Introduction

Sergey L. Bud'ko, Duck Young Chung, Daniel Bugaris, Helmut Claus, Mercouri G Kanatzidis, Paul C. Canfield

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure, and the jump in the heat capacity associated with the superconducting transition as a function of Na doping in the Ba1-xNaxFe2As2 family of iron-based superconductors. For Na concentrations 0.15≤x≤0.9, the jump in specific heat at Tc, ΔCp|Tc, follows the ΔCpâ̂ T3 (the so-called BNC scaling) found for most BaFe2As2-based superconductors. This finding suggests that, unlike the related Ba1-xKxFe2As2 series, there is no significant modification of the superconducting state (e.g., change in superconducting gap symmetry) in the Ba1-xNaxFe2As2 series over the whole studied Na concentration range. Pressure dependencies are nonmonotonic for x=0.2 and 0.24. For other Na concentrations, Tc decreases under pressure in an almost linear fashion. The anomalous behavior of the x=0.2 and 0.24 samples under pressure is possibly due to the crossing of the phase boundaries of the narrow antiferromagnetic tetragonal phase, unique for the Ba1-xNaxFe2As2 series, with the application of pressure. The negative sign of the pressure derivatives of Tc across the whole superconducting dome (except for x=0.2) is a clear indication of the nonequivalence of substitution and pressure for the Ba1-xNaxFe2As2 series.

Original languageEnglish
Article number014510
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number1
DOIs
Publication statusPublished - Jan 16 2014

Fingerprint

Specific heat
specific heat
Domes
Phase boundaries
Hydrostatic pressure
domes
hydrostatic pressure
Superconducting materials
indication
Substitution reactions
Doping (additives)
substitutes
Derivatives
scaling
iron
symmetry
Iron-based Superconductors

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Bud'ko, S. L., Chung, D. Y., Bugaris, D., Claus, H., Kanatzidis, M. G., & Canfield, P. C. (2014). Introduction. Physical Review B - Condensed Matter and Materials Physics, 89(1), [014510]. https://doi.org/10.1103/PhysRevB.89.014510

Introduction. / Bud'ko, Sergey L.; Chung, Duck Young; Bugaris, Daniel; Claus, Helmut; Kanatzidis, Mercouri G; Canfield, Paul C.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 1, 014510, 16.01.2014.

Research output: Contribution to journalArticle

Bud'ko, SL, Chung, DY, Bugaris, D, Claus, H, Kanatzidis, MG & Canfield, PC 2014, 'Introduction', Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 1, 014510. https://doi.org/10.1103/PhysRevB.89.014510
Bud'ko SL, Chung DY, Bugaris D, Claus H, Kanatzidis MG, Canfield PC. Introduction. Physical Review B - Condensed Matter and Materials Physics. 2014 Jan 16;89(1). 014510. https://doi.org/10.1103/PhysRevB.89.014510
Bud'ko, Sergey L. ; Chung, Duck Young ; Bugaris, Daniel ; Claus, Helmut ; Kanatzidis, Mercouri G ; Canfield, Paul C. / Introduction. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 89, No. 1.
@article{cc3df17d46e849a38dd1a43aeb201df9,
title = "Introduction",
abstract = "We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure, and the jump in the heat capacity associated with the superconducting transition as a function of Na doping in the Ba1-xNaxFe2As2 family of iron-based superconductors. For Na concentrations 0.15≤x≤0.9, the jump in specific heat at Tc, ΔCp|Tc, follows the ΔCp{\^a}̂ T3 (the so-called BNC scaling) found for most BaFe2As2-based superconductors. This finding suggests that, unlike the related Ba1-xKxFe2As2 series, there is no significant modification of the superconducting state (e.g., change in superconducting gap symmetry) in the Ba1-xNaxFe2As2 series over the whole studied Na concentration range. Pressure dependencies are nonmonotonic for x=0.2 and 0.24. For other Na concentrations, Tc decreases under pressure in an almost linear fashion. The anomalous behavior of the x=0.2 and 0.24 samples under pressure is possibly due to the crossing of the phase boundaries of the narrow antiferromagnetic tetragonal phase, unique for the Ba1-xNaxFe2As2 series, with the application of pressure. The negative sign of the pressure derivatives of Tc across the whole superconducting dome (except for x=0.2) is a clear indication of the nonequivalence of substitution and pressure for the Ba1-xNaxFe2As2 series.",
author = "Bud'ko, {Sergey L.} and Chung, {Duck Young} and Daniel Bugaris and Helmut Claus and Kanatzidis, {Mercouri G} and Canfield, {Paul C.}",
year = "2014",
month = "1",
day = "16",
doi = "10.1103/PhysRevB.89.014510",
language = "English",
volume = "89",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "1",

}

TY - JOUR

T1 - Introduction

AU - Bud'ko, Sergey L.

AU - Chung, Duck Young

AU - Bugaris, Daniel

AU - Claus, Helmut

AU - Kanatzidis, Mercouri G

AU - Canfield, Paul C.

PY - 2014/1/16

Y1 - 2014/1/16

N2 - We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure, and the jump in the heat capacity associated with the superconducting transition as a function of Na doping in the Ba1-xNaxFe2As2 family of iron-based superconductors. For Na concentrations 0.15≤x≤0.9, the jump in specific heat at Tc, ΔCp|Tc, follows the ΔCpâ̂ T3 (the so-called BNC scaling) found for most BaFe2As2-based superconductors. This finding suggests that, unlike the related Ba1-xKxFe2As2 series, there is no significant modification of the superconducting state (e.g., change in superconducting gap symmetry) in the Ba1-xNaxFe2As2 series over the whole studied Na concentration range. Pressure dependencies are nonmonotonic for x=0.2 and 0.24. For other Na concentrations, Tc decreases under pressure in an almost linear fashion. The anomalous behavior of the x=0.2 and 0.24 samples under pressure is possibly due to the crossing of the phase boundaries of the narrow antiferromagnetic tetragonal phase, unique for the Ba1-xNaxFe2As2 series, with the application of pressure. The negative sign of the pressure derivatives of Tc across the whole superconducting dome (except for x=0.2) is a clear indication of the nonequivalence of substitution and pressure for the Ba1-xNaxFe2As2 series.

AB - We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure, and the jump in the heat capacity associated with the superconducting transition as a function of Na doping in the Ba1-xNaxFe2As2 family of iron-based superconductors. For Na concentrations 0.15≤x≤0.9, the jump in specific heat at Tc, ΔCp|Tc, follows the ΔCpâ̂ T3 (the so-called BNC scaling) found for most BaFe2As2-based superconductors. This finding suggests that, unlike the related Ba1-xKxFe2As2 series, there is no significant modification of the superconducting state (e.g., change in superconducting gap symmetry) in the Ba1-xNaxFe2As2 series over the whole studied Na concentration range. Pressure dependencies are nonmonotonic for x=0.2 and 0.24. For other Na concentrations, Tc decreases under pressure in an almost linear fashion. The anomalous behavior of the x=0.2 and 0.24 samples under pressure is possibly due to the crossing of the phase boundaries of the narrow antiferromagnetic tetragonal phase, unique for the Ba1-xNaxFe2As2 series, with the application of pressure. The negative sign of the pressure derivatives of Tc across the whole superconducting dome (except for x=0.2) is a clear indication of the nonequivalence of substitution and pressure for the Ba1-xNaxFe2As2 series.

UR - http://www.scopus.com/inward/record.url?scp=84892922890&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84892922890&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.89.014510

DO - 10.1103/PhysRevB.89.014510

M3 - Article

VL - 89

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 1

M1 - 014510

ER -