Session A35: Focus Session: Iron Pnictides and Other Novel Superconductors I: Synthesis and New Materials
8:00 AM–11:00 AM, Monday, March 16, 2009
Room: 405
Sponsoring Unit:
DMP
Chair: David Larbelestier, Florida State University
Abstract ID: BAPS.2009.MAR.A35.10
Abstract: A35.00010 : Superconducting Fe-Based Compounds (A$_{1-x}$Sr$_{x })$Fe$_{2}$As$_{2}$ with A = K and Cs with Transition Temperatures up to 37 K
9:48 AM–10:00 AM
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Abstract 
Authors:
Kalyan Sasmal
(TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA)
Bing Lv
(TCSUH and Department of Chemistry, University of Houston, Houston, Texas 77204, USA)
Bernd Lorenz
(TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA)
Arnold M. Guloy
(TCSUH and Department of Chemistry, University of Houston, Houston, Texas 77204, USA)
Feng Chen
(TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA)
Yu-Yi Xue
(TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA)
Ching-Wu Chu
(TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA; )
New high-Tc Fe-based superconducting compounds, AFe$_{2}$As$_{2}$ with A = K, Cs, K/Sr, and Cs/Sr, were synthesized. The Tc of KFe$_{2}$As$_{2}$ and CsFe$_{2}$As$_{2}$ is 3.8 and 2.6 K, respectively, which rises with partial substitution of Sr for K and Cs and peaks at 37 K for 50{\%}--60{\%} Sr substitution, and the compounds enter a spin-density-wave state with increasing electron number (Sr content). The compounds represent p-type analogs of the n-doped rare-earth oxypnictide superconductors. Their electronic and structural behavior demonstrate the crucial role of the (Fe$_{2}$As$_{2})$ layers in the superconductivity of the Fe-based layered systems, and the special feature of having elemental A layers provides new avenues to superconductivity at higher Tc.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.A35.10