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Title: | Gapless quantum spin liquid in the π=1 4π4 honeycomb material Cu3β’LiRu2β’O6 |
Authors: | Bachhar, Sanjay PISTAWALA, NASHRA Kundu, S Barik, Maneesha Baenitz, M. Sichelschmidt, JΓΆrg Yokoyama, Koji Khuntia, P. SINGH, SURJEET Mahajan, A. V. Dept. of Physics |
Keywords: | Quantum spin liqu Specific heat Nuclear magnetic resonance 2025-MAR-WEEK1 TOC-MAR-2025 2025 |
Issue Date: | Mar-2025 |
Publisher: | American Physical Society |
Citation: | Physical Review B, 111, L10040. |
Abstract: | We report on a novel gapless quantum spin liquid in the π=1 honeycomb system Cu3β’LiRu2β’O6 with Ru4+ (4β’π4) where moments remain dynamic down to 50 mK. Heat capacity measurements show no sign of magnetic ordering down to 60 mK inspite of a Curie-Weiss temperature, πCW=β222 K, indicating a strong antiferromagnetic interaction. In zero field, the magnetic heat capacity πΆπ shows a linear π dependence with the Sommerfeld coefficient πΎ=107 mJ/mol K2, which is much larger than that found in typical Fermi liquids. Our local probe 7 Li nuclear magnetic resonance (NMR) measurements find a significant temperature-independent 7 Li NMR shift (and hence a nonzero spin susceptibility) at low temperature (π) and a linear π variation of the 7 Li NMR spin-lattice relaxation rate 1/π1 at low π reminiscent of fermionic excitations. Muon spin relaxation (πβ’SR) measurements detect neither long-range ordering nor spin freezing down to 50 mK, and the temperature variation of the muon depolarization rate π shows a gradual increase with decreasing temperature and a leveling off below about 1 K, evincing a persistent spin dynamics common to several spin liquid candidates. Our results provide strong signatures of a quantum spin liquid in the titled honeycomb material. |
URI: | https://doi.org/10.1103/PhysRevB.111.L100403 http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/9447 |
ISSN: | 2469-9969 2469-9950 |
Appears in Collections: | JOURNAL ARTICLES |
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