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Comparison of Pr-doped Ca 122 and Ca 112 Pnictides by Low-field Microwave Absorption Spectroscopy

Published online by Cambridge University Press:  11 September 2014

Austin R. Howard ,
Jonathan D. Yuen ,
Bing Lv ,
Myron Salamon ,
Ching-Wu Chu  and
Anvar A. Zakhidov
Austin R. Howard
Affiliation:
The University of Texas at Dallas, Richardson, TX 75080, U.S.A.
Jonathan D. Yuen
Affiliation:
The University of Texas at Dallas, Richardson, TX 75080, U.S.A.
Bing Lv
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, TX 77004
Myron Salamon
Affiliation:
The University of Texas at Dallas, Richardson, TX 75080, U.S.A. MPA-CMMS, Los Alamos National Laboratory, Los Alamos, NM 87545
Ching-Wu Chu
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, TX 77004
Anvar A. Zakhidov
Affiliation:
The University of Texas at Dallas, Richardson, TX 75080, U.S.A.
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Abstract

Praseodymium doped CaFe2As2 (122 structure) and CaFeAs2 (112 structure) are characterized by modulated Low Magnetic Field Microwave Absorption (LFMA) spectroscopy. In both (Pr,Ca)122 and (Pr,Ca)112 structures, a strong hysteretic LFMA is found, with a TcH of ∼30 K and ∼26 K, respectively. However, in (Pr,Ca)122, measurements also show an unusual Narrow Peak (NP) LFMA signal appearing at higher temperatures, above the lower TcH superconducting state until a TcNP of 49 K. We associate this NP LFMA with interfacial superconductivity, which has been found previously by highly anisotropic magnetization measurements. Furthermore, the absence of NP in (Pr,Ca)112 correlates with the absence of an interfacial phase. These results give useful information about the microwave signature of interfacial superconductivity present in the (Pr,Ca)122 system, and may form a roadmap towards a stabilized high temperature superconducting phase in pnictides.

Keywords

superconductingPrCa
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1684: Symposium T – Superconductor Materials—From Basic Science to Novel Technology , 2014 , mrss14-1684-t13-05
Copyright
Copyright © Materials Research Society 2014 

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