Supercooling and fragile glassiness in a dipolar kagome Ising magnet

Ferromagnetism, glassiness, and metastability in a dilute dipolar-coupled magnet.

%e have measured the ac magnetic susceptibility of the model dilute dipolar-coupled Ising system LiHo„Y& -„F4. The x 0.46 material displays an ordinary ferromagnetic transition, while the x 0.045 and 0.167 samples are two very different magnetic glasses. Thermal relaxation times are more than five times longer for x 0.167 than for x ~0.045. In addition, the more concentrated glass shows history...

Emergent order in the kagome Ising magnet Dy3Mg2Sb3O14

The Ising model-in which degrees of freedom (spins) are binary valued (up/down)-is a cornerstone of statistical physics that shows rich behaviour when spins occupy a highly frustrated lattice such as kagome. Here we show that the layered Ising magnet Dy3Mg2Sb3O14 hosts an emergent order predicted theoretically for individual kagome layers of in-plane Ising spins. Neutron-scattering and bulk the...

Properties of the branched state of an Ising dipolar magnet

Topological excitations in a kagome magnet.

Chirality--that is, left or right handedness--is present in many scientific areas, and particularly in condensed matter physics. Inversion symmetry breaking relates chirality with skyrmions, which are protected field configurations with particle-like and topological properties. Here we show that a kagome magnet, with Heisenberg and Dzyaloshinskii-Moriya interactions, causes non-trivial topologi...

Glassy relaxation without freezing in a random dipolar-coupled Ising magnet.

We have measured the magnetic susceptibility, X'+iX", of the dilute dipolar-coupled Ising magnet LiHopp45Yp955F4 over six decades of frequency from 0.02 Hz to 20 kHz. The system behaves as an ideal relaxational glass with Arrhenius behavior in temperature of the peak in X". Scaling data from T=100 mK to T =300 mK by the peak in X" shows an enhanced low-frequency response at high temperatures, i...