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Fermionic order by disorder in a van der Waals antiferromagnet.
R Okuma1, D Ueta1, S Kuniyoshi1,2
1Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Onna, Okinawa, 904-0495, Japan.
Scientific Reports
|September 18, 2020
Summary
Researchers explored chemical pressure effects on CeTe3, discovering an exotic magnetic rotation. This fluctuation-driven process, observed for the first time in van der Waals materials, enhances magnetism and itinerancy.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- CeTe3 is a van der Waals (vdW) coupled metal ideal for studying itinerant magnetism.
- Investigating chemical pressure effects on Ce3+(4f1) states is crucial but understudied.
- Boosting quantum fluctuation is a key strategy for manipulating magnetic properties.
Purpose of the Study:
- To systematically study the impact of chemical pressure on the magnetic properties of CeTe3.
- To understand the role of quantum fluctuation in driving magnetic phase transitions.
- To explore novel magnetic ordering phenomena in vdW materials.
Main Methods:
- Synthesis of Se-doped single crystals of CeTe3.
- Experimental investigation of magnetic ordering and electronic properties.
- Analysis of magnetic rotation and quantum fluctuation effects.
Main Results:
- Successful growth of a series of Se-doped CeTe3 single crystals.
- Observation of a fluctuation-driven exotic magnetic rotation from easy-axis to hard-axis ordering.
- Demonstration that near-critical magnetism enhances itinerancy and magnetic fluctuation simultaneously.
- Emergence of hard-axis ordering through kinetic energy gain, a self-consistent 'order-by-disorder' process.
- First observation of this order-by-disorder mechanism in a fermionic system within vdW materials.
Conclusions:
- Chemical pressure in CeTe3 induces an unprecedented order-by-disorder magnetic phase transition.
- This finding provides a new platform for visualizing quasiparticle Fermi surface deformation.
- Further tuning of quantum fluctuation in vdW materials may lead to emergent exotic phases.
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