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Multiple fermion scattering in the weakly coupled spin-chain compound YbAlO3
S E Nikitin1,2,3, S Nishimoto4,5, Y Fan6,7
1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany. stanislav.nikitin@psi.ch.
Nature Communications
|June 15, 2021
Summary
The Heisenberg spin chain compound YbAlO3 exhibits Umklapp scattering, stabilizing an incommensurate spin-density wave order under magnetic fields. This leads to multiple coherent fermion scattering and satellite formation, offering insights into quantum materials.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Materials Science
Background:
- The Heisenberg antiferromagnetic spin-1/2 chain is a foundational model in quantum mechanics.
- Its low-energy physics is analogous to Tomonaga-Luttinger liquids of spinless fermions in 1D metals.
Purpose of the Study:
- Investigate the Heisenberg spin-chain compound YbAlO3.
- Explore the effects of weak interchain coupling on fermion behavior under magnetic fields.
Main Methods:
- Theoretical investigation of the Heisenberg spin-chain compound YbAlO3.
- Analysis of Umklapp scattering and spin-density wave formation.
- Utilizing neutron diffraction as a proxy to study coherent multiple scattering.
Main Results:
- Weak interchain coupling induces Umklapp scattering between left- and right-moving fermions.
- An incommensurate spin-density wave order at q=2kF is stabilized under finite magnetic fields.
- Coherent multiple scattering of fermions leads to satellite formation at integer multiples of the fundamental wavevector Q=nq.
Conclusions:
- The study provides profound insights into bandstructure control for emergent fermions in quantum materials.
- Demonstrates the application of neutron diffraction for investigating coherent multiple scattering phenomena in metals via quantum magnetic systems.
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