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Séminaire Magnétisme Frustré

Jeudi 27 Novembre à 14h00,
Salle Remy Lemaire, K223

Oratrice : Solène Guitteny (LLB, Saclay)
"Neutron scattering study of the quantum spin ice candidate Pr2Zr2O7"

Sol-ene Guitteny 1, Julien Robert 1, Sylvain Petit 1, Elsa Lhotel 3, Arsen Goukassov 1,Isabelle Mirebeau1, Pierre Bonville 2, Claudia Decorse 4, Monica Ciomaga Hatnean 5, Geetha Balakrishnan 5, Eric Ressouche 6, Jacques Ollivier 7, Hannu Mutka 7
1 CEA, Centre de Saclay, DSM/IRAMIS/ Laboratoire L-eon Brillouin, F-91191 Gif-sur-Yvette, France ;
2 CEA, Centre de Saclay, DSM/IRAMIS/ Service de Physique de l’Etat Con- dens-e, F-91191 Gif-Sur-Yvette, France ;
3 Institut N-eel C.N.R.S Universite Joseph Fourier, BP 166, 38042, Grenoble, France ;
4 LPCES, Universit-e Paris-Sud, 91405, Orsay, France ;
5 Department of Physics, University of Warwick, Coventry CV4 7AL, UK ; 6 CEA, Centre de Grenoble, CEA/INAC/ MDN, 38054 Grenoble, France ; 7 Institut Laue Langevin,38042 Grenoble, France

The pyrochlore compound Pr2 Zr2 O7 is suggested to be a good candidate for displaying quantum spin ice phenomenology [1]. This is supported by re- cent measurements by Kimura et al showing that the elastic magnetic pattern displays a large pinch point broadening and fast fluctuations down to 50 mK. They also showed that the first excited level of the crystal electric field of the non-Kramers ion Pr3+ is located at 9.5 meV above the doublet ground state [2].

In this work, we report local susceptibility measurements carried out with polarised neutrons revealing the strong Ising-like anisotropy of the magnetic moments of the Pr3+ ions along the <111> axis. We also investigate the field induced magnetic ordering of this compound using neutron diffraction, time-of- flight and triple-axes inelastic scattering. Our experiments support the existence of ferromagnetic correlations between the magnetic moments and a mixing of the two wave functions of the non-Kramers doublet ground state.

We will discuss these results in a more general context including the Ising- like non-Kramers Tb3+ ions in Tb2 Ti2 O7 . In that case, the coupling with the lattice written in terms of quadrupoles is probably responsible for this mixing [3,4].

[1] M.J.P. Gingras and P.A. McClarty, arXiv1311:1817v1 (2013). [2] K. Kimura et al, Nat. Commun., 5, 1934 (2013). [3] T. Fennell et al, Phys. Rev. Lett., 112, 017203, (2013). [4] S. Guitteny et al, Phys. Rev. Lett., 111, 087201, (2013).

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