Superconductivity in the Nb-Ru-Geσ phase

Carnicom, Elizabeth M.; Xie, Weiwei; Sobczak, Zuzanna; Kong, Tai; Klimczuk, Tomasz; Cava, R. J.

doi:10.1103/PhysRevMaterials.1.074802

Title: Superconductivity in the Nb-Ru-Ge $σ$ phase

Abstract

Here, we show that the previously unreported ternary σ-phase material Nb_20.4Ru_5.7Ge_3.9 (Nb_0.68Ru_0.19Ge_0.13) is a superconductor with a critical temperature of 2.2 K. Temperature-dependent magnetic susceptibility, resistance, and specific heat measurements were used to characterize the superconducting transition. The Sommerfeld constant γ for Nb_20.4Ru_5.7Ge_3.9 is 91 mJ mol-f.u.^-1K^-2 (~3 mJ mol-atom^-1K^-2) and the specific heat anomaly at the superconducting transition, ΔC/γT_c, is approximately 1.38. The zero-temperature upper critical field (µ₀Hc₂(0)) was estimated to be 2 T by resistance data. Field-dependent magnetization data analysis estimated µ₀Hc₁(0) to be 5.5 mT. Thus, the characterization shows Nb_20.4Ru_5.7Ge_3.9 to be a type II BCS superconductor. This material appears to be the first reported ternary phase in the Nb-Ru-Ge system, and the fact that there are no previously reported binary Nb-Ru, Nb-Ge, or Ru-Ge σ-phases shows that all three elements are necessary to stabilize the material. An analogous σ-phase in the Ta-Ru-Ge system did not display superconductivity above 1.7 K, which suggests that electron count cannot govern the superconductivity observed. Preliminary characterization of a possible superconducting σ-phase in the Nb-Ru-Ga system is also reported.

Authors:

Carnicom, Elizabeth M. ^[1]; Xie, Weiwei ^[2]; Sobczak, Zuzanna ^[3]; Kong, Tai ^[1]; Klimczuk, Tomasz ^[3]; Cava, R. J. ^[1]

Princeton Univ., Princeton, NJ (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Gdansk Univ. of Technology, Gdansk (Poland)

Publication Date:: Thu Dec 07 00:00:00 EST 2017

Research Org.:: Princeton Univ., NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1411888

Alternate Identifier(s):: OSTI ID: 1411803

Grant/Contract Number:: FG02-98ER45706

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Materials

Additional Journal Information:: Journal Volume: 1; Journal Issue: 7; Journal ID: ISSN 2475-9953

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Carnicom, Elizabeth M., Xie, Weiwei, Sobczak, Zuzanna, Kong, Tai, Klimczuk, Tomasz, and Cava, R. J. Superconductivity in the Nb-Ru-Geσ phase.  United States: N. p., 2017. 
Web.  doi:10.1103/PhysRevMaterials.1.074802.

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                    Carnicom, Elizabeth M., Xie, Weiwei, Sobczak, Zuzanna, Kong, Tai, Klimczuk, Tomasz, & Cava, R. J. Superconductivity in the Nb-Ru-Geσ phase.  United States.  https://doi.org/10.1103/PhysRevMaterials.1.074802

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                    Carnicom, Elizabeth M., Xie, Weiwei, Sobczak, Zuzanna, Kong, Tai, Klimczuk, Tomasz, and Cava, R. J. Thu .  
"Superconductivity in the Nb-Ru-Geσ phase".  United States.  https://doi.org/10.1103/PhysRevMaterials.1.074802.  https://www.osti.gov/servlets/purl/1411888.

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@article{osti_1411888,

  title        = {Superconductivity in the Nb-Ru-Geσ phase},

  author       = {Carnicom, Elizabeth M. and Xie, Weiwei and Sobczak, Zuzanna and Kong, Tai and Klimczuk, Tomasz and Cava, R. J.},

  abstractNote = {Here, we show that the previously unreported ternary σ-phase material Nb20.4Ru5.7Ge3.9 (Nb0.68Ru0.19Ge0.13) is a superconductor with a critical temperature of 2.2 K. Temperature-dependent magnetic susceptibility, resistance, and specific heat measurements were used to characterize the superconducting transition. The Sommerfeld constant γ for Nb20.4Ru5.7Ge3.9 is 91 mJ mol-f.u.-1K-2 (~3 mJ mol-atom-1K-2) and the specific heat anomaly at the superconducting transition, ΔC/γTc, is approximately 1.38. The zero-temperature upper critical field (µ0Hc2(0)) was estimated to be 2 T by resistance data. Field-dependent magnetization data analysis estimated µ0Hc1(0) to be 5.5 mT. Thus, the characterization shows Nb20.4Ru5.7Ge3.9 to be a type II BCS superconductor. This material appears to be the first reported ternary phase in the Nb-Ru-Ge system, and the fact that there are no previously reported binary Nb-Ru, Nb-Ge, or Ru-Ge σ-phases shows that all three elements are necessary to stabilize the material. An analogous σ-phase in the Ta-Ru-Ge system did not display superconductivity above 1.7 K, which suggests that electron count cannot govern the superconductivity observed. Preliminary characterization of a possible superconducting σ-phase in the Nb-Ru-Ga system is also reported.},

  doi          = {10.1103/PhysRevMaterials.1.074802},

  journal      = {Physical Review Materials},

  number       = 7,

  volume       = 1,

  place        = {United States},

  year         = {Thu Dec 07 00:00:00 EST 2017},

  month        = {Thu Dec 07 00:00:00 EST 2017}

}

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Title: Superconductivity in the Nb-Ru-Ge σ phase

Abstract

Citation Formats

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Superconductivity and resistance behaviour of ?-phase alloys: Nb?Rh and Ta?Rh journal, March 1980

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Overview of Intermetallic Sigma () Phase Precipitation in Stainless Steels journal, January 2012

Comparison of superconducting parameters of A 15- and σ-phases of Nb−Pt journal, March 1978

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Superconductivity in Mo-Re and Nb-Ir σ Phases journal, February 1971

Measurements of critical magnetic fields and resistance for a phase Mo-Re journal, February 1980

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Phase equilibria in the niobium-gallium-manganese system at 900 °C journal, November 1980

Comparison of superconducting and electronic properties of σ-and A-15 phase Nb−Al journal, June 1977

Ordering of atoms in the σ phase journal, March 1956

Transition Temperature of Strong-Coupled Superconductors journal, March 1968

Title: Superconductivity in the Nb-Ru-Ge $σ$ phase

Study of A15 and σ phase alloys in the Nb-V-Ga system
journal, March 1984

Superconductivity and resistance behaviour of ?-phase alloys: Nb?Rh and Ta?Rh
journal, March 1980

A short history of SHELX
journal, December 2007

Temperature and Purity Dependence of the Superconducting Critical Field, $H_{c 2}$ . III. Electron Spin and Spin-Orbit Effects
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Comparison of the Site Occupancies Determined by Combined Rietveld Refinement and Density Functional Theory Calculations: Example of the Ternary Mo–Ni–Re σ Phase
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Overview of Intermetallic Sigma () Phase Precipitation in Stainless Steels
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Comparison of superconducting parameters of A 15- and σ-phases of Nb−Pt
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Crystal structures of the Al–Ti–Pt τ5 and τ6 phases solved by zonal precession electron diffraction
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A resistivity peak close to Tc in Nd2−xCexCuO4−y single crystals
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Superconductivity in the σ and α-Mn structures
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Superconductivity of Technetium Alloys and Compounds
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