Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Ba</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>Fe</mml:mi><mml:mn>0.953</mml:mn></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mn>0.047</mml:mn></mml:msub><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Compound Using X-ray and Neut

Pratt, Dan E.; Wang, Tian; Kreyßig, A.; Zarestky, J.; Nandi, S.; Ni, N.; Bud’ko, Sergey L.; Canfield, Paul C.; Goldman, A. I.; McQueeney, R. J.

doi:10.1103/physrevlett.103.087001

Cited by 352 publications

(446 citation statements)

References 23 publications

Supporting

Mentioning

392

Contrasting

Unclassified

Order By: Relevance

“…The anti-correlation between the two dI/dV maps presents a direct visualization of the competition between the SDW and SC orders. The competition between magnetism and superconductivity has also been reported before by neutron and X-ray diffraction 7 , infrared spectroscopy 6 and mSR 8,9,18 studies on underdoped 122 compounds.…”

Section: Resultssupporting

confidence: 68%

“…5) and BaFe 2 À x Co x As 2 (ref. 8), together with nuclear magnetic resonance 6 and neutron scattering 7 on similar compounds, reveal the coexistence of the two phases. In an intermediate case, neutron scattering in CeFeAsO 1 À x F x reveals a continuous transition, but the SDW and SC regimes only touch at a quantum critical point 3 .…”

mentioning

confidence: 93%

“…A key question here is whether the magnetic order and superconductivity can coexist microscopically or mutually exclude each other. So far the available experimental methods used to answer this question are either spatially averaged probes or local ones without control of probing position, thus a consensus is still lacking [3][4][5][6][7][8][9] . Experiments on various iron pnictide compounds have revealed at least three categories of behaviour.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

et al. 2013

View full text Add to dashboard Cite

Although the origin of high temperature superconductivity in the iron pnictides is still under debate, it is widely believed that magnetic interactions or fluctuations have a crucial role in triggering Cooper pairing. A key issue regarding the iron pnictide phase diagram is whether long-range magnetic order can coexist with superconductivity microscopically. Here we use scanning tunnelling microscopy to investigate the local electronic structure of underdoped NaFe 1 À x Co x As near the spin density wave and superconducting phase boundary. Spatially resolved spectroscopy directly reveals both the spin density wave and superconducting gaps at the same atomic location, providing compelling evidence for the microscopic coexistence of the two phases. The strengths of the two orders are shown to anti-correlate with each other, indicating the competition between them. This work implies that Cooper pairing in the iron pnictides can occur when portions of the Fermi surface are already gapped by the spin density wave order.

show abstract

Section: Resultssupporting

confidence: 68%

mentioning

confidence: 93%

mentioning

confidence: 99%

See 1 more Smart Citation

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

et al. 2013

View full text Add to dashboard Cite

show abstract

“…We used these two features to determine T s and T N , respectively, in correlation to neutron and X-ray measurements. 15 Knowing these transition temperatures for each sample, we determined the actual x value from the temperature -doping (T − x) phase diagram of Fig. 3 (Ref.…”

Section: Resultsmentioning

confidence: 99%

Filamentary superconductivity across the phase diagram of Ba(Fe,Co)2As2

Xiao

et al. 2012

Phys. Rev. B

View full text Add to dashboard Cite

We show magnetotransport results on Ba(Fe1−xCox)2As2 (0.0 ≤ x ≤ 0.13) single crystals. We identify the low temperature resistance step at 23 K in the parent compound with the onset of filamentary superconductivity (FLSC), which is suppressed by an applied magnetic field in a similar manner to the suppression of bulk superconductivity (SC) in doped samples. FLSC is found to persist across the phase diagram until the long range antiferromagnetic order is completely suppressed. A significant suppression of FLSC occurs for 0.02 < x < 0.04, the doping concentration where bulk SC emerges. Based on these results and the recent report of an electronic anisotropy maximum for 0.02 ≤ x ≤ 0.04 [Science 329, 824 (2010)], we speculate that, besides spin fluctuations, orbital fluctuations may also play an important role in the emergence of SC in iron-based superconductors.

show abstract

“…Intriguingly, Ba 1−x K x Fe 2 As 2 , Ba(Fe 1−x Co x ) 2 As 2 and BaFe 2 (As 1−x P x ) 2 show a microscopically coexisting phase of AFM and SC orders, supported by neutron diffraction, 5,6 X-ray diffraction, 5, 7-9 and NMR 10, 11 experiments.…”

Section: Introductionmentioning

confidence: 88%

Coexistence of Antiferromagnetism and Superconductivity in Iron-Based Superconductors

2014

View full text Add to dashboard Cite

We theoretically investigate the coexistence of antiferromagnetism and superconductivity in the iron-based superconductors by using the mean-field theory for two-and three-orbital models. We find that both the s+−-wave and s++-wave superconductivity can coexist with antiferromagnetism in the two models. On Dirac Fermi surfaces emerging in the antiferromagnetic phase, a superconducting-gap function has a node for s++ wave but is nodeless for s+− wave. On the other hand, the gap function on non-Dirac Fermi surfaces is either nodeless or accidentally nodal, depending on the parameters of pairing interaction, which is independent of pairing symmetry. IntroductionUnderstanding the phase diagram of iron-based superconductors is a key to clarify the physics of superconductivity of these systems. Parent compounds of iron-based superconductors show an antiferromagnetic (AFM) spin density wave (SDW) below a Néel temperature. With hole or electron doping, magnetization is suppressed and superconductivity emerges. A close relationship of AFM and superconducting (SC) phases indicates that the formation of a Cooper pair is mediated by spin fluctuation, which leads to s +− -wave order 1, 2 where the sign of the gap function on hole Fermi surfaces (FSs) centered at the momentum k = (0, 0) is opposite to that on electron FSs at k=(π,0) and (0,π). On the other hand, it has been proposed that s ++ -wave order, where the two signs are the same, emerges when orbital fluctuation is responsible for superconductivity. 3, 4 s +− and s ++ are possible candidates of SC symmetry in iron-based superconductors.Since the AFM and SC phases are next to each other, the boundary of the two phases may provide useful information on superconductivity of iron-based superconductors. Intriguingly, Ba 1−x K x Fe 2 As 2 , Ba(Fe 1−x Co x ) 2 As 2 and BaFe 2 (As 1−x P x ) 2 show a microscopically coexisting phase of AFM and SC orders, supported by neutron diffraction, 5, 6 X-ray diffraction, 5, 7-9 and NMR 10, 11 experiments.Such a coexistence phase has theoretically been investigated, 12-17 where it is commonly assumed that FSs in a paramagnetic phase consists of a near-circular hole pocket centered at k = (0, 0) and an elliptical electron pocket at k=(π,0) and (0,π). The AFM order with wave vector Q=(π,0) mixes the hole and electron dispersions and a SDW gap is open. Resulting reconstructed FS is completely different from the FS of original paramagnetic phase. In the coexistence phase, it has been pointed out that the SC-gap function on the newly reconstructed

show abstract

Coexistence of Competing Antiferromagnetic and Superconducting Phases in the UnderdopedBa(Fe0.953Co0.047)2As2Compound Using X-ray and Neut

Cited by 352 publications

References 23 publications

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

Filamentary superconductivity across the phase diagram of Ba(Fe,Co)2As2

Coexistence of Antiferromagnetism and Superconductivity in Iron-Based Superconductors

Contact Info

Product

Resources

About