Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)₂As₂ (x=0.20 and 0.46)

Hu, Rongwei; Mun, Eun Deok; Altarawneh, M. M.; Mielke, C. H.; Zapf, V. S.; Bud'ko, S. L.; Canfield, P. C.

doi:10.1103/PhysRevB.85.064511

Title: Upper critical fields and two-band superconductivity in Sr_1-xEu_x(Fe_0.89Co_0.11)₂As₂ (x=0.20 and 0.46)

Abstract

The upper critical fields H_c2(T) of single crystals of Sr_1-xEu_x(Fe₀.₈₉Co₀.₁₁)₂As₂ (x=0.20 and 0.46) were determined by radio-frequency penetration depth measurements in pulsed magnetic fields. H_c2(T) approaches the Pauli limiting field but shows an upward curvature with an enhancement from the orbital limited field, as inferred from the Werthamer-Helfand-Hohenberg theory. We discuss the temperature dependence of the upper critical fields and the decreasing anisotropy using a two-band BCS model.

Authors:: Hu, Rongwei; Mun, Eun Deok; Altarawneh, M. M.; Mielke, C. H.; Zapf, V. S.; Bud'ko, S. L.; Canfield, P. C.

Publication Date:: Mon Feb 13 00:00:00 EST 2012

Sponsoring Org.:: USDOE

OSTI Identifier:: 1099164

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 85 Journal Issue: 6; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Hu, Rongwei, Mun, Eun Deok, Altarawneh, M. M., Mielke, C. H., Zapf, V. S., Bud'ko, S. L., and Canfield, P. C. Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)₂As₂ (x=0.20 and 0.46).  United States: N. p., 2012. 
Web.  doi:10.1103/PhysRevB.85.064511.

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                    Hu, Rongwei, Mun, Eun Deok, Altarawneh, M. M., Mielke, C. H., Zapf, V. S., Bud'ko, S. L., & Canfield, P. C. Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)₂As₂ (x=0.20 and 0.46).  United States.  https://doi.org/10.1103/PhysRevB.85.064511

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                    Hu, Rongwei, Mun, Eun Deok, Altarawneh, M. M., Mielke, C. H., Zapf, V. S., Bud'ko, S. L., and Canfield, P. C. Mon .  
"Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)₂As₂ (x=0.20 and 0.46)".  United States.  https://doi.org/10.1103/PhysRevB.85.064511.

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@article{osti_1099164,

  title        = {Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)₂As₂ (x=0.20 and 0.46)},

  author       = {Hu, Rongwei and Mun, Eun Deok and Altarawneh, M. M. and Mielke, C. H. and Zapf, V. S. and Bud'ko, S. L. and Canfield, P. C.},

  abstractNote = {The upper critical fields Hc2(T) of single crystals of Sr1-xEux(Fe₀.₈₉Co₀.₁₁)₂As₂ (x=0.20 and 0.46) were determined by radio-frequency penetration depth measurements in pulsed magnetic fields. Hc2(T) approaches the Pauli limiting field but shows an upward curvature with an enhancement from the orbital limited field, as inferred from the Werthamer-Helfand-Hohenberg theory. We discuss the temperature dependence of the upper critical fields and the decreasing anisotropy using a two-band BCS model.},

  doi          = {10.1103/PhysRevB.85.064511},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 6,

  volume       = 85,

  place        = {United States},

  year         = {Mon Feb 13 00:00:00 EST 2012},

  month        = {Mon Feb 13 00:00:00 EST 2012}

}

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Title: Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)₂As₂ (x=0.20 and 0.46)

Abstract

Citation Formats

Upper critical field and thermally activated flux flow in LaFeAsO 1− x F x journal, April 2011

Upper critical fields and thermally-activated transport of NdFeAsO 0.7 F 0.3 single crystal journal, November 2008

Upper Limit for the Critical Field in Hard Superconductors journal, September 1962

Compensation of the paramagnetic effect on H c2 by magnetic moments: 700 kG superconductors journal, November 1975

Anisotropic thermodynamic and transport properties of single-crystalline Ba 1 − x K x Fe 2 As 2 ( x = 0 and 0.45) journal, July 2008

Anisotropic H c 2 of K 0.8 Fe 1.76 Se 2 determined up to 60 T journal, March 2011

Temperature and Purity Dependence of the Superconducting Critical Field, H c 2 . III. Electron Spin and Spin-Orbit Effects journal, July 1966

Ultra-High-Field Superconductivity journal, October 1962

Proximity detector circuits: An alternative to tunnel diode oscillators for contactless measurements in pulsed magnetic field environments journal, June 2009

Upper critical fields well above 100 T for the superconductor SmFeAsO 0.85 F 0.15 with T c = 46 K journal, August 2008

Pseudoisotropic Upper Critical Field in Cobalt-Doped SrFe 2 As 2 Epitaxial Films journal, March 2009

Upper critical magnetic field in Ba0.68K0.32Fe2As2 and Ba(Fe0.93Co0.07)2As2 journal, August 2011

Measuring radio frequency properties of materials in pulsed magnetic fields with a tunnel diode oscillator journal, January 2000

Observation of Magnetic-Field-Induced Superconductivity journal, July 1984

Anisotropy of the Upper Critical Field in a Co-Doped BaFe 2 As 2 Single Crystal journal, August 2009

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS) 2 GaCl 4 (BETS≡bis(ethylene-dithio)tetraselenafulvalene) journal, August 2001

Upper critical field and its anisotropy in LiFeAs journal, May 2011

Nearly isotropic superconductivity in (Ba,K)Fe2As2 journal, January 2009

Determination of anisotropic H c 2 up to 60 T in Ba 0.55 K 0.45 Fe 2 As 2 single crystals journal, December 2008

Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields journal, May 2008

Phase diagram of superconductivity and antiferromagnetism in single crystals of Sr(Fe 1 − x Co x ) 2 As 2 and Sr 1 − y Eu y (Fe 0 . 88 Co 0 . 12 ) 2 As 2 journal, March 2011

Very High Critical Field and Superior J c -Field Performance in NdFeAsO 0.82 F 0.18 with T c of 51 K journal, January 2009

Demagnetizing factors for rectangular ferromagnetic prisms journal, March 1998

Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors journal, May 2003

Title: Upper critical fields and two-band superconductivity in Sr_1-xEu_x(Fe_0.89Co_0.11)₂As₂ (x=0.20 and 0.46)

Upper critical field and thermally activated flux flow in LaFeAsO ₁₋ _x F _x
journal, April 2011

Upper critical fields and thermally-activated transport of ${NdFeAsO}_{0.7} F_{0.3}$ single crystal
journal, November 2008

Upper Limit for the Critical Field in Hard Superconductors
journal, September 1962

Compensation of the paramagnetic effect on H _c2 by magnetic moments: 700 kG superconductors
journal, November 1975

Anisotropic thermodynamic and transport properties of single-crystalline ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ ( $x = 0$ and 0.45)
journal, July 2008

Anisotropic $H_{c 2}$ of $K_{0.8}$ Fe $_{1.76}$ Se $_{2}$ determined up to 60 T
journal, March 2011

Temperature and Purity Dependence of the Superconducting Critical Field, $H_{c 2}$ . III. Electron Spin and Spin-Orbit Effects
journal, July 1966

Ultra-High-Field Superconductivity
journal, October 1962

Proximity detector circuits: An alternative to tunnel diode oscillators for contactless measurements in pulsed magnetic field environments
journal, June 2009

Upper critical fields well above 100 T for the superconductor ${SmFeAsO}_{0.85} F_{0.15}$ with $T_{c} = 46 K$
journal, August 2008

Pseudoisotropic Upper Critical Field in Cobalt-Doped ${SrFe}_{2} {As}_{2}$ Epitaxial Films
journal, March 2009

Upper critical magnetic field in Ba0.68K0.32Fe2As2 and Ba(Fe0.93Co0.07)2As2
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journal, January 2000

Observation of Magnetic-Field-Induced Superconductivity
journal, July 1984

Anisotropy of the Upper Critical Field in a Co-Doped BaFe ₂ As ₂ Single Crystal
journal, August 2009

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS) ₂ GaCl ₄ (BETS≡bis(ethylene-dithio)tetraselenafulvalene)
journal, August 2001

Upper critical field and its anisotropy in LiFeAs
journal, May 2011

Nearly isotropic superconductivity in (Ba,K)Fe2As2
journal, January 2009

Determination of anisotropic $H_{c 2}$ up to 60 T in ${Ba}_{0.55} K_{0.45} {Fe}_{2} {As}_{2}$ single crystals
journal, December 2008

Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields
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Phase diagram of superconductivity and antiferromagnetism in single crystals of Sr(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ and Sr $_{1 - y}$ Eu $_{y}$ (Fe $_{0.88}$ Co $_{0.12}$ ) $_{2}$ As $_{2}$
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journal, January 2009

Demagnetizing factors for rectangular ferromagnetic prisms
journal, March 1998

Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
journal, May 2003