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Incommensurate Magnetism Near Quantum Criticality in CeNiAsO
Shan Wu1,2, W A Phelan1, L Liu3
1Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Physical Review Letters
|May 31, 2019
Summary
We discovered incommensurate magnetism in CeNiAsO near quantum criticality. This material exhibits two magnetic transitions, transitioning from a spin density wave to a coplanar commensurate order.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- Understanding quantum criticality is crucial for developing novel electronic materials.
- Cerium-based intermetallic compounds are known for their complex magnetic behaviors.
Purpose of the Study:
- To investigate the magnetic properties of CeNiAsO near quantum criticality.
- To determine the nature of magnetic ordering and phase transitions in this material.
Main Methods:
- Neutron scattering experiments were employed to probe magnetic structures.
- Zero-field muon spin rotation (μSR) was used to investigate magnetic ordering.
- Inelastic neutron scattering determined the ground state moment.
Main Results:
- Discovery of incommensurate magnetism with a wave vector k=(0.44(4),0,0) below T_{N1}=8.7(3) K.
- Observation of coplanar commensurate order below T_{N2}=7.6(3) K, with a reduced magnetic moment.
- Commensurate order was found to exist only for low phosphorus concentrations (x≤0.1) in CeNiAs_{1-x}P_{x}O.
Conclusions:
- The transition at x_{c}=0.4(1) is inferred to be between an incommensurate longitudinal spin density wave and a paramagnetic Fermi liquid.
- The study reveals complex magnetic phase transitions in CeNiAsO, influenced by quantum criticality.
- The findings contribute to the understanding of magnetism in cerium compounds near the quantum critical point.
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