Probing magnetic order and disorder in the one-dimensional molecular spin chains CuF2(pyz) and [Ln(hfac)3(boaDTDA)]n (Ln=Sm, La) using implanted muons
(2019)
The life, science and times of Lev Vasilevich Shubnikov
Contemporary Physics Taylor & Francis 60:2 (2019) 206-207
Phase Transitions, Broken Symmetry and the Renormalization Group
Chapter in The Routledge Handbook of Emergence, Taylor & Francis (2019) 237-247
Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet 伪-Li2IrO3
Physical Review B American Physical Society 99:5 (2019) 054426
Abstract:
The layered honeycomb iridate 伪-Li2IrO3 displays an incommensurate magnetic structure with counterrotating moments on nearest-neighbor sites, proposed to be stabilized by strongly frustrated anisotropic Kitaev interactions between spin-orbit entangled Ir4+ magnetic moments. Here we report powder inelastic neutron scattering measurements that observe sharply dispersive low-energy magnetic excitations centered at the magnetic ordering wave vector, attributed to Goldstone excitations of the incommensurate order, as well as an additional intense mode above a gap 2.3 meV. Zero-field muon-spin relaxation measurements show clear oscillations in the muon polarization below the N茅el temperature TN 15 K with a time-dependent profile consistent with bulk incommensurate long-range magnetism. Pulsed-field magnetization measurements observe that only about half the saturation magnetization value is reached at the maximum field of 64 T. A clear anomaly near 25 T indicates a transition to a phase with reduced susceptibility. The transition field has a Zeeman energy comparable to the zero-field gapped mode, suggesting gap suppression as a possible mechanism for the field-induced transition.Magnetically driven loss of centrosymmetry in metallic Pb2CoOsO6
(2019)