Novel electronic nematicity in heavily hole-doped iron pnictide superconductors

Ishida, Kousuke; Tsujii, Masaya; Hosoi, Suguru; Mizukami, Y.; Ishida, Shigeyuki; Iyo, A.; Eisaki, H.; Wolf, Thomas; Grube, K.; Löhneysen, H. v.; Fernandes, Rafael M.; Shibauchi, T.

doi:10.1073/pnas.1909172117

Cited by 46 publications

(62 citation statements)

References 36 publications

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“…Very recently, elastoresistance measurements, which can also be used to infer symmetry information on the underlying nematic order parameter, also suggested that a

X Y

‐type of nematic order, that is, a nematic order, which can point in any arbitrary direction, might be realized in a narrow doping window in Ba

_{1 - x}

Rb x Fe 2 As 2 . [ 243 ] The end members of this series show a nematic ground state with so‐called

B_{2 g}

symmetry and one with

B_{1 g}

symmetry, respectively, and thus the new

X Y

‐type nematic order was proposed to form in between these two extreme limits. From band structure calculations, [ 244 ] it was argued that the change of the nematic order with so‐called

B_{2 g}

symmetry in BaFe 2 As 2 to

B_{1 g}

symmetry in RbFe 2 As 2 is related to the change of the magnetic ground state configuration from single stripe to double stripe.…”

Section: Role Of Uniaxial Pressure For Probing and Tuning Electronic mentioning

confidence: 99%

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Gati

Bud’ko

et al. 2020

Annalen der Physik

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Iron-based superconductors are well-known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic, and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal-to-orthorhombic and a collapsed-tetragonal transition. In particular, the widely observed tetragonal-to-orthorhombic transition is believed to be a result of an electronic order that is coupled to the crystalline lattice and is, thus, referred to as nematic transition. Nematicity is therefore a prominent feature of these materials, which signals the importance of the coupling of electronic and lattice properties. Correspondingly, these systems are particularly susceptible to tuning via pressure (hydrostatic, uniaxial, or some combination). Efforts to probe the phase diagrams of pressure-tuned iron-based superconductors are reviewed with a strong focus on recent insights into the phase diagrams of several members of this material class under hydrostatic pressure. These studies on FeSe, Ba(Fe 1−x Co x) 2 As 2 , Ca(Fe 1−x Co x) 2 As 2 , and CaK(Fe 1−x Ni x) 4 As 4 are, to a significant extent, made possible by advances of what measurements can be adapted to their use under differing pressure environments. The potential impact of these tools for the study of the wider class of strongly correlated electron systems is pointed out.

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“…Very recently, elastoresistance measurements, which can also be used to infer symmetry information on the underlying nematic order parameter, also suggested that a

X Y

‐type of nematic order, that is, a nematic order, which can point in any arbitrary direction, might be realized in a narrow doping window in Ba

_{1 - x}

Rb x Fe 2 As 2 . [ 243 ] The end members of this series show a nematic ground state with so‐called

B_{2 g}

symmetry and one with

B_{1 g}

symmetry, respectively, and thus the new

X Y

‐type nematic order was proposed to form in between these two extreme limits. From band structure calculations, [ 244 ] it was argued that the change of the nematic order with so‐called

B_{2 g}

symmetry in BaFe 2 As 2 to

B_{1 g}

symmetry in RbFe 2 As 2 is related to the change of the magnetic ground state configuration from single stripe to double stripe.…”

Section: Role Of Uniaxial Pressure For Probing and Tuning Electronic mentioning

confidence: 99%

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Gati

Bud’ko

et al. 2020

Annalen der Physik

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“…However, the nematicity in Fe-based superconductors recently exhibited a very rich variety beyond the original expectation. Well-known discoveries are nematicity without magnetization in FeSe and nematicity with B 2g symmetry in the heavily hole-doped compound AFe 2 As 2 (A = Cs, Rb) [29][30][31][32][33], which is rotated by 45 • with respect to the nematicity in FeSe. These nematic orders are naturally understood as the ferro-orbital and/or bond orders driven by the interference between spin fluctuations described in Fig.…”

mentioning

confidence: 99%

Hidden antiferronematic order in Fe-based superconductor BaFe2As2 and NaFeAs above TS

Onari

Kontani

2020

Phys. Rev. Research

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In several Fe-based superconductors, slight C 4 symmetry breaking occurs at T * , which is tens of degrees Kelvin higher than the structural transition temperature T S. In this "hidden" nematic state at T S < T < T * , the orthorhombicity is tiny [φ = (a − b)/(a + b) 0.1%], but clear evidence of a bulk phase transition has been accumulated. To explain this long-standing mystery, we propose the emergence of antiferro-bond (AFB) order with the AF wave vector q = (0, π) at T = T * , by which the characteristic phenomena below T * are satisfactorily explained. This AFB order originates from the interorbital nesting between the d xy-orbital hole pocket and the electron pocket, and this interorbital bond order naturally explains the pseudogap, band folding, and tiny nematicity that is linear in T * − T. The hidden AFB order explains key experiments in both BaFe 2 As 2 and NaFeAs, but it is not expected to occur in FeSe because of the absence of the d xy-orbital hole pocket.

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“…6 [41]. Furthermore, elastoresistance measurements in the normal state on this system also revealed a ðπ; πÞ nematicity [44]. ARPES measurements have shown that the Fermi surfaces of the heavily hole-doped FeSCs only have hole pockets centered at the Γ point without electron pockets at the M point [45][46][47].…”

Section: Nematic Superconductivity In 122 Systemmentioning

confidence: 65%

Progress of nematic superconductivity in iron-based superconductors

Wang

Zhou

et al. 2021

Advances in Physics: X

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Despite more than ten years of extensive research, the superconducting mechanism of iron-based superconductors (FeSCs) is still an open question. Generally, the hightemperature superconductivity is often observed with suppression of magnetic ordering, spin-density-wave, or even the structure transition by carrier doping. Furthermore, an electronic state ordering is also observed at temperatures close to or even above these transitions. Due to its proximity to the superconducting state and disappearance near the optimal superconductivity, it has been also suggested to interplay with superconductivity on a phenomenological level. Nevertheless, there is still no direct evidence to bridge the superconductivity to these transitions. Recently, another nematic order was observed in the superconducting state of heavily hole-doped compound AFe 2 As 2 (A = K, Rb, Cs), providing a possibility to explore the superconductivity gap symmetry nature. Here, by reviewing the recent experimental progresses on the nematic superconductivity in the FeSCs, we will introduce the progresses by various methods including the quasi-particle interference from scanning tunneling microscope, anisotropic gap magnitudes from angular resolved photoemission, the upper critical field and the superconducting transition temperatures from transport measurements. In addition, some recent reports and theoretical explanations for experimental results are followed.

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Novel electronic nematicity in heavily hole-doped iron pnictide superconductors

Cited by 46 publications

References 36 publications

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Hidden antiferronematic order in Fe-based superconductor BaFe2As2 and NaFeAs above TS

Progress of nematic superconductivity in iron-based superconductors

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