on the magnetic properties of CeCd3X3 (X = P and As)
• Possible coexistence of short-range resonating-valence-bond and long-range stripe correlations in the spatially anisotropic triangular-lattice quantum magnet Cu${}_2$(OH)${}_3$NO${}_3$
• BaCo${}_2$(AsO${}_4$)${}_2$: Strong Kitaev, After All
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• Dilute Paramagnetism and Non-Trivial Topology in Quasicrystal Approximant Fe${}_4$Al${}_{13}$