Superconductivity in the intermetallic pnictide compound Ca 11 Bi 10-x

Mihai Sturza, Fei Han, Christos D. Malliakas, Duck Young Chung, Helmut Claus, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The pnictide phase Ca11Bi10-x shows bulk superconductivity around 2.2 K in temperature-dependent resistivity and magnetic susceptibility data. The compound is a p-type metal with low carrier density of 6.5 × 1018 cm-3. Ca11Bi10-x(x=0.12) was synthesized by the reaction of Ca metal with excess Bi and crystallizes in the tetragonal space group I4/mmm with a = 12.2842(6) Å and c = 17.866(4) Å. The structure of Ca11Bi10 contains three discrete units: isolated Bi atoms, dumbbells, and square planar rings of Bi surrounded by Ca atoms. Vacancies were found in the isolated Bi(1) atoms and square planar Bi4 units of the structure. The Ca11Bi10 system is the first member found to exhibit superconductivity among the intermetallic class M11X10 (M = Ca, Sr, Ba; X = Bi, Sb), suggesting that a broader family of Bi or Sb containing superconductors may exist. Electronic structure density functional theory calculations confirm the metallic nature of the compound with several steep Bi p-orbital bands crossing the Fermi level as well as a single flat band reaching the Fermi level upon the introduction of Bi vacancies.

Original languageEnglish
Article number054512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number5
DOIs
Publication statusPublished - Feb 19 2014

Fingerprint

Group 5A compounds
Superconductivity
Intermetallics
intermetallics
superconductivity
Fermi level
Atoms
Vacancies
Metals
magnetic permeability
atoms
Magnetic susceptibility
metals
Superconducting materials
Electronic structure
Density functional theory
Carrier concentration
density functional theory
electronic structure
orbitals

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Superconductivity in the intermetallic pnictide compound Ca 11 Bi 10-x. / Sturza, Mihai; Han, Fei; Malliakas, Christos D.; Chung, Duck Young; Claus, Helmut; Kanatzidis, Mercouri G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 5, 054512, 19.02.2014.

Research output: Contribution to journalArticle

Sturza, Mihai ; Han, Fei ; Malliakas, Christos D. ; Chung, Duck Young ; Claus, Helmut ; Kanatzidis, Mercouri G. / Superconductivity in the intermetallic pnictide compound Ca 11 Bi 10-x. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 89, No. 5.
@article{5d2589f2096a4ec59fe1642cae59a31c,
title = "Superconductivity in the intermetallic pnictide compound Ca 11 Bi 10-x",
abstract = "The pnictide phase Ca11Bi10-x shows bulk superconductivity around 2.2 K in temperature-dependent resistivity and magnetic susceptibility data. The compound is a p-type metal with low carrier density of 6.5 × 1018 cm-3. Ca11Bi10-x(x=0.12) was synthesized by the reaction of Ca metal with excess Bi and crystallizes in the tetragonal space group I4/mmm with a = 12.2842(6) {\AA} and c = 17.866(4) {\AA}. The structure of Ca11Bi10 contains three discrete units: isolated Bi atoms, dumbbells, and square planar rings of Bi surrounded by Ca atoms. Vacancies were found in the isolated Bi(1) atoms and square planar Bi4 units of the structure. The Ca11Bi10 system is the first member found to exhibit superconductivity among the intermetallic class M11X10 (M = Ca, Sr, Ba; X = Bi, Sb), suggesting that a broader family of Bi or Sb containing superconductors may exist. Electronic structure density functional theory calculations confirm the metallic nature of the compound with several steep Bi p-orbital bands crossing the Fermi level as well as a single flat band reaching the Fermi level upon the introduction of Bi vacancies.",
author = "Mihai Sturza and Fei Han and Malliakas, {Christos D.} and Chung, {Duck Young} and Helmut Claus and Kanatzidis, {Mercouri G}",
year = "2014",
month = "2",
day = "19",
doi = "10.1103/PhysRevB.89.054512",
language = "English",
volume = "89",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "5",

}

TY - JOUR

T1 - Superconductivity in the intermetallic pnictide compound Ca 11 Bi 10-x

AU - Sturza, Mihai

AU - Han, Fei

AU - Malliakas, Christos D.

AU - Chung, Duck Young

AU - Claus, Helmut

AU - Kanatzidis, Mercouri G

PY - 2014/2/19

Y1 - 2014/2/19

N2 - The pnictide phase Ca11Bi10-x shows bulk superconductivity around 2.2 K in temperature-dependent resistivity and magnetic susceptibility data. The compound is a p-type metal with low carrier density of 6.5 × 1018 cm-3. Ca11Bi10-x(x=0.12) was synthesized by the reaction of Ca metal with excess Bi and crystallizes in the tetragonal space group I4/mmm with a = 12.2842(6) Å and c = 17.866(4) Å. The structure of Ca11Bi10 contains three discrete units: isolated Bi atoms, dumbbells, and square planar rings of Bi surrounded by Ca atoms. Vacancies were found in the isolated Bi(1) atoms and square planar Bi4 units of the structure. The Ca11Bi10 system is the first member found to exhibit superconductivity among the intermetallic class M11X10 (M = Ca, Sr, Ba; X = Bi, Sb), suggesting that a broader family of Bi or Sb containing superconductors may exist. Electronic structure density functional theory calculations confirm the metallic nature of the compound with several steep Bi p-orbital bands crossing the Fermi level as well as a single flat band reaching the Fermi level upon the introduction of Bi vacancies.

AB - The pnictide phase Ca11Bi10-x shows bulk superconductivity around 2.2 K in temperature-dependent resistivity and magnetic susceptibility data. The compound is a p-type metal with low carrier density of 6.5 × 1018 cm-3. Ca11Bi10-x(x=0.12) was synthesized by the reaction of Ca metal with excess Bi and crystallizes in the tetragonal space group I4/mmm with a = 12.2842(6) Å and c = 17.866(4) Å. The structure of Ca11Bi10 contains three discrete units: isolated Bi atoms, dumbbells, and square planar rings of Bi surrounded by Ca atoms. Vacancies were found in the isolated Bi(1) atoms and square planar Bi4 units of the structure. The Ca11Bi10 system is the first member found to exhibit superconductivity among the intermetallic class M11X10 (M = Ca, Sr, Ba; X = Bi, Sb), suggesting that a broader family of Bi or Sb containing superconductors may exist. Electronic structure density functional theory calculations confirm the metallic nature of the compound with several steep Bi p-orbital bands crossing the Fermi level as well as a single flat band reaching the Fermi level upon the introduction of Bi vacancies.

UR - http://www.scopus.com/inward/record.url?scp=84897605978&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897605978&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.89.054512

DO - 10.1103/PhysRevB.89.054512

M3 - Article

VL - 89

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 5

M1 - 054512

ER -