Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Frustrated Magnets - Strong Spin-Orbit Coupling 2 (joint session TT/MA)

TT 43.3: Vortrag

Mittwoch, 18. März 2020, 15:30–15:45, HSZ 304

Short range spin ice type correlations of Kagome spin ice HoAgGe by diffuse neutron scattering — •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 dimensions, 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.

With P-62m structure, Ho sites of HoAgGe in the ab plane form a distorted kagome lattice. According to magnetometry, thermodynamic measurements, elastic neutron scattering and Monte Carlo simulations, we establish HoAgGe as the unique crystalline system to realize the kagome spin ice state [1].

The short range spin ice type correlations, have been predicted as one characteristic feature of classical kagome spin ice model. Thus, we conducted the diffuse scattering for HoAgGe above the long range magnetic order temperature. And clear diffuse scattering pattern is obtained, which is consistent with that of Monte Carlo simulations based on a classical spin model consisting of Ising-like in-plane spins on the 2D distorted kagome lattice of HoAgGe [1].

[1] Zhao, Kan et al. Submitted (2018)

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