TY - JOUR
T1 - Comparison of Pr-doped Ca 122 and Ca 112 pnictides by low-field microwave absorption spectroscopy
AU - Howard, Austin R.
AU - Yuen, Jonathan D.
AU - Lv, Bing
AU - Salamon, Myron
AU - Chu, Ching Wu
AU - Zakhidov, Anvar A.
N1 - Publisher Copyright:
Copyright © Materials Research Society 2014.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84924411785&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84924411785&partnerID=8YFLogxK
U2 - 10.1557/opl.2014.869
DO - 10.1557/opl.2014.869
M3 - Conference article
AN - SCOPUS:84924411785
SN - 0272-9172
VL - 1684
JO - Materials Research Society Symposium Proceedings
JF - Materials Research Society Symposium Proceedings
T2 - 2014 MRS Spring Meeting
Y2 - 21 April 2014 through 25 April 2014
ER -