Nematic superconducting state in iron pnictide superconductors

Li, Jun; Pereira, Paulo J.; Yuan, Jie; Lv, Yang‐Yang; Jiang, Meiping; Lu, Da-Chuan; Lin, Ziquan; Liu, Yongjie; Wang, Junfeng; Li, Liang; Ke, Xiaoxing; Tendeloo, Gustaaf Van; Li, Mengyue; Feng, Hai-Luke; Hatano, Takeshi; Wang, Huabing; Wu, Peiheng; Yamaura, Kazunari; Takayama‐Muromachi, E.; Vanacken, Johan; Chibotaru, Liviu F.; Moshchalkov, Victor

doi:10.1038/s41467-017-02016-y

Cited by 38 publications

(32 citation statements)

References 36 publications

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“…An insight favoring this last possibility is the subtle loss of the C 2 symmetry observed at the onset of the resistive transition for some strain conditions. Careful observation of the color maps in the polar plots in Figure 6, shows that there is a weak loss of C2 symmetry, similar to that recently observed in in-plane angular dependence resistivity and associated with the multiband character 15 . This measured effect (within the circular segments delimited by red lines) is more evident at higher temperatures, i.e.…”

Section: Resultssupporting

confidence: 79%

“…Recently, a nematic superconducting phase in an optimally doped tetragonal compound of the family Ba 1−x K x Fe 2 As 2 15 was reported. The strong symmetry breaking in the superconducting transport properties, in contrast to the very weak symmetry breaking in the normal phase may originate from the strong quantum fluctuations of a nearby nematic quantum critical point, as found in recent state-of-the-art quantum Monte Carlo simulations.…”

Section: Introductionmentioning

confidence: 99%

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Nematicity in the superconducting mixed state of strain detwinned underdoped Ba( Fe1−xCox)2As2

et al. 2019

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Evidence of nematic effects in the mixed superconducting phase of slightly underdoped Ba(Fe1−xCox)2As2 is reported. We have found strong in-plane resistivity anisotropy for crystals in different strain conditions. For these compositions, there is no magnetic long range order, so the description may be ascribed to the interplay between the superconducting and nematic order parameters. A piezoelectric-based apparatus is used to apply tensile or compressive strain to tune nematic domain orientation in order to examine intrinsic nematicity. Measurements are done under a rotating magnetic field and the analysis of the angular dependence of physical quantities identifies the cases in which the sample is detwinned. Furthermore, the angular dependence of the data allows us to evaluate the effects of nematicity on the in-plane superconductor stiffness. Our results show that although nematicity contributes in a decisive way in the conduction properties, its contributions to the anisotropy properties of the stiffness of the superconducting order parameter is not as significant in these samples.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Nematicity in the superconducting mixed state of strain detwinned underdoped Ba( Fe1−xCox)2As2

et al. 2019

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“…The nematic superconducting state in this superconductor is induced by the small symmetry breaking term in the normal phase which qualitatively differs from the ordinary nematicity observed in the orthorhombic structural phase. The superconducting state nematicity occurs just after the onset of superconducting transition and reveals an anisotropy shifted by π/4 from those of the normal nematic state 34 . Meanwhile, the superconducting transition temperature resembles a low energy scale, hereby, the lower nematic transition temperature may correspond to an infrared phenomenon of the strongly interacting fermion system.…”

Section: Comparison With Other Systemsmentioning

confidence: 99%

“…In some iron-based superconductors, the superconducting nematic transition temperature was also found below the superconducting transition temperature, such as p-type 122-system iron pnictide superconductors 34 . The nematic superconducting state in this superconductor is induced by the small symmetry breaking term in the normal phase which qualitatively differs from the ordinary nematicity observed in the orthorhombic structural phase.…”

Section: Comparison With Other Systemsmentioning

confidence: 99%

Elliptical vortex and oblique vortex lattice in the FeSe superconductor based on the nematicity and mixed superconducting orders

et al. 2018

npj Quant Mater

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The electronic nematic phase is characterized as an ordered state of matter with rotational symmetry breaking, and has been well studied in the quantum Hall system and the high-Tc superconductors, regardless of cuprate or pnictide family. The nematic state in high-Tc systems often relates to the structural transition or electronic instability in the normal phase. Nevertheless, the electronic states below the superconducting transition temperature is still an open question. With high-resolution scanning tunneling microscope measurements, direct observation of vortex core in FeSe thin films revealed the nematic superconducting state by Song et al. Here, motivated by the experiment, we construct the extended Ginzburg-Landau free energy to describe the elliptical vortex, where a mixed s-wave and d -wave superconducting order is coupled to the nematic order. The nematic order induces the mixture of two superconducting orders and enhances the anisotropic interaction between the two superconducting orders, resulting in a symmetry breaking from C4 to C2. Consequently, the vortex cores are stretched into an elliptical shape. In the equilibrium state, the elliptical vortices assemble a lozenge-like vortex lattice, being well consistent with experimental results. arXiv:1709.04786v3 [cond-mat.supr-con]

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“…However, such results still have not been reported from experiments. In addition, the magnetoresistivity of Ba 0:5 K 0:5 Fe 2 As 2 reported a nematic superconducting state recently and suggested that the holedoped superconductor is the mixture of s-wave and d-wave superconducting orders [63]. These results provide a different path to further researches to understand the mechanism of the nematic state in the superconductivity.…”

Section: Phase Diagrammentioning

confidence: 99%

Nematicity in Electron-Doped Iron-Pnictide Superconductors

Chen¹

2020

On the Properties of Novel Superconductors

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The nature of the nematicity in iron pnictides is studied with a proposed magnetic fluctuation. The spin-driven order in the iron-based superconductor has been realized in two categories: stripe SDW state and nematic state. The stripe SDW order opens a gap in the band structure and causes a deformed Fermi surface. The nematic order does not make any gap in the band structure and still deforms the Fermi surface. The electronic mechanism of nematicity is discussed in an effective model by solving the self-consistent Bogoliubov-de Gennes equations. The nematic order can be visualized as crisscross horizontal and vertical stripes. Both stripes have the same period with different magnitudes. The appearance of the orthorhombic magnetic fluctuations generates two uneven pairs of peaks at AEπ; 0 ðÞ and 0; AEπ ðÞ in its Fourier transformation. In addition, the nematic order breaks the degeneracy of d xz and d yz orbitals and causes the elliptic Fermi surface near the Γ point. The spatial image of the local density of states reveals a d x2-y2-symmetry form factor density wave.

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Nematic superconducting state in iron pnictide superconductors

Cited by 38 publications

References 36 publications

Nematicity in the superconducting mixed state of strain detwinned underdoped Ba( Fe1−xCox)2As2

Nematicity in the superconducting mixed state of strain detwinned underdoped Ba( Fe1−xCox)2As2

Elliptical vortex and oblique vortex lattice in the FeSe superconductor based on the nematicity and mixed superconducting orders

Nematicity in Electron-Doped Iron-Pnictide Superconductors

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