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Science 21 July 2000:
Vol. 289. no. 5478, pp. 419 - 422
DOI: 10.1126/science.289.5478.419
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Reports
Holes in a Quantum Spin Liquid
Guangyong Xu,1
G. Aeppli,2
M. E. Bisher,2
C. Broholm,13*
J. F. DiTusa,4
C.
D. Frost,5
T. Ito,6
K. Oka,6
R. L. Paul,3
H. Takagi,7
M. M. J. Treacy2
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  and a size controlled by the correlation length of
the quantum liquid can account for the data. The experiment provides a
quantitative impression of the magnetic polarization cloud associated
with holes in a doped transition metal oxide.
1 Department of Physics and Astronomy, Johns
Hopkins University, Baltimore, MD 21218, USA.
2 NEC
Research Institute, 4 Independence Way, Princeton, NJ 08540, USA.
3 National Institute of Standards and Technology
Center for Neutron Research, Gaithersburg, MD 20899, USA.
4 Department of Physics and Astronomy, Louisiana
State University, Baton Rouge, LA 70803, USA.
5 ISIS
Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11
0QX, UK.
6 Electrotechnical Laboratory, Tsukuba 305, Japan.
7 Department of Advanced Materials Science,
Graduate School of Frontier Sciences, University of Tokyo Hongo, Tokyo
113-8656, Japan.
*
To whom correspondence should be addressed. E-mail:
broholm{at}jhu.edu
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Mesoscopic Phase Coherence in a Quantum Spin Fluid.
- G. Xu, C. Broholm, Y.-A. Soh, G. Aeppli, J. F. DiTusa, Y. Chen, M. Kenzelmann, C. D. Frost, T. Ito, K. Oka, et al. (2007)
Science
317, 1049-1052
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