Local Inhomogeneity and Filamentary Superconductivity in Pr-Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CaFe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>As</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Gofryk, K.; Pan, Minghu; Cantoni, Claudia; Saparov, Bayrammurad; Mitchell, Jonathan E.; Sefat, Athena S.

doi:10.1103/physrevlett.112.047005

Cited by 49 publications

(82 citation statements)

References 41 publications

(53 reference statements)

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“…15 [21,25]. However, no evident diamagnetic behavior could be identified in the magnetic susceptibility in the zero-field cool mode, which suggests the filamentary nature of the superconductivity in this material [25]. These properties are qualitatively consistent with previous reports on Ca 1−x Pr x Fe 2 As 2 [15,23,25].…”

Section: Sample Properties and Experimental Setupsupporting

confidence: 90%

“…We have studied samples with two compositions (x = 0.1 and 0. 15 [21,25]. However, no evident diamagnetic behavior could be identified in the magnetic susceptibility in the zero-field cool mode, which suggests the filamentary nature of the superconductivity in this material [25].…”

Section: Sample Properties and Experimental Setupmentioning

confidence: 85%

“…The Fermi surface nesting between electron and hole Fermi surfaces thus does not exist anymore, which was argued to be responsible for the absence of magnetic fluctuation and superconductivity in the CT phase [16,17]. Ca 1−x Pr x Fe 2 As 2 is one of the several iron pnictides that undergo the collapsed tetragonal transition under ambient pressure upon cooling [8,15,[21][22][23][24][25]. However, little is known about its electronic structure to date.…”

Section: Introductionmentioning

confidence: 99%

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Electronic structure reconstruction ofCa1−xPrxFe2As2in the collapsed tetragonal phas

Shen

Jiang

et al. 2014

Phys. Rev. B

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We report the electronic structure reconstruction of Ca 1−x Pr x Fe 2 As 2 (x = 0.1 and 0.15) in the low temperature collapsed tetragonal (CT) phase observed by angle-resolved photoemission spectroscopy. Different from Ca(Fe 1−x Rh x ) 2 As 2 and the annealed CaFe 2 As 2 where all hole Fermi surfaces are absent in their CT phases, the cylindrical hole Fermi surface can still be observed in the CT phase of Ca 1−x Pr x Fe 2 As 2 . Furthermore, we found at least three well separated electron-like bands around the zone corner in the CT phase of Ca 1−x Pr x Fe 2 As 2 , which are more dispersive than the electron-like bands in the high temperature tetragonal phase. Based on these observations, we propose that the weakening of correlations (as indicated by the reduced effective mass), rather than the lack of Fermi surface nesting, might be responsible for the absence of magnetic ordering and superconductivity in the CT phase.

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Section: Sample Properties and Experimental Setupsupporting

confidence: 90%

Section: Sample Properties and Experimental Setupmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Electronic structure reconstruction ofCa1−xPrxFe2As2in the collapsed tetragonal phas

Shen

Jiang

et al. 2014

Phys. Rev. B

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“…4. On the other hand, Gofryk et al [22] declared that the high-Tc superconductivity emerges from cloverlike defects associated with Pr dopants according to their abundant observations. At first glance, their proposal seems effective to explain both the broad superconducting transition and the weak diamagnetic signal that detected in the present system.…”

Section: Superconductivity Originmentioning

confidence: 99%

“…And the interface SC origin is supported by the extreme magnetic anisotropy [20], accompanied by an unexpected doping-independent Tc and equally unexpected superparamagnetic clusters associated with As vacancies. Meanwhile, Gofryk et al [22] recently demonstrated the presence of inhomogeneity in the crystal through measuring the spatial variation of the praseodymium (Pr) concentration, local density of states, and superconducting order parameter. They ascribed the high-Tc superconductivity to cloverlike defects associated with Pr dopants.…”

Section: Introductionmentioning

confidence: 99%

Review on origin of the unusual high-Tc superconductivity in Ca1−xRExFe2As2 (RE = La, Ce, Pr, Nd)

Zhou¹,

Shi²

2015

Novel Superconducting Materials

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Review on origin of the unusual high-T c superconductivity in Ca 1−x RE x Fe 2 As 2 (RE = La, Ce, Pr, Nd) Abstract: Since the discovery of high temperature superconductivity in iron pnictides in 2008, many iron-based superconductors (IBSs) with various crystal structures have been exploited. Among them, superconductivity with the onset transition temperature Tc up to 49 K has been detected in rare earth element doped CaFe 2 As 2 system (CaRE122). The electron doping induced high Tc values clearly exceed the highest Tcs induced by both hole doping (~38 K) and chemical or physical pressure (~33 K) in the 122-type iron-based superconductors. The occurrence of high-Tc superconductivity in this unique system is quite strange in terms of the much lower Tc observed in the sister compounds bearing structural and chemical similarities. Though the high-Tc superconductivity in Ca 1−x RExFe 2 As 2 is of the non-bulk feature, its superconducting origin served as a most important question has attracted tremendous attentions ever since its discovery. In this review, we summarize the previous experimental results observed in this series of superconductors and list the possible key points that may be related to the understanding of the nature for the strange high-Tc superconductivity.

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Deep Data Analytics in Structural and Functional Imaging of Nanoscale Materials

Ziatdinov

Kalinin

2018

Materials Discovery and Design

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Local Inhomogeneity and Filamentary Superconductivity in Pr-DopedCaFe2As2

Cited by 49 publications

References 41 publications

Electronic structure reconstruction ofCa1−xPrxFe2As2in the collapsed tetragonal phas

Electronic structure reconstruction ofCa1−xPrxFe2As2in the collapsed tetragonal phas

Review on origin of the unusual high-Tc superconductivity in Ca1−xRExFe2As2 (RE = La, Ce, Pr, Nd)

Deep Data Analytics in Structural and Functional Imaging of Nanoscale Materials

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