Spin-liquid behavior of the three-dimensional magnetic system Ba3NiIr2O9 with S=1
Source abstract
Abstract
The quantum spin liquid (QSL) is an exotic phase of magnetic materials where the spins continue to fluctuate without any symmetry breaking down to zero temperature. Among the handful reports of QSL with spin $S\ensuremath{\ge}$ 1, examples with magnetic ions on a three-dimensional (3D) magnetic lattice are extremely rare since both larger spin and higher dimension tend to suppress quantum fluctuations. In this work, we offer a new strategy to achieve 3D QSL with high spin by utilizing two types of transition metal ions; both are magnetically active but located at crystallographically inequivalent positions. We design a 3D magnetic system ${\mathrm{Ba}}3{\mathrm{NiIr}}2{\mathrm{O}}9$ consisting of interconnected corner-shared ${\mathrm{NiO}}6$ octahedra and face-shared ${\mathrm{Ir}}2{\mathrm{O}}9$ dimer, both having triangular arrangements in a-b plane. X-ray absorption spectroscopy measurements confirm the presence of ${\mathrm{Ni}}2+$ ($S=1)$. Our detailed thermodynamic and magnetic measurements reveal that this compound is a realization of gapless QSL state down to at least 100 mK. Ab initio calculations find a strong magnetic exchange between Ir and Ni sublattices and in-plane antiferromagnetic coupling between the dimers, resulting in dynamically fluctuating magnetic moments.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Condensed Matter Physics · Physics of Superconductivity and Magnetism · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Physics, Indian Institute of Science, Bengaluru 560012, India
Department of Physics, Bennett University, Greater Noida 201310, Uttar Pradesh, India
UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, India
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, United Kingdom
Funding
Indian Space Research Organisation · Indian Institute of Science · Infosys Foundation · Department of Science and Technology, Ministry of Science and Technology · Jawaharlal Nehru Centre for Advanced Scientific Research · U.S. Department of Energy · Argonne National Laboratory · Science and Technology Facilities Council · UGC-DAE Consortium for Scientific Research, University Grants Commission
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