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Foronda FR, Lang F, Möller JS, et al. Anisotropic local modification of crystal field levels in Pr-based pyrochlores: a muon-induced effect modeled using density functional theory. Phys Rev Lett. 2015;114(1):017602doi: 10.1103/PhysRevLett.114.017602.
Foronda, F. R., Lang, F., Möller, J. S., Lancaster, T., Boothroyd, A. T., Pratt, F. L., Giblin, S. R., Prabhakaran, D., & Blundell, S. J. (2015). Anisotropic local modification of crystal field levels in Pr-based pyrochlores: a muon-induced effect modeled using density functional theory. Physical review letters, 114(1), 017602. https://doi.org/10.1103/PhysRevLett.114.017602
Foronda, F R, et al. "Anisotropic local modification of crystal field levels in Pr-based pyrochlores: a muon-induced effect modeled using density functional theory." Physical review letters vol. 114,1 (2015): 017602. doi: https://doi.org/10.1103/PhysRevLett.114.017602
Foronda FR, Lang F, Möller JS, Lancaster T, Boothroyd AT, Pratt FL, Giblin SR, Prabhakaran D, Blundell SJ. Anisotropic local modification of crystal field levels in Pr-based pyrochlores: a muon-induced effect modeled using density functional theory. Phys Rev Lett. 2015 Jan 09;114(1):017602. doi: 10.1103/PhysRevLett.114.017602. Epub 2015 Jan 06. PMID: 25615502.
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Phys Rev Lett. 2015 Jan 09;114(1):017602. doi: 10.1103/PhysRevLett.114.017602. Epub 2015 Jan 06.

Anisotropic local modification of crystal field levels in Pr-based pyrochlores: a muon-induced effect modeled using density functional theory.

Physical review letters

F R Foronda, F Lang, J S Möller, T Lancaster, A T Boothroyd, F L Pratt, S R Giblin, D Prabhakaran, S J Blundell

Affiliations

  1. Oxford University Department of Physics, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom.
  2. Durham University, Centre for Materials Physics, South Road, Durham DH1 3LE, United Kingdom.
  3. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom.
  4. School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom.

PMID: 25615502 DOI: 10.1103/PhysRevLett.114.017602

Abstract

Although muon spin relaxation is commonly used to probe local magnetic order, spin freezing, and spin dynamics, we identify an experimental situation in which the measured response is dominated by an effect resulting from the muon-induced local distortion rather than the intrinsic behavior of the host compound. We demonstrate this effect in some quantum spin ice candidate materials Pr(2)B(2)O(7) (B=Sn, Zr, Hf), where we detect a static distribution of magnetic moments that appears to grow on cooling. Using density functional theory we show how this effect can be explained via a hyperfine enhancement arising from a splitting of the non-Kramers doublet ground states on Pr ions close to the muon, which itself causes a highly anisotropic distortion field. We provide a quantitative relationship between this effect and the measured temperature dependence of the muon relaxation and discuss the relevance of these observations to muon experiments in other magnetic materials.

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