Strange Magnetism Exposed by Neutron Scattering

Collin Broholm (Johns Hopkins)

A radically different form of magnetism defined by quantum entanglement is explored using neutron scattering. Starting from illustrative one-dimensional examples, I discuss recent experiments that probe magnetic excitations in two and three-dimensional frustrated quantum magnets. In analogy with atomic positions in superfluid ⁴He, atomic scale magnetic dipoles in these materials exist in a state of quantum superposition near the absolute zero temperature. While there is no static magnetic order to distinguish such materials they host exotic emergent quasi-particles that scatter neutrons. The potential relevance of the quantum spin liquid to high temperature superconductivity shall be illustrated through our recent quantitative and spatially resolved measurements of the superconducting condensation energy in Fe_1+ySe_xTe_1-x [3].

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Cette conférence est présentée par le RQMP Versant Nord du Département de physique de l'Université de Montréal et le Département de génie physique de Polytechnique Montréal.

Cette conférence s'adresse à tous, y compris les professeurs, les chercheurs et les étudinats des trois cycles. Le café est servi à partir de 11h30.