News of Science
January 24, 2010

MODERN PHYSICS;
Reports outline modern physics research from V.H. Babayan and colleagues

"The elastic and viscous properties of vortex lattice in ceramic
YBaCuO are studied by the measurements of ac response U in the cavity
of the hollow cylinder placed in the magnetic field H aligned along
the cylinder’s axis. It is observed that the U(H) dependence is
reaching saturation with increase of magnetic field," scientists
writing in the International Journal of Modern Physics B report.

"We interpret this effect by nonlocality of the vortex lattice elastic
constants. Based on the analysis of the response dependence on
excitation frequency, we conclude that vortex lattice deformation
vector decreases at higher frequencies. The amplitude-frequency
characteristics of the response indicate that vortices perform over
damped oscillations," wrote V.H. Babayan and colleagues.

The researchers concluded: "The estimated damping coefficient value
exceeds the evaluation by Bardeen-Stephen theory."

Babayan and colleagues published their study in International Journal
of Modern Physics B (DYNAMIC DEFORMATION OF VORTEX LATTICE IN THE
HOLLOW SUPERCONDUCTING YBaCuO CYLINDER. International Journal of
Modern Physics B, 2009;23(27):5261-5273).

Additional information can be obtained by contacting V.H. Babayan,
Armenian National Academy Science, Institute Radiophys & Electrical,
Solid State Laboratory, Ashtarak 2, Yerevan 0203, Armenia.

The publisher of the International Journal of Modern Physics B can be
contacted at: World Scientific Publ Co. Pte Ltd., 5 Toh Tuck Link,
Singapore 596224, Singapore.