Alexander Kolesnikov

Dr. Alexander I. Kolesnikov

Instrument Scientist: Fine-Resolution Fermi Chopper Spectrometer (SEQUOIA), SNS

Education

1983 – Ph.D. in Physics & Mathematics at Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Moscow District, Russia

1977 – Graduated in Physics from the Department of Experimental and Theoretical Physics of Moscow Institute of Engineering and Physics, Moscow, Russia

Description of Research

Alexander’s research interests include study of vibrational dynamics and structure of metal hydrides, hydrogen storage materials, carbon nano-materials, water/ice, liquids and gases under nanoscale confinement, etc. by using neutron scattering at various time and length scales. In recent years, he obtained the following results:

  1. Using wide range of neutron scattering techniques (ND, SANS, INS, QENS, DINS) and MD simulations, anomalously soft dynamics of water in single-wall carbon nanotubes have been observed and explained (nanotube-water at T=5K is more mobile compared to bulk ice at melting point). Currently, this experimental and theoretical research extends to water confined in SWNT of different diameters, at different pressures and temperatures.
  2. Dynamics of molecular hydrogen and covalently bound hydrogen in carbon nanotubes and C60-fullerenes hydrogenated under high pressure (50 kbar).
  3. Dynamics of different crystalline phases and amorphous states of ice.
  4. Dynamics of metal hydrides obtained under high hydrogen pressure: CrH, MnH, FeH, CoH, NiH, Ru-H, RhH, PdH, Re-H. The results showed that, as the atomic number of the host metal decreased, there was a significant increase in the hydrogen-metal interaction in hydrids of group VI-VIII transition metals, which outweighs the influence of the accompanying nearest hydrogen–metal distance increase in the hydrides.
  5. INS study of prospective hydrogen storage materials: Li amide and imide, Li-Be-H system, AlH3.
  6. Observation by neutron spectroscopy of two different O-H covalent bonds in water molecule in the Na0.3CoO2·1.3H2O superconductor.
  7. Discovery of the giant tunneling effect of hydrogen in α-Mn, as well as direct observation of coherent proton tunneling in α-Mn using neutron Compton scattering (the momentum distribution reveals the oscillations analogous to the diffraction pattern in a two slit experiment).
  8. The phonon density of states in new superconductor material Mg11B2 (Tc=39.2 K) was measured by inelastic neutron scattering. A simple Born-von Kármán model was able to reproduce the mode energies and provided an estimate of the electron-phonon coupling of λ~0.9. Furthermore, it was shown that the estimated B and Mg contributions to the isotope effect were in qualitative agreement with experiment. The data confirmed that a conventional phonon mechanism, with moderately strong electron-phonon coupling, could explain the observed superconductivity.

Alexander Kolesnikov has received Alexander von Humboldt Research Fellowship for 1987-1989. Alexander has published more than 150 research articles in international journals and has presented many invited talks at international conferences and seminars.

He serves as a referee for the following scientific journals: Chem. Phys.; Comp. Model. Eng. & Sci.; Carbohydrate Res.; Inorg. Chem.; J. Am. Chem. Soc.; J. Chem. Phys.; J. Non-Cryst. Sol.; J. Phys. Chem.; J. Phys.: Cond. Matt.; Physica B; Phys. Rev. B; Phys. Rev. Lett.

Selected Publications

N. Choudhury, E.J. Walter, A.I. Kolesnikov, and C.-K. Loong, “Large phonon band gap in SrTiO3 and the vibrational signatures of ferroelectricity in ATiO3 perovskite: First-principles lattice dynamics and inelastic neutron scattering,” Phys. Rev. B 77, 134111 (2008).

A.I. Kolesnikov, H.X. Yang, Y.G. Shi, J.Q. Li, R.I. Walton, and J. Li, “Observation of two O-H covalent bonds of water in the Na0.3CoO2·1.3H2O superconductor by inelastic neutron spectroscopy,” Phys. Rev. B 76, 092302 (2007).

A.I. Kolesnikov, I.O. Bashkin, V.E. Antonov, D. Colognesi, J. Mayers, and A.P. Moravsky, “Neutron spectroscopy study of single-walled carbon nanotubes hydrogenated under high pressure,” J. Alloys Comp. 446-447, 389 (2007).

X.-Q. Chu, A.I. Kolesnikov, A.P. Moravsky, V. Garcia-Sakai, and S.-H. Chen, “Observation of a dynamic crossover in water confined in double-wall carbon nanotubes,” Phys. Rev. E 76, 021505 (2007).

A.I. Kolesnikov, V.E. Antonov, Yu.E. Markushkin, I. Natkaniec, and M.K. Sakharov, “Lattice dynamics of AlH3 and AlD3 examined by inelastic neutron scattering,” Phys. Rev B 76, 064302 (2007).

G. Reiter, C. Burnham, D. Homouz, P.M. Platzman, J. Mayers, T. Abdul-Redah, A.P. Moravsky, J.C. Li, C.-K. Loong, and A.I. Kolesnikov, “Anomalous zero point motion of the protons in water in carbon nanotubes,” Phys. Rev. Lett. 97, 247801 (2006).

A.I. Kolesnikov, C.-K. Loong, N.R. de Souza, C.J. Burnham, and A.P. Moravsky, “Anomalously soft dynamics of water in carbon nanotubes,” Physica B 385-386, 272 (2006).

A.I. Kolesnikov, J.C. Li, and D. Colognesi, “Low-energy neutron vibrational spectra of high pressure phases of ice,” J. Neutr. Res. 14, 325 (2006).

C.-K. Loong, P. Thiyagarajan, and A.I. Kolesnikov, “Neutron-scattering characterization of nanostructured materials relevant to biotechnology,” Nanotechnology 15, S664 (2004).

A.I. Kolesnikov, J.-M. Zanotti, C.-K. Loong, P. Thiyagarajan, A.P. Moravsky, R.O. Loutfy, and C.J. Burnham “Anomalously soft dynamics of water in a nanotube: a revelation of nanoscale confinement,” Phys. Rev. Lett. 93, 035503 (2004).

R. Osborn, E.A. Goremychkin, A.I. Kolesnikov, and D.G. Hinks, “Phonon density-of-states in MgB2,” Phys. Rev. Lett. 87, 017005 (2001).