# Spinon confinement and a sharp longitudinal mode in Yb2Pt2Pb in magnetic fields

@article{Gannon2019SpinonCA, title={Spinon confinement and a sharp longitudinal mode in Yb2Pt2Pb in magnetic fields}, author={William J.F. Gannon and Igor A. Zaliznyak and L. S. Wu and Adrian E. Feiguin and Alexei M. Tsvelik and Franz Demmel and Yiming Qiu and John R. D. Copley and M. S. Kim and Meigan C. Aronson}, journal={Nature Communications}, year={2019}, volume={10} }

The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the ground state is Néel ordered. Here, we report high resolution neutron scattering experiments, which reveal how a magnetic field closes this gap and drives the spin chains in Yb2Pt2Pb to a critical, disordered Luttinger-liquid state. In Yb2Pt2Pb the…

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