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  • Letter
  • Open Access

Finite spinon density of states in triangular lattice delafossite TlYbSe2

Bishnu P. Belbase1,*, Arjun Unnikrishnan1,2,*,†,‡, Shi Feng3,4, Eun Sang Choi5, Johannes Knolle3,4,6, and Arnab Banerjee1,§

  • *These authors contributed equally to this work.
  • †Contact author: arjunpookad@gmail.com
  • ‡Present address: Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg 86159, Germany.
  • §Contact author: arnabb@purdue.edu
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Phys. Rev. Research 8, L032021 – Published 11 August, 2026

DOI: https://doi.org/10.1103/tc4h-cq9c

Abstract

We introduce the rare-earth delafossite compound TlYbSe2—extending the search for quantum spin liquids in frustrated triangular lattice magnets. While the dc magnetization suggests magnetic exchange interactions on the order of several kelvin, the zero-field ac magnetization and heat capacity measurements reveal no signs of long-range magnetic order down to 20 mK, indicating a quantum-disordered ground state. We observe a spin-freezing transition near ∼30 mK at zero field that is suppressed by an applied magnetic field of ∼0.02 T. A broad anomaly in the heat capacity measurements between 2 and 5 K is indicative of short-range spin correlations. Below 350 mK, we observe a robust linear temperature dependence of the heat capacity, accompanied by the complete absence of long-range order at low fields. We propose that a phenomenological theory, based on the interplay between spinons and thermally excited gauge flux excitations, can account for the linear temperature dependence of the heat capacity, and could be widely applicable to similar critical quantum spin liquid candidate materials. The results establish the low-temperature, low-field regime of TlYbSe2 as a prime candidate for field-tunable triangular quantum spin liquid behavior and highlight the importance of thermally excited gauge field excitations.

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Phys. Rev. Research 8, L032021– Published 11 August, 2026
  • Received 9 September 2025
  • Revised 16 December 2025
  • Accepted 8 July 2026
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