Comparison of Pr-doped Ca 122 and Ca 112 pnictides by low-field microwave absorption spectroscopy

Austin R. Howard, Jonathan D. Yuen, Bing Lv, Myron Salamon, Ching Wu Chu, Anvar A. Zakhidov

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
JournalMaterials Research Society Symposium Proceedings
Publication statusPublished - 2014
Event2014 MRS Spring Meeting - San Francisco, United States
Duration: 2014 Apr 212014 Apr 25

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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