Superconductivity with broken time-reversal symmetry in ion-irradiated 
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Grinenko, V.; Materne, Philipp; Sarkar, Rajib; Luetkens, H.; Kihou, Kunihiro; Lee, Chul‐Ho; Akhmadaliev, Shavkat; Efremov, D. V.; Drechsler, S.‐L.; Klauß, H.‐H.

doi:10.1103/physrevb.95.214511

Cited by 57 publications

(48 citation statements)

References 54 publications

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“…Additionally, heat capacity anomalies at the transition to the s+is state have been found to be suppressed at temperatures below T c . These findings are in line with the recent experimental data suggesting the presence of s + is state in overdoped Ba 1−x K x Fe 2 As 2 at x = 0.73 61 , close to the doping where the Lifshitz transition is expected to occur 38,40 . A large broadening of the s + is-region has been found due to the chemical potential renormalization in the superconducting state (BCS-BEC corrections), previously unaccounted for.…”

Section: Discussionsupporting

confidence: 92%

“…Nevertheless, the onset temperatures of the s + is state in Fig.3 are still well separated from T c for most dopings, consistent with the experimental observations of Ref. 61. Note also that the electron bands are incipient in the s + is region; i.e.…”

Section: Fig 3 Phase Diagram As Function Of Temperature (T ) and Dosupporting

confidence: 89%

“…Consequently, one can expect that for T s+is well below T c the discontinuity in the specific heat to be relatively small. Together with inevitable sample inhomogeneity 71,72 , which can significantly smear T s+is due to local variation of the doping level, this provides a possible explanation for the absence of features in C V at T s+is in the recent experimental data 61 .…”

Section: Fig 3 Phase Diagram As Function Of Temperature (T ) and Domentioning

confidence: 95%

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s+is superconductivity with incipient bands: Doping dependence and STM signatures

et al. 2017

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Motivated by the recent observations of small Fermi energies and comparatively large superconducting gaps, present also on bands not crossing the Fermi energy (incipient bands) in iron-based superconductors, we analyze the doping evolution of superconductivity in a four-band model across the Lifshitz transition including BCS-BEC crossover effects on the shallow bands. Similar to the BCS case, we find that with hole doping the phase difference between superconducting order parameters of the hole bands change from 0 to π through an intermediate s + is state, breaking time-reversal symmetry (TRS). The transition, however, occurs in the region where electron bands are incipient and chemical potential renormalization in the superconducting state leads to a significant broadening of the s + is region. We further present the qualitative features of the s + is state that can be observed in scanning tunneling microscopy (STM) experiments, also taking incipient bands into account.

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Section: Discussionsupporting

confidence: 92%

Section: Fig 3 Phase Diagram As Function Of Temperature (T ) and Dosupporting

confidence: 89%

Section: Fig 3 Phase Diagram As Function Of Temperature (T ) and Domentioning

confidence: 95%

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s+is superconductivity with incipient bands: Doping dependence and STM signatures

et al. 2017

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“…Magnetic susceptibilities for several less hole doped (Ba,K)‐122 systems but exhibiting nevertheless a broad maximum around 120 K similarly as the strongly overdoped K‐122 in contradiction with the expected strongly hole doping dependent freezing temperature

T^{*}

which separates bad metal behavior at high temperature from the Fermi liquid one at very low ‐temperature for the total multiband system according to the interpetation suggested by Hardy et al . Taken from V. Grinenko et al . …”

Section: Afe2as2 a = K Rb Cs Puzzles –A Challenge For Theorymentioning

confidence: 82%

Constraints on the total coupling strengthto bosons in the iron based superconductors

Drechsler

Johnston

Grinenko

et al. 2017

Phys. Status Solidi B

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Despite the fact that the Fe-based superconductors (FeSCs) were discovered nearly ten years ago, the community is still devoting a tremendous effort towards elucidating their relevant microscopic pairing mechanism(s) and interactions. At present, there is still no consistent interpretation of their normal state properties, where the strength of the electron-electron interaction and the role of correlation effects are under debate. Here, we examine several common materials and illustrate various problems and concepts that are generic for all FeSCs. Based on empirical observations and qualitative insight from density functional theory, we show that the superconducting and low-energy thermodynamic properties of the FeSCs can be described semi-quantitively within multiband Eliashberg theory. We account for an important high-energy mass renormalization phenomenologically, and in agreement with constraints provided by thermodynamic, optical, and angle-resolved photoemission data. When seen in this way, all FeSCs with T c < 40 K studied so far are found to belong to an intermediate coupling regime. This finding is in contrast to the strong coupling scenarios proposed in the early period of the FeSC history. We also discuss several related issues, including the role of band shifts as measured by the positions of van Hove singularities, and the nature of a recently suggested quantum critical point in the strongly hole-doped systems AFe 2 As 2 (A = K, Rb, Cs). Using high-precision full relativistic GGA-band structure calculations, we arrive at a somewhat milder mass renormalization in comparison with previous studies. From the calculated mass anisotropies of all Fermi surface sheets, only the ε-pocket near the corner of the BZ is compatible with the experimentally observed anisotropy of the upper critical field, pointing to its dominant role in the superconductivity of these three compounds.

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“…The most of available experimental data are consistent with this picture. So far we have found that only hole overdoped Ba 1−x K x Fe 2 As 2 system that breaks time reversal symmetry in the superconducting state cannot be described by a two-band model [47]. In this case, a three-band model is needed to describe the superconducting properties [48].…”

Section: The Slope Of H C2 At T C Interpreted By a Single-band Modelmentioning

confidence: 99%

Universal scaling behavior of the upper critical field in strained FeSe_0.7Te_0.3 thin films

et al. 2018

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Revealing the universal behaviors of iron-based superconductors (FBS) is important to elucidate the microscopic theory of superconductivity. In this work, we investigate the effect of in-plane strain on the slope of the upper critical field H c2 at the superconducting transition temperature T c (i.e. −dH c2 /dT) for FeSe 0.7 Te 0.3 thin films. The in-plane strain tunes T c in a broad range, while the composition and disorder are almost unchanged. We show that −dH c2 /dT scales linearly with T c , indicating that FeSe 0.7 Te 0.3 follows the same universal behavior as observed for pnictide FBS. The observed behavior is consistent with a multiband superconductivity paired by interband interaction such as sign change s ± superconductivity.

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Superconductivity with broken time-reversal symmetry in ion-irradiated Ba0.27K0.73

Cited by 57 publications

References 54 publications

s+is superconductivity with incipient bands: Doping dependence and STM signatures

s+is superconductivity with incipient bands: Doping dependence and STM signatures

Constraints on the total coupling strengthto bosons in the iron based superconductors

Universal scaling behavior of the upper critical field in strained FeSe_0.7Te_0.3 thin films

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Superconductivity with broken time-reversal symmetry in ion-irradiated Ba0.27K0.73

Cited by 57 publications

References 54 publications

s+is superconductivity with incipient bands: Doping dependence and STM signatures

s+is superconductivity with incipient bands: Doping dependence and STM signatures

Constraints on the total coupling strengthto bosons in the iron based superconductors

Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films

Contact Info

Product

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Universal scaling behavior of the upper critical field in strained FeSe_0.7Te_0.3 thin films