Holes in a Quantum Spin Liquid

Abstract

Magnetic neutron scattering provides evidence for nucleation of antiferromagnetic droplets around impurities in a doped nickel-oxide based quantum magnet. The undoped parent compound contains a spin liquid with a cooperative singlet ground state and a gap in the magnetic excitation spectrum. Calcium doping creates excitations below the gap with an incommensurate structure factor. We show that weakly interacting antiferromagnetic droplets with a central phase shift of $\pi$ and a size controlled by the correlation length of the quantum liquid can account for the data. The experiment provides a first quantitative impression of the magnetic polarization cloud associated with holes in a doped transition metal oxide.

arXiv commenttex file for 5 pages and four figures in separated jpg files

References in corpus (6)

• Melting of Quasi-Two-Dimensional Charge Stripes in La5/3Sr1/3NiO4
• Random Bonds and Topological Stability in Gapped Quantum Spin Chains
• Impurities in $s=1$ Heisenberg Antiferromagnets
• Spin Dynamics of Hole Doped ${\mathrm{Y}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{a}}_{\mathrm{x}}\mathrm{BaNi}{\mathrm{O}}_5$
• Propagating S=1/2 particles in S=1 Haldane gap systems
• Weak-Coupling Approach to Hole-Doped S=1 Haldane Systems

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