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Title: High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd 2 As 2

Abstract

While the layered 122 iron arsenide superconductors are highly anisotropic, unconventional, and exhibit several forms of electronic orders that coexist or compete with superconductivity in different regions of their phase diagrams, we find in the absence of iron in the structure that the superconducting characteristics of the end member BaPd2As2 are surprisingly conventional. Here we report on complementary measurements of specific heat, magnetic susceptibility, resistivity measurements, Andreev spectroscopy, and synchrotron high pressure x-ray diffraction measurements supplemented with theoretical calculations for BaPd2As2. Its superconducting properties are completely isotropic as demonstrated by the critical fields, which do not depend on the direction of the applied field. Under the application of high pressure, Tc is linearly suppressed, which is the typical behavior of classical phonon-mediated superconductors with some additional effect of a pressure-induced decrease in the electronic density of states and the electron-phonon coupling parameters. Structural changes in the layered BaPd2As2 have been studied by means of angle-dispersive diffraction in a diamond-anvil cell. At 12 GPa and 24.2 GPa we observed pressure induced lattice distortions manifesting as the discontinuity and, hence discontinuity in the Birch-Murnaghan equation of state. The bulk modulus is B0 = 40 (6) GPa below 12 GPa and B0 =more » 142 (3) GPa below 27.2 GPa.« less

Authors:
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [7];  [8];  [8];  [9];  [9];  [9];  [6];  [3];  [10];  [11]
  1. Center for High Pressure Science and Technology Advanced Research, Beijing (China); Goethe Univ. Frankfurt (Germany); National Univ. of Science and Technology “MISiS,” Moscow (Russia)
  2. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  3. The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
  4. Ural Federal Univ., Yekaterinburg (Russia)
  5. Fayoum Univ. (Egypt)
  6. Kyushu Inst. of Technology, Kitakyushu (Japan)
  7. East China Normal Univ., Shanghai (China)
  8. Chinese Academy of Sciences (CAS), Beijing (China)
  9. Russian Academy of Sciences, Moscow (Russia)
  10. Goethe Univ. Frankfurt (Germany)
  11. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Washington, Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); RSCF; Ministry of Education and Science of Russia; Government of Russia
OSTI Identifier:
1435814
Alternate Identifier(s):
OSTI ID: 1432904
Grant/Contract Number:  
AC02-06CH11357; FG02-99ER45775; NA0001974; 1642-01100; K2-2017-084; 02.A03.21.0004
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; order parameters; phase diagrams; pressure effects; superconducting gap; superconductors; condensed matter & materials physics

Citation Formats

Abdel-Hafiez, M., Zhao, Y., Huang, Z., Cho, C. -w., Wong, C. H., Hassen, A., Ohkuma, M., Fang, Y. -W., Pan, B. -J., Ren, Z. -A., Sadakov, A., Usoltsev, A., Pudalov, V., Mito, M., Lortz, R., Krellner, C., and Yang, W. High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.134508.
Abdel-Hafiez, M., Zhao, Y., Huang, Z., Cho, C. -w., Wong, C. H., Hassen, A., Ohkuma, M., Fang, Y. -W., Pan, B. -J., Ren, Z. -A., Sadakov, A., Usoltsev, A., Pudalov, V., Mito, M., Lortz, R., Krellner, C., & Yang, W. High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2. United States. doi:10.1103/PhysRevB.97.134508.
Abdel-Hafiez, M., Zhao, Y., Huang, Z., Cho, C. -w., Wong, C. H., Hassen, A., Ohkuma, M., Fang, Y. -W., Pan, B. -J., Ren, Z. -A., Sadakov, A., Usoltsev, A., Pudalov, V., Mito, M., Lortz, R., Krellner, C., and Yang, W. Thu . "High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2". United States. doi:10.1103/PhysRevB.97.134508. https://www.osti.gov/servlets/purl/1435814.
@article{osti_1435814,
title = {High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2},
author = {Abdel-Hafiez, M. and Zhao, Y. and Huang, Z. and Cho, C. -w. and Wong, C. H. and Hassen, A. and Ohkuma, M. and Fang, Y. -W. and Pan, B. -J. and Ren, Z. -A. and Sadakov, A. and Usoltsev, A. and Pudalov, V. and Mito, M. and Lortz, R. and Krellner, C. and Yang, W.},
abstractNote = {While the layered 122 iron arsenide superconductors are highly anisotropic, unconventional, and exhibit several forms of electronic orders that coexist or compete with superconductivity in different regions of their phase diagrams, we find in the absence of iron in the structure that the superconducting characteristics of the end member BaPd2As2 are surprisingly conventional. Here we report on complementary measurements of specific heat, magnetic susceptibility, resistivity measurements, Andreev spectroscopy, and synchrotron high pressure x-ray diffraction measurements supplemented with theoretical calculations for BaPd2As2. Its superconducting properties are completely isotropic as demonstrated by the critical fields, which do not depend on the direction of the applied field. Under the application of high pressure, Tc is linearly suppressed, which is the typical behavior of classical phonon-mediated superconductors with some additional effect of a pressure-induced decrease in the electronic density of states and the electron-phonon coupling parameters. Structural changes in the layered BaPd2As2 have been studied by means of angle-dispersive diffraction in a diamond-anvil cell. At 12 GPa and 24.2 GPa we observed pressure induced lattice distortions manifesting as the discontinuity and, hence discontinuity in the Birch-Murnaghan equation of state. The bulk modulus is B0 = 40 (6) GPa below 12 GPa and B0 = 142 (3) GPa below 27.2 GPa.},
doi = {10.1103/PhysRevB.97.134508},
journal = {Physical Review B},
number = 13,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

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