Pressure Induced Static Magnetic Order in Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>FeSe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>

Bendele, M.; Amato, A.; Conder, K.; Elender, Matthias; Keller, H.; Klauß, H.‐H.; Luetkens, H.; Pomjakushina, E.; Raselli, A.; Khasanov, R.

doi:10.1103/physrevlett.104.087003

Cited by 205 publications

(281 citation statements)

References 28 publications

(32 reference statements)

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“…We note the non-monotonous temperature dependence of the magnetic fraction for Ba 0.35 Rb 0.65 Fe 2 As 2 . V m increases below 75 K. This kind of T -dependence of V m was previously observed in a number of Fe-HTS's 63,64 with the static magnetism and may be caused by the interplay between magnetism and superconductivity.…”

Section: A Magnetization and Specific Heat Capacity Experimentsmentioning

confidence: 64%

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

et al. 2016

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Probing the pairing symmetry in the over-doped Fe- We report muon spin rotation experiments on the magnetic penetration depth λ and the temperature dependence of λ −2 in the over-doped Fe-based high-temperature superconductor (Fe-HTS) Ba1−xRbxFe2As2 (x = 0.65) studied at ambient and under hydrostatic pressures up to p = 2.3 GPa. We find that in this system λ −2 (T ) is best described by d-wave scenario. This is in contrast to the case of the optimally doped x = 0.35 system which is known to be a nodeless s +− -wave superconductor. This suggests that the doping induces the change of the pairing symmetry from s +− to d-wave in Ba1−xRbxFe2As2. In addition, we find that the d-wave order parameter is robust against pressure, suggesting that d is the common and dominant pairing symmetry in over-doped Ba1−xRbxFe2As2. Application of pressure of p = 2.3 GPa causes a decrease of λ(0) by less than 5 %, while at optimal doping x = 0.35 a significant decrease of λ(0) was reported. The superconducting transition temperature Tc as well as the gap to Tc ratio 2∆/kBTc show only a modest decrease with pressure. By combining the present data with those previously obtained for optimally doped system x = 0.35 and for the end member x = 1 we conclude that the SC gap symmetry as well as the pressure effects on the SC quantities strongly depend on the Rb doping level. These results are discussed in the light of the putative Lifshitz transition, i.e., a disappearance of the electron pockets in the Fermi surface of Ba1−xRbxFe2As2 upon hole doping.

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Section: A Magnetization and Specific Heat Capacity Experimentsmentioning

confidence: 64%

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

et al. 2016

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“…Polycrystalline samples of FeSe 1−x were investigated in early NMR measurements and muon-spin rotation (µSR) experiments. [34][35][36] According to these results, the spin fluctuation is enhanced at pressures up to ∼2.2 GPa 34) and a pressure-induced antiferromagnetic ordered state is stabilized above ∼1 GPa. 35,36) More recent studies on single crystals revealed the comprehensive and complex T -P phase diagram from macro-and microscopic measurements under high pressure.…”

Section: Introductionmentioning

confidence: 94%

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

et al. 2018

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The pressure dependence of the structural (Ts), antiferromagnetic (Tm), and superconducting (Tc) transition temperatures in FeSe is investigated on the basis of the 16-band d-p model. At ambient pressure, a shallow hole pocket disappears due to the correlation effect, as observed in the angular-resolved photoemission spectroscopy (ARPES) and quantum oscillation (QO) experiments, resulting in the suppression of the antiferromagnetic order, in contrast to the other iron pnictides. The orbital-polarization interaction between the Fe d orbital and Se p orbital is found to drive the ferro-orbital order responsible for the structural transition without accompanying the antiferromagnetic order. The pressure dependence of the Fermi surfaces is derived from the first-principles calculation and is found to well account for the opposite pressure dependences of Ts and Tm, around which the enhanced orbital and magnetic fluctuations cause the double-dome structure of the eigenvalue λ in the Eliashberg equation, as consistent with that of Tc in FeSe.

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“…This behavior is similar to that already observed earlier both by dc and ac magnetization. 8,12,13 In the region where T c decreases static magnetism develops in the sample and competes with superconductivity (see below and Ref. 8).…”

Section: Superconducting Propertiesmentioning

confidence: 99%

“…In fact, static magnetic ordering was observed above p ∼ 0.8 GPa by means of µSR. 8 The experiments revealed that as soon as magnetic ordering occurs, the magnetic and the superconducting states seem to compete with each other. This is because the incommensurate magnetic order gets suppressed when superconductivity sets in and, in addition, T c decreases in the pressure region 0.8 ≤ p ≤ 1.2 GPa.…”

Section: Introductionmentioning

confidence: 99%

“…Both the magnetic ordering temperature T N and T c increase simultaneously with increasing pressure, and the magnetic order becomes commensurate. 8 In this paper an extended study of the electronic and magnetic properties of FeSe 1−x under pressure investigated by means of ac susceptibility and µSR is presented. In addition, magnetic structures of FeSe 1−x under pressure are proposed and checked by neutron diffraction measurements.…”

Section: Introductionmentioning

confidence: 99%

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Coexistence of superconductivity and magnetism in FeSe1−xunder pressure

et al. 2012

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An extended investigation of the electronic phase diagram of FeSe1−x up to pressures of p 2.4 GPa by means of ac and dc magnetization, zero field muon spin rotation (ZF µSR), and neutron diffraction is presented. ZF µSR indicates that at pressures p ≥ 0.8 GPa static magnetic order occurs in FeSe1−x and occupies the full sample volume for p 1.2 GPa. ac magnetization measurements reveal that the superconducting volume fraction stays close to 100% up to the highest pressure investigated. In addition, above p ≥ 1.2 GPa both the superconducting transition temperature Tc and the magnetic ordering temperature TN increase simultaneously, and both superconductivity and magnetism are stabilized with increasing pressure. Calculations indicate only one possible muon stopping site in FeSe1−x, located on the line connecting the Se atoms along the c-direction. Different magnetic structures are proposed and checked by combining the muon stopping calculations with a symmetry analysis, leading to a similar structure as in the LaFeAsO family of Fe-based superconductors. Furthermore, it is shown that the magnetic moment is pressure dependent and with a rather small value of µ ≈ 0.2 µB at p 2.4 GPa.

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Pressure Induced Static Magnetic Order in SuperconductingFeSe1−x

Cited by 205 publications

References 28 publications

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

Coexistence of superconductivity and magnetism in FeSe1−xunder pressure

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