Record Details

SCANNING TUNNELING MICROSCOPIC STUDIES OF GROWTH SPIRALS IN BULK SINGLE-CRYSTALS OF SUPERCONDUCTING YBA2CU3O7 AND FLUX PINNING

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title SCANNING TUNNELING MICROSCOPIC STUDIES OF GROWTH SPIRALS IN BULK SINGLE-CRYSTALS OF SUPERCONDUCTING YBA2CU3O7 AND FLUX PINNING
 
Creator NARLIKAR, AV
DUTTA, PK
SAMANTA, SB
SRIVASTAVA, ON
RAMASAMY, P
SABARWAL, SC
GUPTA, MK
PADALIA, BD
 
Description Growth spirals have been observed in the basal plane of bulk single crystals of Y-123 high T(c) cuprate, using scanning tunneling microscope with the unit cell resolution. The density of screw dislocations present is of the order of 10(7)-10(8)/cm2, close to the recently reported values for the sputtered epitaxial thin films of Y-123. The growth steps or terraces which are generally shown to possess a step height equal to the c parameter of the unit cell, have been further resolved into substeps corresponding to each of the triple perovskite block. Further, in the limit of ultimate resolution we have been able to demonstrate the substep heights corresponding to the individual atomic layers of the unit cell and thus provide a persuasive evidence that single crystals of Y-123 grow via layer-by-layer growth on the atomic scale within the purview of the spiral growth mechanism. Growth features are briefly discussed and it is argued that the observed screw dislocation density is still too low and the orientation is not favorable for realizing optimum flux pinning in these HTSC systems.
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T13:59:31Z
2011-12-26T12:49:47Z
2011-12-27T05:35:30Z
2011-07-16T13:59:31Z
2011-12-26T12:49:47Z
2011-12-27T05:35:30Z
1992
 
Type Article
 
Identifier APPLIED PHYSICS LETTERS, 60(15), 1896-1898
0003-6951
http://dx.doi.org/10.1063/1.107146
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4443
http://hdl.handle.net/10054/4443
 
Language en