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Fingerprinting triangular-lattice antiferromagnet by excitation gaps

  • Author(s): Avers, KE;
  • Maksimov, PA;
  • Rosa, PFS;
  • Thomas, SM;
  • Thompson, JD;
  • Halperin, WP;
  • Movshovich, R;
  • Chernyshev, AL
  • et al.
Abstract

CeCd3As3 is a rare-earth triangular-lattice antiferromagnet with large interlayer 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 pseudospin model, which, in return, yields a close quantitative description of the gap behavior. This analysis provides crucial insights into the nature of the magnetic state of CeCd3As3, 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.

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