Session S1: Poster Session III (1:00pm - 4:00pm)
1:00 PM–1:00 PM, Wednesday, March 23, 2011
Room: Hall D
Sponsoring Unit:
APS
Abstract ID: BAPS.2011.MAR.S1.269
Abstract: S1.00269 : Transport properties of superconducting La and Ce-based ferropnictides
Preview Abstract
MathJax On | Off 
Abstract 
Authors:
S.J. Singh
(School of Physical Sciences, Jawaharlal Nehru University New Delhi-110067 India)
J. Prakash
(Department of Chemistry, Indian Institute of Technology New Delhi-110016 India)
A.K. Ganguli
(Department of Chemistry, Indian Institute of Technology New Delhi-110016 India)
S. Patnaik
(School of Physical Sciences, Jawaharlal Nehru University New Delhi-110067 India)
To understand the role of chemical pressure, we have synthesized a variety of La and Ce-based ferropnicides (La/Ce)OFeAs with substitution of Y, F, Co and Sb in place of La/Ce, O, Fe and As respectively. A broad spectrum of characterizations involving XRD, SEM, magnetoresistance, magnetization, penetration depth, Hall effect and thermoelectric power have been undertaken on these phase pure superconducting compounds. The transition temperature and upper critical field reached maximum of 48.6 K {\&} 146 T in Ce-based sample whereas 35 K and 122 T in La-based superconductor. The magnetization measurements of all samples showed negligible hysteresis reflecting weak link behaviour or an imperfectly connected superconducting state. The thermoelectric power and Hall measurement confirmed the dominant role played by electrons in these multiband superconductors. The rf penetration depth analysis indicated s-wave pairing symmetry with multiple gap values.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.269