S. R. Dunsiger

Revisiting static and dynamic spin-ice correlations in Ho₂Ti₂O₇ with neutron scattering

J.P. Clancy, J.P.C. Ruff, S.R. Dunsiger, Y. Zhao, H.A. Dabkowska, J.S. Gardner, 3 Y. Qiu, 4 J.R.D. Copley, T. Jenkins, and B.D. Gaulin 5 Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1 NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899-8102, USA Indiana University, 2401 Milo B. Sampson Lane, Bloomington, Indiana 47408, USA Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA Canadian Institute for Advanced Research, 180 Dundas Street W., Toronto, Ontario, Canada M5G 1Z8

Field-Induced Order and Spin Waves in the Pyrochlore Antiferromagnet Tb~2Ti~2O~7

High resolution time-of-flight neutron scattering measurements on Tb(2)Ti(2)0(7) reveal a rich low temperature phase diagram in the presence of a magnetic field applied along [110]. In zero field at T = 0.4 K, Tb(2)Ti(2)0(7) is a highly correlated cooperative paramagnet with disordered spins residing on a pyrochlore lattice of corner-sharing tetrahedra. Application of a small field condenses much of the magnetic diffuse scattering, characteristic of the disordered spins, into a new Bragg peak characteristic of a polarized paramagnet. At higher fields, a magnetically ordered phase is induced, which supports spin wave excitations indicative of continuous, rather than Ising-like, spin degrees of freedom.

Unconventional Magnetic Ground State in Yb2Ti2O7

We report low temperature specific heat and muon spin relaxation/rotation (

Diagonal and collinear incommensurate spin structures in underdoped La 2 − x Ba x CuO 4

\mu

Incommensurate Spin Ordering and Fluctuations in underdoped La

SR) measurements on both polycrystalline and single crystal samples of the pyrochlore magnet Yb

_2-x

_2

Ba

Ti

_x

_2

CuO

O

_4

_7