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Published on: June 7, 2018
Weak-field induced nonmagnetic state in a Co-based honeycomb
Ruidan Zhong1, Tong Gao2, Nai Phuan Ong2
1Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
Researchers studied BaCo2(AsO4)2, a 3d honeycomb magnet, finding that a low magnetic field suppresses magnetic order. This suggests strong frustration and weak non-Kitaev interactions, crucial for exploring Kitaev quantum spin liquids.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
Background:
- Kitaev quantum spin liquid (KQSL) is a quantum state with long-range spin entanglement.
- Candidate materials often exhibit conventional magnetic order due to non-Kitaev interactions obscuring KQSL physics.
- Current research focuses on 4d or 5d transition metals, where strong spin-orbit coupling aids Kitaev physics in magnetic fields.
Purpose of the Study:
- Investigate BaCo2(AsO4)2, a 3d-based layered honeycomb magnet.
- Determine if Kitaev physics is accessible in materials with weak spin-orbit coupling.
- Explore the role of magnetic frustration and non-Kitaev interactions.
Main Methods:
- Experimental studies on BaCo2(AsO4)2.
- Application of controlled magnetic fields.
- Analysis of magnetic ordering and frustration.
Main Results:
- Magnetic order in BaCo2(AsO4)2 is fully suppressed by a low magnetic field.
- The material becomes nonmagnetic under applied field.
- Evidence of strong magnetic frustration and weak non-Kitaev interactions is found.
Conclusions:
- BaCo2(AsO4)2 is a promising system for studying Kitaev physics in 3d magnets.
- Suppression of magnetic order by field is key to accessing exotic quantum states.
- Weak spin-orbit coupling does not preclude interesting magnetic phenomena in these systems.
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