Speaker
Ellen Fogh
(École Polytechnique Fédérale de Lausanne)
Description
Chasing new states of quantum matter is a central element in condensed matter physics, motivated both by curiosity but also by the need for understanding of many-body quantum effects. One particularly interesting system is the frustrated Shastry-Sutherland model consisting of orthogonal spin pairs. The network of Cu$^{2+}$ ions in SrCu$_2$(BO$_3$)$_2$ is topologically equivalent to this lattice and therefore presents a unique experimental testing opportunity. We study the magnetic excitations in SrCu$_2$(BO$_3$)$_2$ upon approaching the first magnetization plateau at 27 T using inelastic neutron scattering. At field values much below the transition an unexpected mode shows up. We set out to identify the nature of this new excitation.
Author
Ellen Fogh
(École Polytechnique Fédérale de Lausanne)
Co-authors
Bruce Normand
(Paul Scherrer Institute)
Ekaterina Pomjakushina
(Paul Scherrer Institute)
Frédéric Mila
(École Polytechnique Fédérale de Lausanne)
Prof.
Henrik Ronnow
Maciej Bartkowiak
(Helmholtz-Zentrum Berlin für Materialien und Energie)
Mithilesh Nayak
(École Polytechnique Fédérale de Lausanne)
Oleksandr Prokhnenko
(Helmholtz-Zentrum Berlin für Materialien und Energie)
