Upper critical field and thermally activated flux flow in LaFeAsO <inf>1-x</inf>F<inf>x</inf>

Shahbazi, M; Wang, XL; Shekhar, C; Srivastava, ON; Lin, ZW; Zhu, JG; Dou, SX

Upper critical field and thermally activated flux flow in LaFeAsO <inf>1-x</inf>F<inf>x</inf>

Shahbazi, M Wang, XL Shekhar, C Srivastava, ON Lin, ZW Zhu, JG

Dou, SX

Permalink

Publication Type:: Journal Article
Citation:: Journal of Applied Physics, 2011, 109 (7)
Issue Date:: 2011-04-01

Closed Access

	Filename	Description	Size
	2010004705OK.pdf		1.28 MB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Shahbazi, M	en_US
dc.contributor.author	Wang, XL	en_US
dc.contributor.author	Shekhar, C	en_US
dc.contributor.author	Srivastava, ON	en_US
dc.contributor.author	Lin, ZW	en_US
dc.contributor.author	Zhu, JG https://orcid.org/0000-0002-9763-4047	en_US
dc.contributor.author	Dou, SX	en_US
dc.date.issued	2011-04-01	en_US
dc.identifier.citation	Journal of Applied Physics, 2011, 109 (7)	en_US
dc.identifier.issn	0021-8979	en_US
dc.identifier.uri	http://hdl.handle.net/10453/14559
dc.description.abstract	The magneto-resistance, critical current density, Jc, upper critical field, Hc2, and flux pinning properties of LaFeAsO 1-xFx superconductors were investigated systematically by magnetic and magneto-transport measurements in the fields up to 13 T over a temperature range of 5-35 K. It was found that the Hc2 increased with increasing fluorine concentration up to x 0.15, while with higher fluorine doping, Hc2 decreased. A peak effect in the J c as a function of field was observed at T 15 K for both the 5 and 15 fluorine doped samples. The broadening of the superconducting transition in magnetic field can be well understood by the thermally activated flux flow model. The pinning potential, Uo, scales as Uo/k B B-n with n 0.13 for B 1 T and n - 0.68 for B 1 T for LaFeAsO0.85F0.15. © 2011 American Institute of Physics.	en_US
dc.relation.ispartof	Journal of Applied Physics	en_US
dc.relation.isbasedon	10.1063/1.3566069	en_US
dc.subject.classification	Applied Physics	en_US
dc.title	Upper critical field and thermally activated flux flow in LaFeAsO <inf>1-x</inf>F<inf>x</inf>	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	109	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	01 Mathematical Sciences	en_US
utslib.for	02 Physical Sciences	en_US
utslib.for	09 Engineering	en_US
dc.location.activity	WOS:000289952100348	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
pubs.organisational-group	/University of Technology Sydney/Strength - GEVI - Green Energy and Vehicle Innovations
utslib.copyright.status	closed_access
pubs.issue	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	109	en_US

Abstract:

The magneto-resistance, critical current density, Jc, upper critical field, Hc2, and flux pinning properties of LaFeAsO 1-xFx superconductors were investigated systematically by magnetic and magneto-transport measurements in the fields up to 13 T over a temperature range of 5-35 K. It was found that the Hc2 increased with increasing fluorine concentration up to x 0.15, while with higher fluorine doping, Hc2 decreased. A peak effect in the J c as a function of field was observed at T 15 K for both the 5 and 15 fluorine doped samples. The broadening of the superconducting transition in magnetic field can be well understood by the thermally activated flux flow model. The pinning potential, Uo, scales as Uo/k B B-n with n 0.13 for B 1 T and n - 0.68 for B 1 T for LaFeAsO0.85F0.15. © 2011 American Institute of Physics.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/14559