Anisotropic phase diagram and strong coupling effects in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ba</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>K</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:m

Welp, U.; Xie, Ren; Koshelev, A. E.; Kwok, W. K.; Luo, Huiqian; Wang, Z. S.; Mu, Gang; Wen, Hao

doi:10.1103/physrevb.79.094505

Cited by 69 publications

(74 citation statements)

References 38 publications

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“…A clear jump was observed at T c in Ba 0.6 K 0.4 Fe 2 As 2 . It is consistent with a previous report [20,21]. However, the jump cannot be seen in Ba 0.2 K 0.8 Fe 2 As 2 .…”

Section: Resultssupporting

confidence: 83%

Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Tanaka

Shirage

Iyo

2009

J Supercond Nov Magn

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We observed the disappearance of the Meissner effect and the specific heat jump in Ba 0.2 K 0.8 Fe 2 As 2 . A crossover of the type of superconducting order parameter can be a source of these phenomena. A quantum phase disorder provides a possible explanation.Keywords Two-band superconductor · Two-component superconductor · Two-component quantum condensation · Soliton · i-soliton · Meissner effect · Specific heat · Fe-based superconductor · SU(2) superconductivity 1 Introduction

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“…A clear jump was observed at T c in Ba 0.6 K 0.4 Fe 2 As 2 . It is consistent with a previous report [20,21]. However, the jump cannot be seen in Ba 0.2 K 0.8 Fe 2 As 2 .…”

Section: Resultssupporting

confidence: 83%

Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Tanaka

Shirage

Iyo

2009

J Supercond Nov Magn

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“…There, the deviation function is plotted by the closed symbols, showing no difference between the data and the theory. For comparison, the deviation function of a (Ba, K)Fe 2 As 2 sample [22] is displayed showing a typical feature related to the two-gap superconductivity. Thus, our heat-capacity measurements clearly show the single s-wave gap superconductivity in the system.…”

Section: Resultsmentioning

confidence: 99%

Single-gap superconductivity inβ−Bi2Pd

et al. 2016

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The β-Bi 2 Pd compound has been proposed as another example of a multigap superconductor [Imai et al., J. Phys. Soc. Jpn. 81, 113708 (2012)]. Here, we report on measurements of several important physical quantities capable of showing a presence of multiple energy gaps on our superconducting single crystals of β-Bi 2 Pd with the critical temperature T c close to 5 K. The calorimetric study via a sensitive ac technique shows a sharp anomaly at the superconducting transition, however only a single energy gap is detected. Also other characteristics inferred from calorimetric measurements as the field dependence of the Sommerfeld coefficient and the temperature and angular dependence of the upper critical magnetic field point unequivocally to standard single s-wave gap superconductivity. The Hall-probe magnetometry provides the same result from the analysis of the temperature dependence of the lower critical field. A single-gapped BCS density of states is detected by the scanning tunneling spectroscopy measurements. Then, the bulk as well as the surface sensitive probes evidence a standard conventional superconductivity in this system where the topologically protected surface states have been recently detected by angle-resolved photoemission spectroscopy [Sakano et al., Nat. Commun. 6, 8595 (2015).].

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“…Experiments on this system includes, local magnetization [3], resistivity and bulk magnetization [4,5], specific heat [6,7,8], magneto-resistance [9], NMR [10], thermalconductivity [11], ARPES [12,13], electronic-relaxation [14], vortex-dynamics [15], combined muon-spin rotation, neutron scattering and magnetic force spectroscopy [16] among others, but fluctuations studies are still lacking, which motivated this investigation.…”

Section: Introductionmentioning

confidence: 99%

Superconducting fluctuations in the reversible magnetization of the iron-pnictideBa1−xKxFe2As

et al. 2009

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We report on isofield magnetization curves obtained as a function of temperature in two single crystals of Ba1−xKxF e2As2 with superconducting transition temperature Tc=28K and 32.7 K. Results obtained for fields above 20 kOe show a well-defined rounding effect on the reversible region extending 1-3 K above Tc(H) masking the transition. This rounding appears to be due to threedimensional critical fluctuations, as the higher field curves obey a well know scaling law for this type of critical fluctuations. We also analyzed the asymptotic behavior of √ M vs.T curves in the reversible region which probes the shape of the gap near Tc(H). Results of the analysis suggests that phase fluctuations are important in Ba1−xKxF e2As2 which is consistent with nodes in the gap.

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Anisotropic phase diagram and strong coupling effects inBa1−xKxFe2As2

Cited by 69 publications

References 38 publications

Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Single-gap superconductivity inβ−Bi2Pd

Superconducting fluctuations in the reversible magnetization of the iron-pnictideBa1−xKxFe2As

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