Universal fluctuating regime in triangular chromate pure Heisenberg S=3/2 antiferromagnets

POSTER

Abstract

We report x-ray diffraction, magnetic susceptibility, heat capacity, 1H nuclear magnetic resonance (NMR), and muon spin relaxation (µSR) measurements, as well as band-structure calculations for the frustrated S = 3/2 triangular lattice Heisenberg antiferromagnet (TLHAF) α-HCrO2 (trigonal, space group: R-3m). The intra-layer and inter-layer couplings are estimated to be J/kB ≈ 24 K and J’/kB ≈ 2.8 K, respectively. This compound undergoes a clear magnetic transition at TN ≈ 22.5 K, as seen from the drop in the muon paramagnetic fraction and concurrent anomalies in the magnetic susceptibility and specific heat capacity. Local probes (NMR and µSR) reveal a broad regime with slow fluctuations down to 0.7 TN, this temperature corresponding to the maximum in the µSR relaxation rate and in the NMR wipe-out. The scaling of the NMR and µSR data with respect to J or TN supports a scenario where a crossover from 2D to 3D correlations sets in around 0.7 TN preceded by a typical 2D regime of the TLHAF. From the comparison with NaCrO2 and α-KCrO2, the fluctuating regime and slow dynamics below TN appear to be hallmarks of the TLHAF with ABC stacking. We discuss the role of interlayer frustration which may bear implications to recent spin-liquid candidates with the triangular geometry.

*K.S. and R.N: SERB, India for financial support bearing sanction Grant No. CRG/2019/000960M.P-Z., A.T., N.B.: Work in Augsburg supported by German Research Foundation (DFG) via Project No. 107745057 (TRR80)Y.F.: U.S. Work at the Ames Laboratory supported by Department of Energy, Contract No. DEAC02-07CH11358P.M., F.B.: French Agence Nationale de la Recherche under Grant No. ANR-18-CE30-0022G.S.:Mobility grant P2EZP2-178604 and PALM LabEx grant ANR-10-LABX-0039-PALMA.Z. Slovenian Research Agency through program No. P1-0125 and projects No. BI-US/18-20-064, No. J1-2461, and No. N1-014A.Z.:National High Magnetic Field Laboratory is supported by National Science Foundation through NSF/DMR-1644779

Publication: PHYSICAL REVIEW B 104, 104422 (2021): "Universal fluctuating regime in triangular chromate antiferromagnets"

Presenters

  • Philippe Mendels

    • Université Paris-Saclay
    • Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France
    • Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France
    • Universit?© Paris-Sud 11, Universit?© Pa

Authors

  • Philippe Mendels

    • Université Paris-Saclay
    • Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France
    • Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France
    • Universit?© Paris-Sud 11, Universit?© Pa

  • K. Somesh

    • School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram 695551, India

  • Ramesh Nath

    • School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram 695551, India

  • Alexander Tsirlin

    • University of Augsburg

  • Yuji Furukawa

    • Ames Laboratory, Iowa State University, Ames, Iowa 50011
    • Iowa State University

  • Andrej Zorko

    • Jozef Stefan Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia

  • Gediminas Simutis

    • Universite Paris-Saclay

  • Fabrice Bert

    • Université Paris-Saclay
    • Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France
    • Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France
    • Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, France

  • N. Büttgen

    • Augsburg University

  • Markus Prinz-Zwick

    • Augsburg University