Anisotropic phase diagram and superconducting fluctuations of single-crystalline SmFeAsO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.85</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>F<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.15</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Welp, U.; Chaparro, Carlos; Koshelev, A. E.; Kwok, W. K.; Rydh, Andreas; Zhigadlo, N. D.; Karpiński, J.; Weyeneth, S.

doi:10.1103/physrevb.83.100513

Cited by 49 publications

(64 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For all compounds of iron based superconductors, the anisotropy ratio γ at T c (0) is in the range 2 to 5, similar to our finding in BaK122, with Ca 10 (Pt 3 As 8 )(( Fe 1−x Pt x ) 2 As 2 ) 5 with x = 0.09 [77], SmFeAsO 0.85 F 0.15 [78] and LaFe 0.92 Co 0.08 AsO [79] being exceptions, with γ ≈ 7 to 8.…”

Section: Doping Evolution Of the Anisotropy Parameter γsupporting

confidence: 70%

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)Fe
Liu
¹
,
Tanatar
²
,
Straszheim
³

et al. 2014
Phys. Rev. B
62
15
72
2
View full text Add to dashboard Cite

Large high-quality single crystals of hole-doped iron-based superconductor (Ba1-xKx)Fe2As2 were grown over a broad composition range 0.22 <= x <= 1 by inverted temperature gradient method. We found that high soaking temperature, fast cooling rate, and an adjusted temperature window of the growth are necessary to obtain single crystals of heavily K-doped crystals (0.65 <= x <= 0.92) with narrow compositional distributions as revealed by sharp superconducting transitions in magnetization measurements and close to 100% superconducting volume fraction. The crystals were extensively characterized by x-ray and compositional analysis, revealing monotonic evolution of the c-axis crystal lattice parameter with K substitution. Quantitative measurements of the temperature-dependent in-plane resistivity rho(T) found doping-independent, constant within error bars, resistivity at room temperature, rho(300 K), in sharp contrast with the significant doping dependence in electron and isovalent substituted BaFe2As2 based compositions. The shape of the temperature-dependent resistivity, rho(T), shows systematic dopingevolution, being close to T-2 in overdoped and revealing significant contribution of the T-linear component at optimum doping. The slope of the upper critical field, d H-c2/dT, scales linearly with T-c for both H parallel to c, H-c2,(c), and H parallel to ab, H-c2,H-ab. The anisotropy of the upper critical field. equivalent to Hc(2,ab)/H-c2,H-c determined near zero-field T-c increases from similar to 2 to 4-5 with increasing K doping level from optimal x similar to 0.4 to strongly overdoped x = 1. Large high-quality single crystals of hole-doped iron-based superconductor (Ba 1−x K x )Fe 2 As 2 were grown over a broad composition range 0.22 x 1 by inverted temperature gradient method. We found that high soaking temperature, fast cooling rate, and an adjusted temperature window of the growth are necessary to obtain single crystals of heavily K-doped crystals (0.65 x 0.92) with narrow compositional distributions as revealed by sharp superconducting transitions in magnetization measurements and close to 100% superconducting volume fraction. The crystals were extensively characterized by x-ray and compositional analysis, revealing monotonic evolution of the c-axis crystal lattice parameter with K substitution. Quantitative measurements of the temperature-dependent in-plane resistivity ρ(T ) found doping-independent, constant within error bars, resistivity at room temperature, ρ(300 K), in sharp contrast with the significant doping dependence in electron and isovalent substituted BaFe 2 As 2 based compositions. The shape of the temperature-dependent resistivity, ρ(T ), shows systematic doping-evolution, being close to T 2 in overdoped and revealing significant contribution of the T -linear component at optimum doping. The slope of the upper critical field, dH c2 /dT , scales linearly with T c for both H c, H c2,c , and H ab, H c2,ab . The anisotropy of the upper critical field γ ≡ H c2,ab /H c2,c determined near z...

show abstract

Section: Doping Evolution Of the Anisotropy Parameter γsupporting

confidence: 70%

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)Fe
Liu
¹
,
Tanatar
²
,
Straszheim
³

et al. 2014
Phys. Rev. B
62
15
72
2
View full text Add to dashboard Cite

show abstract

“…3a. Subtraction of the normal state background as described in detail in Welp et al 16 yields the superconducting specific heat near the transition as shown in Fig. 3b for the pristine and B F ¼ 4 T irradiated sample no.…”

Section: Resultsmentioning

confidence: 99%

Huge critical current density and tailored superconducting anisotropy in SmFeAsO0.8F0.15 by low-density columnar-defect incorporation

et al. 2013

Self Cite

View full text Add to dashboard Cite

Iron-based superconductors could be useful for electricity distribution and superconducting magnet applications because of their relatively high critical current densities and upper critical fields. SmFeAsO 0.8 F 0.15 is of particular interest as it has the highest transition temperature among these materials. Here we show that by introducing a low density of correlated nano-scale defects into this material by heavy-ion irradiation, we can increase its critical current density to up to 2 Â 10 7 A cm À 2 at 5 K-the highest ever reported for an ironbased superconductor-without reducing its critical temperature of 50 K. We also observe a notable reduction in the thermodynamic superconducting anisotropy, from 8 to 4 upon irradiation. We develop a model based on anisotropic electron scattering that predicts that the superconducting anisotropy can be tailored via correlated defects in semimetallic, fully gapped type II superconductors.

show abstract

“…BaFe 2 (As 1-x P x ) 2 , and in strongly scattering charge doped compounds. A notable exception from this scaling is Sm-1111 [17] for which the specific heat anomaly is roughly a factor of 10 too small as compared to the BNC-scaling.…”

mentioning

confidence: 94%

Doping dependence of the specific heat of single-crystal BaFe2(As1−xPx
Chaparro
¹
,
Fang
²
,
Claus
³

et al. 2012
Phys. Rev. B
Self Cite
50
12
39
0
View full text Add to dashboard Cite

Anisotropic phase diagram and superconducting fluctuations of single-crystalline SmFeAsO0.85F0.15

Cited by 49 publications

References 49 publications

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)Fe
Liu
¹
,
Tanatar
²
,
Straszheim
³

et al. 2014
Phys. Rev. B
62
15
72
2
View full text Add to dashboard Cite

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)Fe
Liu
¹
,
Tanatar
²
,
Straszheim
³

et al. 2014
Phys. Rev. B
62
15
72
2
View full text Add to dashboard Cite

Huge critical current density and tailored superconducting anisotropy in SmFeAsO0.8F0.15 by low-density columnar-defect incorporation

Doping dependence of the specific heat of single-crystal BaFe2(As1−xPx
Chaparro
¹
,
Fang
²
,
Claus
³

et al. 2012
Phys. Rev. B
Self Cite
50
12
39
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Anisotropic phase diagram and superconducting fluctuations of single-crystalline SmFeAsO0.85F0.15

Cited by 49 publications

References 49 publications

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)FeLiu1, Tanatar2, Straszheim3 et al. 2014Phys. Rev. B6215722View full textAdd to dashboardCite

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)FeLiu1, Tanatar2, Straszheim3 et al. 2014Phys. Rev. B6215722View full textAdd to dashboardCite

Huge critical current density and tailored superconducting anisotropy in SmFeAsO0.8F0.15 by low-density columnar-defect incorporation

Doping dependence of the specific heat of single-crystal BaFe2(As1−xPxChaparro1, Fang2, Claus3 et al. 2012Phys. Rev. BSelf Cite5012390View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)Fe
Liu
¹
,
Tanatar
²
,
Straszheim
³

et al. 2014
Phys. Rev. B
62
15
72
2
View full text Add to dashboard Cite

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba1−xKx)Fe
Liu
¹
,
Tanatar
²
,
Straszheim
³

et al. 2014
Phys. Rev. B
62
15
72
2
View full text Add to dashboard Cite

Doping dependence of the specific heat of single-crystal BaFe2(As1−xPx
Chaparro
¹
,
Fang
²
,
Claus
³

et al. 2012
Phys. Rev. B
Self Cite
50
12
39
0
View full text Add to dashboard Cite