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Spontaneous Disorder Near the Mott Transition on Frustrated Lattices
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- 1 Correlation and Disorder in Classical and Quantum Systems
- 2 Spontaneous disorder near the Mott transition on frustrated lattices
- 3 Outline
- 4 Lattice geometry in the Mott transition..
- 5 Frustration?
- 6 There are several lattices with triangular motifs in 2D and 3D:
- 7 Real material? A snapshot..
- 8 The triangular and FCC support LRO, we focus on the pyrochlore..
- 9 The pyrochlore Mott transition..
- 10 How does the Mott transition occur on the pyrochlore Hubbard model?
- 11 Effective model at half filling:
- 12 What controls the magnetic state?
- 13 The correlated moments couple to the electrons via:
- 14 Results: average moment, residual resistivity and phase diagram
- 15 Finite temperature: DOS, resistivity..
- 16 Experiments, and a more complex model..
- 17 Moybdates R2Mo2O7 provide a realisation of pyrochlore Mott physics
- 18 Field driven insulator-metal transition in Gd2Mo2O7
- 19 What are the key issues?
- 20 R2Mo2O7: degrees of freedom Solovyev, 2003
- 21 Microscopic model
- 22 Simplify
- 23 We use the following strategy
- 24 "Spontaneous disorder" and its effects..
- 25 The qualitative physics:
- 26 How do these effects play out? phase diagrams..
- 27 Comparing with experiments i phase diagram, magnetisation..
- 28 Comparison ii resistivity, optical weight..
- 29 Focus on the T=0 state..
- 30 Tuning the degree of localisation: the JAF knob..
- 31 Thanks
- 32 Q&A
