High pressure low temperature studies on 1-2-2 iron-based superconductors using designer diamond cells

Uhoya, Walter O.; Tsoi, Georgiy M.; Vohra, Yogesh K.; Mitchell, Jonathan, E.; Safa-Sefat, Athena; Weir, Samuel

doi:10.1557/opl.2013.945

Title: High pressure low temperature studies on 1-2-2 iron-based superconductors using designer diamond cells

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Abstract

In this study, high pressure low temperature electrical resistance measurements were carried out on a series of 122 iron-based superconductors using a designer diamond anvil cell. These studies were complemented by image plate x-ray diffraction measurements under high pressures and low temperatures at beamline 16-BM-D, HPCAT, Advanced Photon Source. A common feature of the 1-2-2 iron-based materials is the observation of anomalous compressibility effects under pressure and a Tetragonal (T) to Collapsed Tetragonal (CT) phase transition under high pressures. Specific studies on antiferromagnetic spin-density-wave Ba_0.5Sr_0.5Fe₂As₂ and Ba(Fe_0.9Ru_0.1)₂As₂ samples are presented to 10 K and 41 GPa. The collapsed tetragonal phase was observed at a pressure of 14 GPa in Ba_0.5Sr_0.5Fe₂As₂ at ambient temperature. The highest superconducting transition temperature in Ba_0.5Sr_0.5Fe₂As₂ was observed to be at 32 K at a pressure of 4.7 GPa. The superconductivity was observed to be suppressed on transformation to the CT phase in 122 materials.

Authors:

Uhoya, Walter O. ^[1]; Tsoi, Georgiy M. ^[1]; Vohra, Yogesh K. ^[1]; Mitchell, Jonathan, E. ^[2]; Safa-Sefat, Athena ^[2]; Weir, Samuel ^[3]

Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Tue Jan 01 00:00:00 EST 2013

Research Org.:: Univ. of Alabama, Birmingham, AL (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1251160

Grant/Contract Number:: NA0002014

Resource Type:: Accepted Manuscript

Journal Name:: MRS Proceedings

Additional Journal Information:: Journal Volume: 1582; Journal Issue: 2; Journal ID: ISSN 1946-4274

Publisher:: Materials Research Society (MRS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; superconducting; phase transformation; x-ray diffraction (XRD)

Citation Formats


                    Uhoya, Walter O., Tsoi, Georgiy M., Vohra, Yogesh K., Mitchell, Jonathan, E., Safa-Sefat, Athena, and Weir, Samuel. High pressure low temperature studies on 1-2-2 iron-based superconductors using designer diamond cells.  United States: N. p., 2013. 
Web.  doi:10.1557/opl.2013.945.

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                    Uhoya, Walter O., Tsoi, Georgiy M., Vohra, Yogesh K., Mitchell, Jonathan, E., Safa-Sefat, Athena, & Weir, Samuel. High pressure low temperature studies on 1-2-2 iron-based superconductors using designer diamond cells.  United States.  https://doi.org/10.1557/opl.2013.945

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                    Uhoya, Walter O., Tsoi, Georgiy M., Vohra, Yogesh K., Mitchell, Jonathan, E., Safa-Sefat, Athena, and Weir, Samuel. Tue .  
"High pressure low temperature studies on 1-2-2 iron-based superconductors using designer diamond cells".  United States.  https://doi.org/10.1557/opl.2013.945.  https://www.osti.gov/servlets/purl/1251160.

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@article{osti_1251160,

  title        = {High pressure low temperature studies on 1-2-2 iron-based superconductors using designer diamond cells},

  author       = {Uhoya, Walter O. and Tsoi, Georgiy M. and Vohra, Yogesh K. and Mitchell, Jonathan, E. and Safa-Sefat, Athena and Weir, Samuel},

  abstractNote = {In this study, high pressure low temperature electrical resistance measurements were carried out on a series of 122 iron-based superconductors using a designer diamond anvil cell. These studies were complemented by image plate x-ray diffraction measurements under high pressures and low temperatures at beamline 16-BM-D, HPCAT, Advanced Photon Source. A common feature of the 1-2-2 iron-based materials is the observation of anomalous compressibility effects under pressure and a Tetragonal (T) to Collapsed Tetragonal (CT) phase transition under high pressures. Specific studies on antiferromagnetic spin-density-wave Ba0.5Sr0.5Fe2As2 and Ba(Fe0.9Ru0.1)2As2 samples are presented to 10 K and 41 GPa. The collapsed tetragonal phase was observed at a pressure of 14 GPa in Ba0.5Sr0.5Fe2As2 at ambient temperature. The highest superconducting transition temperature in Ba0.5Sr0.5Fe2As2 was observed to be at 32 K at a pressure of 4.7 GPa. The superconductivity was observed to be suppressed on transformation to the CT phase in 122 materials.},

  doi          = {10.1557/opl.2013.945},

  journal      = {MRS Proceedings},

  number       = 2,

  volume       = 1582,

  place        = {United States},

  year         = {Tue Jan 01 00:00:00 EST 2013},

  month        = {Tue Jan 01 00:00:00 EST 2013}

}

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