Dilution-induced ground state selection in the Seff=1/2 XY pyrochlore antiferromagnet Er2Ti2O7
Er2Ti2O7 is the most prominent candidate for order-by-disorder, a ground state selection mechanism whereby magnetic order is selected by purely quantum mechanical effects. However, one alternative scenario exists that could also possibly explain the ground state selection in Er2Ti2O7. We propose an experiment which aims to find conclusive evidence of the order-by-disorder in a derivative of Er2Ti2O7 diluted with 20% non-magnetic yttrium. Theoretical works have shown that if a change of ordered state occurs in the diluted sample, it is strongly in favor of the order-by-disorder scenario. However, the change in ordered state can only be directly observed with polarized neutron diffraction, which we propose to carry out using the D3 spectrometer and CRYOPAD.
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GAUDET Jonathan; Bruce D. Gaulin; E. Kermarrec; PETIT Sylvain; STUNAULT Anne and Cissy Suen. (2017). Dilution-induced ground state selection in the Seff=1/2 XY pyrochlore antiferromagnet Er2Ti2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-54-236
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