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11 papers · 1 filter
Theory of Colossal Magnetoresistance in Doped Manganites
A. S. Alexandrov, A. M. Bratkovsky
The exchange interaction of polaronic carriers with localized spins leads to a ferromagnetic/paramagnetic transition in doped charge-transfer insulators with strong electron-phonon…
D-wave Bose-Einstein condensation and the London penetration depth in superconducting cuprates
A. S. Alexandrov, R. T. Giles
We show that bipolaron formation leads to a d-wave Bose-Einstein condensate in cuprates. It is the bipolaron energy dispersion rather than a particular pairing interaction which is…
The extensions of gravitational soliton solutions with real poles
J. B. Griffiths, S. Micciche
We analyse vacuum gravitational "soliton" solutions with real poles in the cosmological context. It is well known that these solutions contain singularities on certain null hypersu…
Interpreting a conformally flat pure radiation space-time
J. B. Griffiths, J. Podolsky
A physical interpretation is presented of the general class of conformally flat pure radiation metrics that has recently been identified by Edgar and Ludwig. It is shown that, at l…
Boosted static multipole particles as sources of impulsive gravitational waves
J. Podolsky, J. B. Griffiths
It is shown that the known solutions for nonexpanding impulsive gravitational waves generated by null particles of arbitrary multipole structure can be obtained by boosting the Wey…
Mobile small polaron
A. S. Alexandrov, P. E. Kornilovitch
Extending the Froehlich polaron problem to a discrete ionic lattice we study a polaronic state with a small radius of the wave function but a large size of the lattice distortion.…