title: Fluctuations and All-In-All-Out Ordering in Dipole-Octupole Nd(2)Zr(2)O(7).
abstract: By means of neutron scattering and magnetization measurements down to 90 mK, we determine the magnetic ground state of the spin-ice candidate Nd(2)Zr(2)O(7). We show that, despite ferromagnetic interactions, Nd(2)Zr(2)O(7) undergoes a transition around 285 mK towards an all-in-all-out antiferromagnetic state, with a strongly reduced ordered magnetic moment. We establish the (H,T) phase diagram in the three directions of the applied field and reveal a metamagnetic transition around 0.1 T, associated with an unexpected shape of the magnetization curves. We propose that this behavior results from the peculiar nature of the Nd^{3+} doublet, a dipolar-octupolar doublet, different from the standard Kramers doublet studied to date, thus revealing the importance of multipolar correlations in the properties of pyrochlore oxides.
authors.affiliation: CNRS, Institut NEEL, F-38000 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Lhotel
authors.affiliation: Laboratoire Léon Brillouin, CEA-CNRS UMR 12, CE-Saclay, F-91191 Gif-sur-Yvette, France.
authors.forename: S
authors.initials: S
authors.lastname: Petit
authors.affiliation: Laboratoire Léon Brillouin, CEA-CNRS UMR 12, CE-Saclay, F-91191 Gif-sur-Yvette, France.
authors.forename: S
authors.initials: S
authors.lastname: Guitteny
authors.affiliation: CNRS, Institut NEEL, F-38000 Grenoble, France.
authors.forename: O
authors.initials: O
authors.lastname: Florea
authors.affiliation: Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Ciomaga Hatnean
authors.affiliation: CNRS, Institut NEEL, F-38000 Grenoble, France.|Univ. Grenoble Alpes, Institut NEEL, F-38000 Grenoble, France.
authors.forename: C
authors.initials: C
authors.lastname: Colin
authors.affiliation: INAC SPSMS, CEA and Université Joseph Fourier, F-38000 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Ressouche
authors.affiliation: Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom.
authors.forename: M R
authors.initials: MR
authors.lastname: Lees
authors.affiliation: Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom.
authors.forename: G
authors.initials: G
authors.lastname: Balakrishnan