R. L. Paul

Publications (1)0 Total impact

• Source

  Available from: Christopher D Frost

  Article: Holes in a Quantum Spin Liquid

  Guangyong Xu, G Aeppli, M. E. Bisher, C. Broholm, J. F. DiTusa, C D Frost, T Ito, K Oka, R. L. Paul, H Takagi, M. M. J. Treacy
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  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.
  03/2001;