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11 papers · 2 filters
Emergence of heavy quasiparticles from a massless Fermi sea: Optical conductivity
Hyunyong Lee, Stefan Kettemann
We study the density of states and the optical conductivity of a Kondo lattice which is immersed in a massless Dirac Fermi sea, as characterized by a linear dispersion relation. As…
Arbitrary Chern number generation in the three-band model from momentum space
Soo-Yong Lee, Jin-Hong Park, Gyungchoon Go +1
A simple, general rule for generating a three-band model with arbitrary Chern numbers is given. The rule is based on the idea of monopole charge-changing unitary operations and can…
Magnon breakdown in a two dimensional triangular lattice Heisenberg antiferromagnet of multiferroic LuMnO
Joosung Oh, Manh Duc Le, Jaehong Jeong +7
The breakdown of magnons, the quasiparticles of magnetic systems, has rarely been seen. By using an inelastic neutron scattering technique we report the observation of spontaneous…
Large in-plane deformation of RuO6 octahedron and ferromagnetism of bulk SrRuO3
Sanghyun Lee, J. R. Zhang, S. Torii +6
SrRuO3 is a ferromagnetic metal with several unusual physical properties such as zero thermal expansion below Tc, so-called Invar behavior. Another anomalous feature is that the a-…
Exploration of the helimagnetic and skyrmion lattice phase diagram in Cu2OSeO3 using magnetoelectric susceptibility
A. A. Omrani, J. S. White, K. Prša +6
Using SQUID magnetometry techniques, we have studied the change in magnetization versus applied ac electric field, i.e. the magnetoelectric (ME) susceptibility dM/dE, in the chiral…
Multiple quantum phase transitions in a heavy fermion antiferromagnet
L. Jiao, H. Q. Yuan, Y. Kohama +12
We report measurements of magnetic quantum oscillations and specific heat at low temperatures across a field-induced antiferromagnetic quantum critical point (QCP)(B_{c0}\approx50T…