308 citations · 2.5k across the 63 of their papers we have counts for
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Sequential Electronic and Structural Transitions in VO2 Observed Using X-ray Absorption Spectromicroscopy
Suhas Kumar, John Paul Strachan, Matthew D. Pickett +3
The popular dual electronic (Mott) and structural (Peierls) transitions in VO2 are explored using x-ray absorption spectromicroscopy with high spatial and spectral resolutions. It…
Phase coexistence and resistivity near the ferromagnetic transition of manganites
A. S. Alexandrov, A. M. Bratkovsky, V. V. Kabanov
Pairing of oxygen holes into heavy bipolarons in the paramagnetic phase and their magnetic pair-breaking in the ferromagnetic phase [the so-called current-carrier density collapse…
Three-body scattering problem and two-electron tunneling in molecular wires
A. S. Alexandrov, A. M. Bratkovsky, P. E. Kornilovitch
We solve the Lippmann-Schwinger equation describing elastic scattering of preformed pairs (e.g. bipolarons) off a short-range scattering center and find the two-particle transmissi…
Angular dependence of novel magnetic quantum oscillations in a quasi-two-dimensional multiband Fermi liquid with impurities
A. M. Bratkovsky, A. S. Alexandrov
The semiclassical Lifshitz-Kosevich-type description is given for the angular dependence of quantum oscillations with combination frequencies in a multiband quasi-two-dimensional F…
Charge dynamics and metal-insulator transition in SiGd and SiY alloys
D. N. Basov, A. M. Bratkovsky, P. F. Henning +5
Carrier dynamics in amorphous a-SiRE (RE=Gd, Y) films has been studied in the doping regime close to the metal-insulator transition by means of infrared spectroscopy.…
Colossal magnetooptical conductivity in doped manganites
A. S. Alexandrov, A. M. Bratkovsky
We show that the current carrier density collapse in doped manganites, which results from bipolaron formation in the paramagnetic phase, leads to a colossal change of the optical c…
Theory of optical conductivity in doped manganites
A. S. Alexandrov, A. M. Bratkovsky
The frequency and temperature dependence of the optical conductivity of ferromagnetic manganites is explained within the framework of the bipolaron theory. As these materials are c…
Carrier Density Collapse and Colossal Magnetoresistance in Doped Manganites
A. S. Alexandrov, A. M. Bratkovsky
A novel ferromagnetic transition, accompanied by carrier density collapse, is found in doped charge-transfer insulators with strong electron-phonon coupling. The transition is driv…