The σ-phase superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9

Elizabeth M. Carnicom; Tai Kong; Tomasz Klimczuk; R. J. Cava

doi:10.1016/j.ssc.2018.09.014

The σ-phase superconductors Nb_20.4Rh_5.7Ge_3.9 and Nb_20.4Rh_5.7Si_3.9

Elizabeth M. Carnicom, Tai Kong, Tomasz Klimczuk, R. J. Cava

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We show that the previously unreported ternary σ phases Nb_20.4Rh_5.7Ge_3.9 and Nb_20.4Rh_5.7Si_3.9 are both superconductors with T_c values of approximately 1.9 K. The superconducting transitions were characterized through temperature-dependent magnetic susceptibility, electrical resistance, and specific heat measurements. The Sommerfeld constants, γ for Nb_20.4Rh_5.7Ge_3.9 and Nb_20.4Rh_5.7Si_3.9 are 89(1) mJ mol-f.u.⁻¹K⁻² and 86(1) mJ mol-f.u.⁻¹K⁻² (about 3.0 and 2.9 mJ mol-atom⁻¹ K⁻²), respectively. The normalized specific heat jumps at T_c, ΔC/γT_c, are approximately 1.39 for Nb_20.4Rh_5.7Ge_3.9 and 1.30 for Nb_20.4Rh_5.7Si_3.9, consistent with both materials being weakly coupled BCS type superconductors.

Original language	English (US)
Pages (from-to)	96-101
Number of pages	6
Journal	Solid State Communications
Volume	284-286
DOIs	https://doi.org/10.1016/j.ssc.2018.09.014
State	Published - Dec 2018

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Materials Chemistry

Keywords

A. Sigma phases
C. Disorder
D. Superconductivity
E. Arc-melting

Access to Document

10.1016/j.ssc.2018.09.014

Cite this

@article{ca8afbe2b1c14b6295e6a925c422d4a6,

title = "The σ-phase superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 ",

abstract = "We show that the previously unreported ternary σ phases Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are both superconductors with Tc values of approximately 1.9 K. The superconducting transitions were characterized through temperature-dependent magnetic susceptibility, electrical resistance, and specific heat measurements. The Sommerfeld constants, γ for Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are 89(1) mJ mol-f.u.−1K−2 and 86(1) mJ mol-f.u.−1K−2 (about 3.0 and 2.9 mJ mol-atom−1 K−2), respectively. The normalized specific heat jumps at Tc, ΔC/γTc, are approximately 1.39 for Nb20.4Rh5.7Ge3.9 and 1.30 for Nb20.4Rh5.7Si3.9, consistent with both materials being weakly coupled BCS type superconductors.",

keywords = "A. Sigma phases, C. Disorder, D. Superconductivity, E. Arc-melting",

author = "Carnicom, {Elizabeth M.} and Tai Kong and Tomasz Klimczuk and Cava, {R. J.}",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = dec,

doi = "10.1016/j.ssc.2018.09.014",

language = "English (US)",

volume = "284-286",

pages = "96--101",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Limited",

}

TY - JOUR

T1 - The σ-phase superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9

AU - Carnicom, Elizabeth M.

AU - Kong, Tai

AU - Klimczuk, Tomasz

AU - Cava, R. J.

PY - 2018/12

Y1 - 2018/12

N2 - We show that the previously unreported ternary σ phases Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are both superconductors with Tc values of approximately 1.9 K. The superconducting transitions were characterized through temperature-dependent magnetic susceptibility, electrical resistance, and specific heat measurements. The Sommerfeld constants, γ for Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are 89(1) mJ mol-f.u.−1K−2 and 86(1) mJ mol-f.u.−1K−2 (about 3.0 and 2.9 mJ mol-atom−1 K−2), respectively. The normalized specific heat jumps at Tc, ΔC/γTc, are approximately 1.39 for Nb20.4Rh5.7Ge3.9 and 1.30 for Nb20.4Rh5.7Si3.9, consistent with both materials being weakly coupled BCS type superconductors.

AB - We show that the previously unreported ternary σ phases Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are both superconductors with Tc values of approximately 1.9 K. The superconducting transitions were characterized through temperature-dependent magnetic susceptibility, electrical resistance, and specific heat measurements. The Sommerfeld constants, γ for Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are 89(1) mJ mol-f.u.−1K−2 and 86(1) mJ mol-f.u.−1K−2 (about 3.0 and 2.9 mJ mol-atom−1 K−2), respectively. The normalized specific heat jumps at Tc, ΔC/γTc, are approximately 1.39 for Nb20.4Rh5.7Ge3.9 and 1.30 for Nb20.4Rh5.7Si3.9, consistent with both materials being weakly coupled BCS type superconductors.

KW - A. Sigma phases

KW - C. Disorder

KW - D. Superconductivity

KW - E. Arc-melting

UR - http://www.scopus.com/inward/record.url?scp=85054680856&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054680856&partnerID=8YFLogxK

U2 - 10.1016/j.ssc.2018.09.014

DO - 10.1016/j.ssc.2018.09.014

M3 - Article

AN - SCOPUS:85054680856

SN - 0038-1098

VL - 284-286

SP - 96

EP - 101

JO - Solid State Communications

JF - Solid State Communications

ER -