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Martinelli, A.; Palenzona, A.; Tropeano, M.; Ferdeghini, C.; Putti, M.; Cimberle, M. R.; Nguyen, Tung Lam; Affronte, Marco; Ritter, C.

doi:10.1103/physrevb.81.094115

Cited by 137 publications

(226 citation statements)

References 23 publications

(56 reference statements)

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“…Due to the fact that the studied here subtle FS changes are closely related to geometry of the u.c. of this compound, the experimental lattice parameter c [31] …”

Section: Resultsmentioning

confidence: 99%

Strain effects on electronic structure and superconductivity in the iron telluride

2014

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The influence of tensile strain in the ab-plane on crystal and electronic structure of FeTe has been studied ab initio. In superconducting FeSe the Fermi surface nesting with a vector q ∼ (0.5, 0.5) × (2π/a) is believed to be crucial for rising superconductivity mediated by spin-fluctuations. The results presented here indicate that tensile-strained FeTe also exhibits such conditions. Furthermore, the Fermi surface changes, related to the increase of the lattice parameter a of this telluride, are opposite to analogous effects reported for FeSe. Since a recently reported transition from the double-stripe to the single-stripe magnetic order in FeTe under tensile strain in the ab-plane is associated with an occurrence of superconductivity in corresponding thin films, these findings allow for drawing a consistent picture of superconductivity in FeSe 1−x Te x systems, in general.

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“…Due to the fact that the studied here subtle FS changes are closely related to geometry of the u.c. of this compound, the experimental lattice parameter c [31] …”

Section: Resultsmentioning

confidence: 99%

Strain effects on electronic structure and superconductivity in the iron telluride

2014

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“…11,25,28 For y < y c ≈ 0.1, the structure is monoclinic, with two different Fe-Fe in-plane bond lengths that match up with the alternating antiferromagnetic and ferromagnetic bonds of the collinear magnetic structure. 11,18,41 For y > y c , the structure is orthorhombic, with a single Fe-Fe bond length; the corresponding magnetic structure is found to be helical. 11, 25 Mizuguchi et al 28 have recently demonstrated with high-resolution x-ray diffraction that the boundary between the orthorhombic and monoclinic phases can also be crossed as a function of temperature for y y c .…”

Section: A Tuning Of the Magnetic Ordermentioning

confidence: 99%

“…The excess Fe resides in an interstitial site centered above (or below) a plaquette of four Fe sites. 18,19 The magnetic interaction between an interstitial and the Fe nearest-neighbors results in locally ferromagnetic correlations 20,21 and weak localization of the charge carriers, 22 and acts as a magnetic electron donor. 22 The excess Fe concentration is anticorrelated with the superconducting volume fraction and results in short-range magnetic order.…”

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confidence: 99%

Magnetic order tuned by Cu substitution in Fe1.1−zCuzTe

Wen

et al. 2012

Phys. Rev. B

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We study the effects of Cu substitution in Fe1.1Te, the non-superconducting parent compound of the iron-based superconductor, Fe1+yTe1−xSex, utilizing neutron scattering techniques. It is found that the structural and magnetic transitions, which occur at ∼ 60 K without Cu, are monotonically depressed with increasing Cu content. By 10% Cu for Fe, the structural transition is hardly detectable, and the system becomes a spin glass below 22 K, with a slightly incommensurate ordering wave vector of (0.5-δ, 0, 0.5) with δ being the incommensurability of 0.02, and correlation length of 12Å along the a axis and 9Å along the c axis. With 4% Cu, both transition temperatures are at 41 K, though short-range incommensurate order at (0.42, 0, 0.5) is present at 60 K. With further cooling, the incommensurability decreases linearly with temperature down to 37 K, below which there is a first order transition to a long-range almost-commensurate antiferromagnetic structure. A spin anisotropy gap of 4.5 meV is also observed in this compound. Our results show that the weakly magnetic Cu has large effects on the magnetic correlations; it is suggested that this is caused by the frustration of the exchange interactions between the coupled Fe spins.

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“…It is clear that the RQP regime is not developed as for samples S02 to S07, but it may produce an additional conduction that impedes to describe the temperature dependence of its resistivity with a simple expression. (FTSe) [16,33,34,17], FeTe 1−x S x (FTS) [35] and FTSeS (our work). The data point of the S01 sample is indicated with an arrow.…”

Section: Resultsmentioning

confidence: 99%