Document Detail


Doping dependence of the pressure response of Tc in the SmO(1-x)F(x)FeAs superconductors.
MedLine Citation:
PMID:  18582060     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The superconducting transition temperature of the high-Tc SmO1-xFxFeAs superconductors increases monotonically as the F-doping level x increases to 0.20. High-pressure magnetization experiments reveal a strong sensitivity of Tc to interatomic distances in the underdoped regime (x </= 0.12) with the pressure coefficient of Tc, d(ln Tc)/dP being strongly positive. However, as the doping level increases further to x = 0.15, we find that this sensitivity is strongly suppressed and at the same time, d(ln Tc)/dP sharply switches over to assume negative values with Tc decreasing with increasing applied pressure. The abrupt change in the pressure response of the superconducting properties of the SmO1-xFxFeAs phases coincides with the putative existence of a quantum critical point (QCP) near x approximately 0.14, as proposed by resistivity and Hall effect measurements.
Authors:
Yasuhiro Takabayashi; Martin T McDonald; Dionisis Papanikolaou; Serena Margadonna; G Wu; R H Liu; X H Chen; Kosmas Prassides
Publication Detail:
Type:  Journal Article     Date:  2008-06-27
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  130     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-07-17     Completed Date:  2008-09-02     Revised Date:  2008-12-23    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9242-3     Citation Subset:  -    
Affiliation:
Department of Chemistry, University of Durham, Durham DH1 3LE, UK.
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