A novel low temperature dynamic correlated paramagnet on a randomly diluted lattice

ORAL

Abstract

The presence of interacting spins on a lattice could lead to magnetically ordered states. However, magnetic frustration arising from competing exchange interactions could lead to such orderings being strongly suppressed, leading to quantum spin liquid-like states. An alternate approach to realize such exotic ground states is to introduce sufficient magnetic disorder in the lattice. Combining the two approaches, we explore a frustrated triangular lattice in presence of an extensive disorder such that the possibility of both spin liquid and spin glass states exist. Y2CuTiO6 has magnetically coupled spin- ½ Cu2+ on a triangular lattice in which 50% of the sites are randomly replaced by nonmagnetic Ti4+ atoms. We establish [1] that this system does not achieve either a magnetic ordering or a pure glassy state down to 50 mK, though the magnetic interaction strength is nearly 3000 times larger than this temperature. Various experiments and specific scaling behaviours of thermodynamic properties with temperature and magnetic fields suggest that the system remains in a disorder driven, dynamic cooperative paramagnetic state, opening new possibilities to explore the field of frustrated magnetism aided by disorder.

[1] S. Kundu, A. Hossain et al., Phys. Rev. Lett. 125, 117206 (2020)

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Presenters

  • Akmal Hossain

    • Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India

Authors

  • Akmal Hossain

    • Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India

  • S. Kundu

    • Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India

  • Pranava Sivakumar

    • Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India

  • Ranjan Das

    • Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India

  • M. Baenitz

    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

  • Peter J Baker

    • ISIS Pulsed Neutron and Muon Facility, STFC Rutherford Appleton Laboratory
    • ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX110QX, United Kingdom
    • ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, UK

  • Jean-Christophe Orain

    • Paul Scherrer Institute, Bulk MUSR group, LMU 5232 Villigen PSI, Switzerland
    • Laboratory for Muon spin spectroscopy, Paul Scherrer Institute, Villigen, Switzerland

  • D. C. Joshi

    • Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden

  • Roland Mathieu

    • Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden

  • Priya Mahadevan

    • S. N. Bose National Center for Basic Sciences, Block-JD, Salt Lake, Kolkata-700106, India
    • S N Bose National Center for Basic Science
    • Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences

  • Sumiran Pujari

    • Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
    • Department of Physics, Indian Institute of Technology Bombay, Mumbai, MH 400076, India
    • Physics, Indian Institute of Technology Bombay

  • Subhro Bhattacharjee

    • International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Bengaluru 560089, India

  • Avinash Mahajan

    • Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India

  • Dipankar Das Sarma

    • Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India
    • Solid State and Structural Chemistry Unit, Indian Institute of Science