Superconductivity in Y7Ru4InGe12

Bao, Jin -Ke; Bugaris, Daniel E.; Zheng, Huihuo; Willa, Kristin; Welp, Ulrich; Chung, Duck Young; Kanatzidis, Mercouri G.

doi:10.1103/PhysRevMaterials.3.024802

Title: Superconductivity in $Y_{7} R u_{4} InG e_{12}$

Journal Article · 12 February 2019 · Physical Review Materials

DOI: https://doi.org/10.1103/PhysRevMaterials.3.024802 · OSTI ID:1497390

Bao, Jin -Ke ^[1]; Bugaris, Daniel E. ^[1]; Zheng, Huihuo ^[1]; Willa, Kristin ^[1]; Welp, Ulrich ^[1]; Chung, Duck Young ^[1]; Kanatzidis, Mercouri G. ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)

We report a type-II intermetallic superconductor Y₇Ru₄InGe₁₂ with a transition temperature (T_c) 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/γeT_c ≈ 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.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1497390

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 3; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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