Pressure-induced ferromagnetism in antiferromagnetic Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1.03</mml:mn></mml:mrow></mml:msub></mml:math>Te

Bendele, M.; Maisuradze, A.; Roessli, B.; Gvasaliya, S. N.; Pomjakushina, E.; Weyeneth, S.; Conder, K.; Keller, H.; Khasanov, R.

doi:10.1103/physrevb.87.060409

Cited by 31 publications

(53 citation statements)

References 34 publications

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“…This is in reasonable agreement with results of Ref. [40], where the ferromagnetic state was observed in FeTe for the first time under pressures of P ≥ 20 kbar.…”

Section: Discussionsupporting

confidence: 82%

“…As appears from the present calculations of the pressure effect on χ for FeSe 0.5 Te 0.5 and the earlier similar calculations for FeSe and FeTe, the large positive pressure effect on susceptibility in FeSe 1−x Te x compounds is determined by the dominating positive contribution caused by the strong sensitivity of paramagnetic susceptibility to internal structural parameter Z and its change under pressure. It should be noted that the largest pressure effect on χ appears in FeTe compound, and that is a source of the observed its ferromagnetic state at high pressures [40].…”

Section: Discussionmentioning

confidence: 99%

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Interrelation of superconductivity and magnetism in FeSe1−xTex compounds. Pressure effects

Панфилов¹,

Pashchenko²,

Grechnev³

et al. 2014

Low Temperature Physics

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The effect of isotropic pressures P up to 5 kbar on the superconducting transition temperature Tc of the FeSe1−xTex system (x = 0, 0.85, 0.88, 0.90) is studied. For the first time, a change in the sign of the effect of pressure on Tc on going from FeSe to the tellurium-rich alloys is observed. This makes it possible to specify more precisely the form of the dependence of the pressure derivative dTc/dP on composition in this system. This dependence is compared with first principles calculations of the electron structure and magnetism of FeSe, FeTe, and FeSe0.5Te0.5 as functions of pressure, as well as with our earlier experimental data on the effect of pressure on the magnetic susceptibility of the normal state in FeSe and FeTe. This comparison is indicative of a competitive interrelationship between superconductivity and magnetism in tellurium rich FeSe1−xTex compounds.

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“…This is in reasonable agreement with results of Ref. [40], where the ferromagnetic state was observed in FeTe for the first time under pressures of P ≥ 20 kbar.…”

Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Interrelation of superconductivity and magnetism in FeSe1−xTex compounds. Pressure effects

Панфилов¹,

Pashchenko²,

Grechnev³

et al. 2014

Low Temperature Physics

View full text Add to dashboard Cite

show abstract

“…Ferromagnetic order is much less usual than antiferromagnetism in Fe superconductors but it has been observed in a few cases [15-19, 23, 24, 269, 270]. [(Li 1−x Fe x )OH]FeSe based [15][16][17][18][19] [23,24]. This variety of magnetic patterns indicates the magnetic order in these systems is soft, namely, it can be affected by small changes in parameters.…”

Section: Magnetic Softnessmentioning

confidence: 99%

Magnetic interactions in iron superconductors: A review

Bascones

Valenzuela

Calderón

2015

Comptes Rendus. Physique

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High temperature superconductivity in iron pnictides and chalcogenides emerges when a magnetic phase is suppressed. The multi-orbital character and the strength of correlations underlie this complex phenomenology, involving magnetic softness and anisotropies, with Hund's coupling playing an important role. We review here the different theoretical approaches used to describe the magnetic interactions in these systems. We show that taking into account the orbital degree of freedom allows us to unify in a single phase diagram the main mechanisms proposed to explain the (π, 0) order in iron pnictides: the nesting-driven, the exchange between localized spins, and the Hund induced magnetic state with orbital differentiation. Comparison of theoretical estimates and experimental results helps locate the Fe superconductors in the phase diagram. In addition, orbital physics is crucial to address the magnetic softness, the doping dependent properties, and the anisotropies.

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“…The measured magnetic moment of Fe in Fe 1+x Te is about 2.25 B µ [103], larger than those of Fe-As compounds. Recently it is found that Fe 1.03 Te becomes ferromagnetic with application of pressure and the magnetic moment per Fe atom reaches about 3 B µ at the highest pressure investigated [105]. Fe 1+x Se is nonmagnetic and shows tetragonal to orthorhombic structure transition at 90 K [106].…”

Section: Structurementioning

confidence: 99%

Antiferromagnetism and its origin in iron-based superconductors (Review Article)

Ding

Lin

Zhang

2014

Low Temperature Physics

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In iron-based superconductors, unravelling the origin of the antiferromagnetism is a crucial step towards understanding the high-T c superconductivity as it is widely believed that the magnetic fluctuations play important roles in the formation of the Cooper pairs. Therefore, in this paper, we will briefly review experimental results related to the antiferromagnetic state in iron-based superconductors and focus on a review of the theoretical investigations which show applicability of the itinerant scenario to the observed antiferromagnetism and corresponding phase transitions in various families of the iron-based superconductors. A proposal of coupling between frustrated and unfrustrated bands for understanding the reduced magnetic moment typically observed in iron pnictides is also reviewed. While all the above theoretical investigations do not rule out a possible existence of localized electrons in iron-based superconductors, these results strongly indicate a close relation between itinerant electrons and the magnetically ordered state and point out the importance of taking into account the orbital degrees of freedom.

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Pressure-induced ferromagnetism in antiferromagnetic Fe1.03Te

Cited by 31 publications

References 34 publications

Interrelation of superconductivity and magnetism in FeSe1−xTex compounds. Pressure effects

Interrelation of superconductivity and magnetism in FeSe1−xTex compounds. Pressure effects

Magnetic interactions in iron superconductors: A review

Antiferromagnetism and its origin in iron-based superconductors (Review Article)

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