title: Dynamical splayed ferromagnetic ground state in the quantum spin ice Yb(2)Sn(2)O(7).
abstract: From magnetic, specific heat, (170)Yb Mössbauer effect, neutron diffraction, and muon spin relaxation measurements on polycrystalline Yb(2)Sn(2)O(7), we show that below the first order transition at 0.15 K all of the Yb(3+) ions are long-range magnetically ordered and each has a moment of 1.1 μ(B) which lies at ≃ 10° to a common fourfold cubic axis. The four sublattice moments have four different directions away from this axis and are therefore noncoplanar. We term this arrangement splayed ferromagnetism. This ground state has a dynamical component with a fluctuation rate in the megahertz range. The net ferromagnetic exchange interaction has an anisotropy that favors the local threefold axis. We discuss our results in terms of the phase diagram proposed by Savary and Balents [Phys. Rev. Lett. 108, 037202 (2012)] for a pyrochlore lattice of Kramers 1/2 effective spins.
authors.affiliation: Institut Nanosciences et Cryogénie, SPSMS, CEA and Université Joseph Fourier, F-38054 Grenoble, France.
authors.forename: A
authors.initials: A
authors.lastname: Yaouanc
authors.affiliation: Institut Nanosciences et Cryogénie, SPSMS, CEA and Université Joseph Fourier, F-38054 Grenoble, France.
authors.forename: P
authors.initials: P
authors.lastname: Dalmas de Réotier
authors.affiliation: CEA/DSM, Institut Rayonnement Matière de Saclay, SPEC, 91191 Gif-sur-Yvette, France.
authors.forename: P
authors.initials: P
authors.lastname: Bonville
authors.affiliation: CEA/DSM, Institut Rayonnement Matière de Saclay, SPEC, 91191 Gif-sur-Yvette, France.
authors.forename: J A
authors.initials: JA
authors.lastname: Hodges
authors.affiliation: Institut Nanosciences et Cryogénie, SPSMS, CEA and Université Joseph Fourier, F-38054 Grenoble, France and P.L. Kapitza Institute for Physical Problems, RAS, 119334 Moscow, Russia.
authors.forename: V
authors.initials: V
authors.lastname: Glazkov
authors.affiliation: Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Keller
authors.affiliation: Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.
authors.forename: V
authors.initials: V
authors.lastname: Sikolenko
authors.affiliation: Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Bartkowiak
authors.affiliation: Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Amato
authors.affiliation: Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Baines
authors.affiliation: Rutherford Appleton Laboratory, ISIS Facility, Chilton OX11 0QX, United Kingdom.
authors.forename: P J C
authors.initials: PJ
authors.lastname: King
authors.affiliation: FAME, R3, Applied Sciences, Delft University of Technology, 2629JB Delft, The Netherlands.
authors.forename: P C M
authors.initials: PC
authors.lastname: Gubbens
authors.affiliation: CEA/DSM, Institut Rayonnement Matière de Saclay, SPEC, 91191 Gif-sur-Yvette, France.
authors.forename: A
authors.initials: A
authors.lastname: Forget