Possible interface induced superconductivity in un-doped CaFe<sub>2</sub>As<sub>2</sub>

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APS March Meeting 2018

Volume 63, Number 1

Monday–Friday, March 5–9, 2018; Los Angeles, California

Session S11: Fe-based Superconductivity Under Extreme Conditions

11:15 AM–2:15 PM, Thursday, March 8, 2018
LACC Room: 303A

Sponsoring Unit: DMP
Chair: Rong Yu, Renmin University of China

Abstract ID: BAPS.2018.MAR.S11.9

Abstract: S11.00009 : Possible interface induced superconductivity in un-doped CaFe₂As₂

1:15 PM–1:27 PM

Abstract

Presenter:

Shuyuan Huyan
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Authors:

Shuyuan Huyan
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Liangzi Deng
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Kui Zhao
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Jingying Sun
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Zheng Wu
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Lijun Wu
(Brookhaven National Laboratory)

Melissa Gooch
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Bing Lv
(Department of Physics, University of Texas at Dallas)

Shuo Chen
(Department of Physics and Texas Center for Superconductivity, University of Houston)

Yimei Zhu
(Brookhaven National Laboratory)

Paul Chu
(Department of Physics and Texas Center for Superconductivity, University of Houston)

The superconductivity with a T_c up to 25 K was induced through a proper annealing process in un-doped CaFe₂As₂. A series of low temperature X-ray diffraction (LTXRD) studies were carried out and we found that the emergence of superconductivity is closely tied to the mixture of the PI and PII phases of CaFe₂As₂. The experimental results indicate that the origin of superconductivity arises from the interface of the mesoscopically stacked layers of PI and PII. Using negative binomial distribution, we simulated the possible phase distribution of samples under different thermal treatments. The simulation results are consistent with the LTXRD data. These simulations were further supported by low temperature scanning transmission electron microscopy (LTSTEM) measurements. The LTXRD, LTSTEM, and simulation results we shall present strongly support the proposal of interface-enhanced superconductivity in un-doped CaFe₂As₂.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.S11.9

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Bulletin of the American Physical Society

APS March Meeting 2018

Volume 63, Number 1

Monday–Friday, March 5–9, 2018; Los Angeles, California

Session S11: Fe-based Superconductivity Under Extreme Conditions

Abstract: S11.00009 : Possible interface induced superconductivity in un-doped CaFe2As2

Presenter:

Authors:

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Abstract: S11.00009 : Possible interface induced superconductivity in un-doped CaFe₂As₂