Charge ordering in stoichiometric FeTe: Scanning tunneling microscopy and spectroscopy

Li, Wei; Yin, Wei‐Guo; Wang, Lili; He, Ke; Ma, Xu-Cun; Xue, Qi Kun; Chen, Xi

doi:10.1103/physrevb.93.041101

Cited by 24 publications

(41 citation statements)

References 41 publications

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“…There are three possible sources for considerable V : (i) Strongly correlated metals are generally bad metals with large resistivity of the order of mΩ·cm and small optical Drude peak. Therefore, the electrostatic screening does not work well in those systems [14,[75][76][77][78]. (ii) In mean-field theory, the local constraint of no-double occupancy at each site is reinforced only globally.…”

Section: Discussionmentioning

confidence: 99%

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Phase competition and anomalous thermal evolution in high-temperature superconductors

Zhou

Yin

et al. 2017

Phys. Rev. B

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The interplay of competing orders is relevant to high-temperature superconductivity known to emerge upon suppression of a parent antiferromagnetic order typically via charge doping. How such interplay evolves at low temperature-in particular at what doping level the zero-temperature quantum critical point (QCP) is located-is still elusive because it is masked by the superconducting state. The QCP had long been believed to follow a smooth extrapolation of the characteristic temperature T * for the strange normal state well above the superconducting transition temperature. However, recently the T * within the superconducting dome was reported to unexpectedly exhibit back-bending likely in the cuprate Bi2Sr2CaCu2O 8+δ . Here we show that the original and revised phase diagrams can be understood in terms of weak and moderate competitions, respectively, between superconductivity and a pseudogap state such as d-density-wave or spin-density-wave, based on both Ginzburg-Landau theory and the realistic t-t ′ -t ′′ -J-V model for the cuprates. We further found that the calculated temperature and doping-level dependence of the quasiparticle spectral gap and Raman response qualitatively agrees with the experiments. In particular, the T * back-bending can provide a simple explanation of the observed anomalous two-step thermal evolution dominated by the superconducting gap and the pseudogap, respectively. Our results imply that the revised phase diagram is likely to take place in high-temperature superconductors.

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Section: Discussionmentioning

confidence: 99%

“…Like in the cuprates, V may promote charge instabilities in the ironbased superconductors [78] in competition with SC. We notice that similar anomalous temperature dependence of ERS in the B 2g channel was discovered in slightly underdoped Ba-122 iron-based superconductor [59] [open circles in Fig.…”

Section: Discussionmentioning

confidence: 99%

Phase competition and anomalous thermal evolution in high-temperature superconductors

Zhou

Yin

et al. 2017

Phys. Rev. B

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“…On one hand, the interpretation for the 2 a Te superstructure is given in terms of a charge density wave (CDW), where the charge density of the top Te layer is modified by the SDW of the underlying AFM order of the Fe layer. The strong dependence on the bias voltage V bias suggests a complex interplay between the charge and the magnetic order18202730. In contrast to a common representation of spin and charge modulations in correlated electron systems31, in this case the CDW would have the same periodicity as the SDW.…”

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confidence: 99%

“…STM data obtained for Fe 1+ y Te bulk and thin film samples have revealed atomic resolution of the Te-terminated surface and a superstructure on top of the atomic corrugation having a periodicity of λ =2 a Te 181920272829. The observation of this additional λ =2 a Te periodicity is mainly discussed in two contradictory models.…”

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confidence: 99%

“…It provides a non-polar charge-neutral Te-terminated surface on cleaving161718. Furthermore Fe 1+ y Te can be grown in situ by molecular beam epitaxy with high quality1920. In bulk, Fe 1+ y Te is the non-superconducting parent compound of the transition metal chalcogenide system Fe 1+ y Se 1− x Te x 10 and exhibits the DDS magnetic structure below its Néel-temperature T N 212223.…”

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Reorientation of the diagonal double-stripe spin structure at Fe1+yTe bulk and thin-film surfaces

Hänke¹,

Singh²,

Cornils³

et al. 2017

Nat Commun

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Establishing the relation between ubiquitous antiferromagnetism in the parent compounds of unconventional superconductors and their superconducting phase is important for understanding the complex physics in these materials. Going from bulk systems to thin films additionally affects their phase diagram. For Fe1+yTe, the parent compound of Fe1+ySe1−xTex superconductors, bulk-sensitive neutron diffraction revealed an in-plane oriented diagonal double-stripe antiferromagnetic spin structure. Here we show by spin-resolved scanning tunnelling microscopy that the spin direction at the surfaces of bulk Fe1+yTe and thin films grown on the topological insulator Bi2Te3 is canted out of the high-symmetry directions of the surface unit cell resulting in a perpendicular spin component, keeping the diagonal double-stripe order. As the magnetism of the Fe d-orbitals is intertwined with the superconducting pairing in Fe-based materials, our results imply that the superconducting properties at the surface of the related superconducting compounds might be different from the bulk.

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Thin Film Growth of Fe-Based Superconductors

Haindl

2021

Iron-Based Superconducting Thin Films

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Charge ordering in stoichiometric FeTe: Scanning tunneling microscopy and spectroscopy

Cited by 24 publications

References 41 publications

Phase competition and anomalous thermal evolution in high-temperature superconductors

Phase competition and anomalous thermal evolution in high-temperature superconductors

Reorientation of the diagonal double-stripe spin structure at Fe1+yTe bulk and thin-film surfaces

Thin Film Growth of Fe-Based Superconductors

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