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Heavy-Fermions in a Transition-Metal Compound:
The recent discovery of heavy-Fermion properties in Lithium Vanadate and the
enormous difference in its properties from the properties of Lithium Titanate
as well as of the manganite compounds raise some puzzling questions about
strongly correlated Fermions. These are disscussed as well as a solution to the
puzzles provided.Comment: late
Chiral spin-order in some purported Kitaev spin-liquid compounds
We examine recent magnetic torque measurements in two compounds,
-LiIrO and RuCl, which have been discussed as possible
realizations of the Kitaev model. The analysis of the reported discontinuity in
torque, as an external magnetic field is rotated across the axis in both
crystals, suggests that they have a translationally-invariant chiral spin-order
of the from in the ground
state and persisting over a very wide range of magnetic field and temperature.
An extra-ordinary dependence of the torque for small fields, beside
the usual part, is predicted due to the chiral spin-order, and found to
be consistent with experiments upon further analysis of the data. Other
experiments such as inelastic scattering and thermal Hall effect and several
questions raised by the discovery of chiral spin-order, including its
topological consequences are discussed.Comment: Clearer figures of the experimental data provided. Also clearer
exposition and comment on related recent wor
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