High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2

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.

doi:10.1103/PhysRevB.97.134508

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

Journal Article · Thu Apr 12 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.134508· OSTI ID:1435814

Abdel-Hafiez, M. ^[1]; Zhao, Y. ^[2]; Huang, Z. ^[3]; Cho, C. -w. ^[3]; Wong, C. H. ^[4]; Hassen, A. ^[5]; Ohkuma, M. ^[6]; Fang, Y. -W. ^[7]; Pan, B. -J. ^[8]; Ren, Z. -A. ^[8]; Sadakov, A. ^[9]; Usoltsev, A. ^[9]; Pudalov, V. ^[9]; Mito, M. ^[6]; Lortz, R. ^[3]; Krellner, C. ^[10]; Yang, W. ^[11]

Center for High Pressure Science and Technology Advanced Research, Beijing (China); Goethe Univ. Frankfurt (Germany); National Univ. of Science and Technology “MISiS,” Moscow (Russia)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
Ural Federal Univ., Yekaterinburg (Russia)
Fayoum Univ. (Egypt)
Kyushu Inst. of Technology, Kitakyushu (Japan)
East China Normal Univ., Shanghai (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Russian Academy of Sciences, Moscow (Russia)
Goethe Univ. Frankfurt (Germany)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Washington, Argonne, IL (United States)

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, T_c 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); RSCF; Ministry of Education and Science of Russia; Government of Russia

Grant/Contract Number:: AC02-06CH11357; FG02-99ER45775; NA0001974; 1642-01100; K2-2017-084; 02.A03.21.0004

OSTI ID:: 1435814

Alternate ID(s):: OSTI ID: 1432904

Journal Information:: Physical Review B, Vol. 97, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 9 works

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

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