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TT: Fachverband Tiefe Temperaturen

TT 53: Frustrated Magnets - Strong Spin-Orbit Coupling (joint session TT/MA)

TT 53.10: Vortrag

Donnerstag, 4. April 2019, 12:00–12:15, Theater

Discovery of kagome spin ice with crystallized magnetic monopoles in intermetallic compound HoAgGe — •Kan Zhao and Philipp Gegenwart — Experimentalphysik VI, Center for Electronic Correlations and Magnetism, Augsburg University, 86159 Augsburg, Germany

Spin ices are exotic phases of matter characterized by frustrated spins obeying local ice rules that minimize the number of spatially isolated magnetic monopoles, in analogy with the electric dipoles in water ice. In two dimension (2D), one can similarly define ice rules for in-plane Ising-like spins arranged on a kagome lattice, which require each triangle plaquette to have a single monopole, and can lead to a variety of unique orders and excitations at different temperatures.

By integral experimental and theoretical approaches including single crystal synthesis, magnetometry, thermodynamic measurements, neutron scattering and Monte Carlo simulations, we establish the intermetallic compound HoAgGe as the first example of crystalline (i.e. non-artificial) kagome spin ice[1]. It features a variety of partial and fully ordered states and sequence of field-induced phases at low temperatures, all consistent with the kagome ice rule. The multi-stage ordering behavior characteristic of kagome ice are further confirmed by specific heat and magnetic entropy data. Our discovery provides unique possibilities for the study of two-dimensional spin-ice physics.
Zhao, K. et al. submitted (2018)