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Title: Superconductivity in Y 7 R u 4 InG e 12

Abstract

We report a type-II intermetallic superconductor Y7Ru4InGe12 with a transition temperature (Tc) of ~5.8 K, which is confirmed by zero resistivity, diamagnetic magnetic susceptibility, and specific-heat jump. Single crystals of Y7Ru4InGe12 were grown from a reactive indium flux. Y7Ru4InGe12 crystallizes in the tetragonal space group P4/m and features a [Ru4InGe12] polyanionic network with Y atoms located in three different channels. The upper critical fields of Y7Ru4InGe12 at 0 K are determined to be ~5.3 and 2.4 T along the c axis and the ab plane, respectively. The estimated coherence length along the c axis (~174 Å) is much larger than the estimated mean free path along the c axis (~29 Å) in Y7Ru4InGe12, placing its superconductivity in the so-called dirty regime. The compound exhibits a large superconducting specific-heat jump ΔC/γeTc ≈ 2.4, significantly well above the weak-coupling Barden-Cooper-Schrieffer theoretical value of 1.43 and pointing to a strong-coupling scenario in Y7Ru4InGe12. As a result, density-functional-theory calculations show that the density of states in Y7Ru4InGe12 exhibits a broad peak near the Fermi level which mainly derives from Y–4d,Ru–4d, and Ge–4p states.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, 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)
OSTI Identifier:
1497390
Alternate Identifier(s):
OSTI ID: 1494387
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 2; 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

Bao, Jin -Ke, Bugaris, Daniel E., Zheng, Huihuo, Willa, Kristin, Welp, Ulrich, Chung, Duck Young, and Kanatzidis, Mercouri G. Superconductivity in Y7Ru4InGe12. United States: N. p., 2019. Web. doi:10.1103/PhysRevMaterials.3.024802.
Bao, Jin -Ke, Bugaris, Daniel E., Zheng, Huihuo, Willa, Kristin, Welp, Ulrich, Chung, Duck Young, & Kanatzidis, Mercouri G. Superconductivity in Y7Ru4InGe12. United States. doi:10.1103/PhysRevMaterials.3.024802.
Bao, Jin -Ke, Bugaris, Daniel E., Zheng, Huihuo, Willa, Kristin, Welp, Ulrich, Chung, Duck Young, and Kanatzidis, Mercouri G. Tue . "Superconductivity in Y7Ru4InGe12". United States. doi:10.1103/PhysRevMaterials.3.024802. https://www.osti.gov/servlets/purl/1497390.
@article{osti_1497390,
title = {Superconductivity in Y7Ru4InGe12},
author = {Bao, Jin -Ke and Bugaris, Daniel E. and Zheng, Huihuo and Willa, Kristin and Welp, Ulrich and Chung, Duck Young and Kanatzidis, Mercouri G.},
abstractNote = {We report a type-II intermetallic superconductor Y7Ru4InGe12 with a transition temperature (Tc) of ~5.8 K, which is confirmed by zero resistivity, diamagnetic magnetic susceptibility, and specific-heat jump. Single crystals of Y7Ru4InGe12 were grown from a reactive indium flux. Y7Ru4InGe12 crystallizes in the tetragonal space group P4/m and features a [Ru4InGe12] polyanionic network with Y atoms located in three different channels. The upper critical fields of Y7Ru4InGe12 at 0 K are determined to be ~5.3 and 2.4 T along the c axis and the ab plane, respectively. The estimated coherence length along the c axis (~174 Å) is much larger than the estimated mean free path along the c axis (~29 Å) in Y7Ru4InGe12, placing its superconductivity in the so-called dirty regime. The compound exhibits a large superconducting specific-heat jump ΔC/γeTc ≈ 2.4, significantly well above the weak-coupling Barden-Cooper-Schrieffer theoretical value of 1.43 and pointing to a strong-coupling scenario in Y7Ru4InGe12. As a result, density-functional-theory calculations show that the density of states in Y7Ru4InGe12 exhibits a broad peak near the Fermi level which mainly derives from Y–4d,Ru–4d, and Ge–4p states.},
doi = {10.1103/PhysRevMaterials.3.024802},
journal = {Physical Review Materials},
number = 2,
volume = 3,
place = {United States},
year = {2019},
month = {2}
}

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    journal, February 2018

    • Laun, Joachim; Vilela Oliveira, Daniel; Bredow, Thomas
    • Journal of Computational Chemistry, Vol. 39, Issue 19
    • DOI: 10.1002/jcc.25195

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    Superconducting materials classes: Introduction and overview
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    • Hirsch, J. E.; Maple, M. B.; Marsiglio, F.
    • Physica C: Superconductivity and its Applications, Vol. 514
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    CRYSTAL: a computational tool for the ab initio study of the electronic properties of crystals
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    • Dovesi, Roberto; Orlando, Roberto; Civalleri, Bartolomeo
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    Theory of dirty superconductors
    journal, September 1959


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