Review of annealing effects and superconductivity in Fe1+y Te1−x Se x superconductors

Sun, Yue; Shi, Zhixiang; Tamegai, T.

doi:10.1088/1361-6668/ab30c2

Cited by 70 publications

(69 citation statements)

References 110 publications

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“…Fe 1+y Te 1−x Se x has played a prominent role throughout the "iron age", despite the need to invest considerable effort to control and optimize sample quality, and to decipher the roles of the structural and magnetic order, possible phase separation, and excess Fe ions. These issues, and many others, have been reviewed in several review papers dedicated specifically to this material [343][344][345]. The excess Fe ions, indicated by y in Fe 1+y Te 1−x Se x , lead to a partial occupation of the second Fe site in the crystal, and complicate the characterization of the material since these sites disorder, dope, and locally magnetize the system.…”

Section: Basic Properties Of Fe 1+y Te 1−x Se Xmentioning

confidence: 99%

“…The excess Fe ions, indicated by y in Fe 1+y Te 1−x Se x , lead to a partial occupation of the second Fe site in the crystal, and complicate the characterization of the material since these sites disorder, dope, and locally magnetize the system. For a recent review of the role of Fe non-stoichiometries and annealing effects in Fe 1+y Te 1−x Se x , we refer to reference [344].…”

Section: Basic Properties Of Fe 1+y Te 1−x Se Xmentioning

confidence: 99%

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On the Remarkable Superconductivity of FeSe and Its Close Cousins

2020

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Emergent electronic phenomena in iron-based superconductors have been at the forefront of condensed matter physics for more than a decade. Much has been learned about the origins and intertwined roles of ordered phases, including nematicity, magnetism, and superconductivity, in this fascinating class of materials. In recent years, focus has been centered on the peculiar and highly unusual properties of FeSe and its close cousins. This family of materials has attracted considerable attention due to the discovery of unexpected superconducting gap structures, a wide range of superconducting critical temperatures, and evidence for nontrivial band topology, including associated spin-helical surface states and vortex-induced Majorana bound states. Here, we review superconductivity in iron chalcogenide superconductors, including bulk FeSe, doped bulk FeSe, FeTe1−xSex, intercalated FeSe materials, and monolayer FeSe and FeTe1−xSex on SrTiO3. We focus on the superconducting properties, including a survey of the relevant experimental studies, and a discussion of the different proposed theoretical pairing scenarios. In the last part of the paper, we review the growing recent evidence for nontrivial topological effects in FeSe-related materials, focusing again on interesting implications for superconductivity.

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Section: Basic Properties Of Fe 1+y Te 1−x Se Xmentioning

confidence: 99%

Section: Basic Properties Of Fe 1+y Te 1−x Se Xmentioning

confidence: 99%

On the Remarkable Superconductivity of FeSe and Its Close Cousins

2020

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“…By these methods, a series of Fe 1+y Te 0.8 Se 0.2 and Fe 1+y Te 0.6 Se 0.4 single crystals with different T c were prepared. More details about the crystal preparation, excess Fe, and the basic properties can be seen in a recent review paper [56].…”

Section: Methodsmentioning

confidence: 99%

Achieving the depairing limit along the c axis in Fe1+yTe1−xSe
Sun
¹
,
Ohnuma
²
,
Ayukawa
³

et al. 2020
Phys. Rev. B
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17
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0
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We report the achieving of depairing current limit along c-axis in Fe1+yTe1−xSex single crystals. A series of crystals with Tc ranging from 8.6 K to 13.7 K (different amount of excess Fe, y) were fabricated into c-axis bridges with a square-micrometer cross-section. The critical current density, Jc, was directly estimated from the transport current-voltage measurements. The transport Jc reaches a very large value, which is about one order of magnitude larger than the depinning Jc, but comparable to the calculated depairing Jc ∼ 2 × 10 6 A/cm 2 at 0 K, based on the Ginzburg-Landau (GL) theory. The temperature dependence of the depairing Jc follows the GL-theory (∝ (1-T /Tc) 3/2 ) down to ∼ 0.83 Tc, then increases with a reduced slope at low temperatures, which can be qualitatively described by the Kupriyanov-Lukichev theory. Our study provides a new route to understand the behavior of depairing Jc in iron-based superconductors in a wide temperature range. * sunyue@phys.aoyama.ac.jp † hkitano@phys.aoyama.ac.jp

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“…Spectral gap variation at the surface of the two samples, both a comparable distance away from the bulk superconductor Fe(Te,Se), is likely due to different STM tips used, as well as the variations in Se:Te ratio and the concentration of excess interstitial Fe across different Fe(Te,Se) substrates 45,46,47 . Nevertheless, within a single heterostructure, the measured gap is spatially homogeneous over the nanoscale region measured, with little variation in the spectral shape ( Fig.…”

Section: Nanoscale Structural and Electronic Characterizationmentioning

confidence: 99%

Proximity-induced superconductivity in a topological crystalline insulator

Rachmilowitz

Zhao

et al. 2019

Phys. Rev. B

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Superconducting topological crystalline insulators (TCI) are predicted to host new topological phases protected by crystalline symmetries, but available materials are insufficiently suitable for surface studies. To induce superconductivity at the surface of a prototypical TCI SnTe, we use molecular beam epitaxy to grow a heterostructure of SnTe and a high-Tc superconductor Fe(Te,Se), utilizing a "buffer" layer to bridge the large lattice mismatch between SnTe and Fe(Te,Se). Using low-temperature scanning tunneling microscopy and spectroscopy, we measure a prominent spectral gap on the surface of SnTe, and demonstrate its superconducting origin by its dependence on temperature and magnetic field. Our work provides a new platform for atomic-scale investigations of emergent topological phenomena in superconducting TCIs. Introduction.

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Review of annealing effects and superconductivity in Fe_1+yTe_1−xSe_x superconductors

Abstract: Among iron-based superconductors, Fe 1+y

Cited by 70 publications

References 110 publications

On the Remarkable Superconductivity of FeSe and Its Close Cousins

On the Remarkable Superconductivity of FeSe and Its Close Cousins

Achieving the depairing limit along the c axis in Fe1+yTe1−xSe
Sun
¹
,
Ohnuma
²
,
Ayukawa
³

et al. 2020
Phys. Rev. B
Self Cite
17
0
11
0
View full text Add to dashboard Cite

Proximity-induced superconductivity in a topological crystalline insulator

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Review of annealing effects and superconductivity in Fe1+y Te1−x Se x superconductors

Abstract: Among iron-based superconductors, Fe 1+y

Cited by 70 publications

References 110 publications

On the Remarkable Superconductivity of FeSe and Its Close Cousins

On the Remarkable Superconductivity of FeSe and Its Close Cousins

Achieving the depairing limit along the c axis in Fe1+yTe1−xSeSun1, Ohnuma2, Ayukawa3 et al. 2020Phys. Rev. BSelf Cite170110View full textAdd to dashboardCite

Proximity-induced superconductivity in a topological crystalline insulator

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Review of annealing effects and superconductivity in Fe_1+yTe_1−xSe_x superconductors

Achieving the depairing limit along the c axis in Fe1+yTe1−xSe
Sun
¹
,
Ohnuma
²
,
Ayukawa
³

et al. 2020
Phys. Rev. B
Self Cite
17
0
11
0
View full text Add to dashboard Cite