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Condensed Matter Seminars

ics Condensed Matter
Tuesday, April 24, 2018
11:00 AM
Physics Building, Room 313
Note special date.
Jing Luo [Host: Gia-Wei Chern]
UVA-Department of Physics
"Frustrated Kondo chains and glassy magnetic phases on the pyrochlore lattice"
ABSTRACT:

We present an extensive numerical study of a new type of frustrated itinerant magnetism on the pyrochlore lattice. In this theory, the pyrochlore magnet can be viewed as a cross-linking network of Kondo or double-exchange chains. Contrary to models based on Mott insulators, this itinerant magnetism approach provides a natural explanation for several spin and orbital superstructures observed on the pyrochlore lattice. Through extensive Monte Carlo simulations, we obtain the phase diagrams at two representative electron filling fractions $n = 1/2$ and 2/3. In particular, we show that an intriguing glassy magnetic state characterized by ordering wavevectors $\mathbf q = \langle \frac{1}{3},\frac{1}{3}, 1\rangle$ gives a rather satisfactory description of the low temperature phase recently observed in spinel~GeFe$_2$O$_4$.

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