Tunable (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>δ</mml:mi><mml:mi>π</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>δ</mml:mi><mml:mi>π</mml:mi></mml:math>)-Type Antiferromagnetic Order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Fe(Te,Se) Superconductors

Bao, Wan-Su; Qiu, Yiming; Huang, Q.; Green, Mark; Zajdel, P.; Fitzsimmons, M. R.; Zhernenkov, Mikhail; Chang, S.; Fang, Minghu; Qian, Bin; Vehstedt, E. K.; Yang, Jingsong; Pham, Huy; Spînu, Leonard; Mao, Zhiqiang

doi:10.1103/physrevlett.102.247001

Cited by 678 publications

(865 citation statements)

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“…The M (T ), R(T ) and χ(T ) dependences all show well expressed anomalous peaks in the temperature range 120-150 K, similar to those observed in FeSe [5,7], but in our case the temperature T s corresponding to this anomaly is about 50 K higher. Such singularities are usually caused by structural transitions or transitions in magnetic subsystem [5].…”

Section: Magnetic Propertiesmentioning

confidence: 52%

“…By comparing the experimental M (H) dependence to the critical state model we can estimate that the contribution of ferromagnetic regions amounts to about 10% of the total sample magnetization. It has been suggested [5] that this contribution is caused by actual composition of the investigated compound being Fe 1+δ (Se 1+x Te x ), where δ denotes excess Fe ions, which occupy partially the interstitial sites, and form planes parallel to the base FeSeTe planes. However, it is more probable that it comes from the inclusions of ferrimagnetic [6] Fe 7 Se 8 , which has also planar structure.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…Such singularities are usually caused by structural transitions or transitions in magnetic subsystem [5].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

et al. 2010

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We report on measurements of samples with nominal composition FeSe 0.5 Te 0.5 , crystallized by the Bridgman method. Magnetic and transport properties of the samples were examined. The measurements confirm the coexistence of ferromagnetism and superconductivity below the superconducting transition temperature. The ferromagnetic contribution to magnetization, estimated at 10%, might be caused by the presence of ferrimagnetic Fe7Se8, which occupies about 10% of sample volume. From the Andreev spectroscopy we found superconducting energy gap ∆ = 2.6 meV at T = 4.2 K, and from magnetization measurements the critical temperature Tc = 15.8 K.The critical current density in magnetic field H = 4 kOe, determined from magnetization measurements, is jc = (1-2) × 10 4 A/cm 2 and weakly depends on magnetic field intensity.

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Section: Magnetic Propertiesmentioning

confidence: 52%

Section: Magnetic Propertiesmentioning

confidence: 99%

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Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

et al. 2010

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“…The magnetic moment on the interstitial atom in Fe 1.06 S acquires the largest magnetic moment of 2.36 μ B , similar to that for the FeTe system. 44 For example, the interstitial Fe sites in Fe 1.125 Te have a larger moment (2.4 μ B /Fe) than the Fe atoms of the square net (1.6−1.8 μ B /Fe), as calculated using VASP. 45 Neutron powder diffraction on Fe 1.068 Te confirms the magnetic moment of 2.25(8) μ B /Fe, while revealing a double-striped magnetic ordering.…”

Section: Magnetic Orderingmentioning

confidence: 99%

Validation of Interstitial Iron and Consequences of Nonstoichiometry in Mackinawite (Fe_1+xS)

Brgoch

Miller

2012

J. Phys. Chem. A

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A theoretical investigation of the relationship between chemical composition and electronic structure was performed on the nonstoichiometric iron sulfide, mackinawite (Fe 1+x S), which is isostructural and isoelectronic with the superconducting Fe 1+x Se and Fe 1+x (Te 1-y Se y ) phases. Even though Fe 1+x S has not been measured for superconductivity, the effects of stoichiometry on transport properties and electronic structure in all of these iron-excess chalcogenide compounds has been largely overlooked. In mackinawite, the amount of Fe that has been reported ranges from a large excess, Fe 1.15 S, to nearly stoichiometric, Fe 1.00 (7) S. Here, we analyze, for the first time, the electronic structure of Fe 1+x S to justify these nonstoichiometric phases. First principles electronic structure calculations using supercells of Fe 1+x S yield a wide range of energetically favorable compositions (0 < x < 0.30). The incorporation of interstitial Fe atoms originates from a delicate balance between the Madelung energy and the occupation of Fe-S and Fe-Fe antibonding orbitals. A theoretical assessment of various magnetic structures for "FeS" and Fe 1.06 S indicate that striped magnetic ordering along [110] is the lowest energy structure and the interstitial Fe affects the values of moments in the square planes as a function of distance. Moreover, the formation of the magnetic moment is dependent on the unit cell volume, thus relating it to composition. Finally, changes in the composition cause a modification of the Fermi surface and ultimately the loss of a nested vector. ABSTRACT: A theoretical investigation of the relationship between chemical composition and electronic structure was performed on the nonstoichiometric iron sulfide, mackinawite (Fe 1+x S), which is isostructural and isoelectronic with the superconducting Fe 1+x Se and Fe 1+x (Te 1−y Se y ) phases. Even though Fe 1+x S has not been measured for superconductivity, the effects of stoichiometry on transport properties and electronic structure in all of these iron-excess chalcogenide compounds has been largely overlooked. In mackinawite, the amount of Fe that has been reported ranges from a large excess, Fe 1.15 S, to nearly stoichiometric, Fe 1.00 (7) S. Here, we analyze, for the first time, the electronic structure of Fe 1+x S to justify these nonstoichiometric phases. First principles electronic structure calculations using supercells of Fe 1+x S yield a wide range of energetically favorable compositions (0 < x < 0.30). The incorporation of interstitial Fe atoms originates from a delicate balance between the Madelung energy and the occupation of Fe−S and Fe−Fe antibonding orbitals. A theoretical assessment of various magnetic structures for "FeS" and Fe 1.06 S indicate that striped magnetic ordering along [110] is the lowest energy structure and the interstitial Fe affects the values of moments in the square planes as a function of distance. Moreover, the formation of the magnetic moment is dependent on the unit cell volume, thus relating it to...

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“…In addition, the 11 type is less toxic than iron pnictides and has small anisotropy [6], which is favorable for applications with high current-carrying capabilities. However, the excess iron that is located at the interstitial site in the Te/Se layer [7] has strong magnetism and acts as pair a breaker and suppresses superconductivity [8,9]. Thus, the as-grown Fe 1+y Te 1-x Se x single crystals only show filamentary superconductivity [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Iodine Annealing on Fe₁₊_yTe_0.6Se_0.4

et al. 2016

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Effects of iodine annealing to induce bulk superconductivity in Fe 1+y Te 0.6 Se 0.4 have been systematically studied by changing the molar ratio of iodine to the sample and annealing temperature. The optimal condition to induce bulk superconductivity with T c ~14.5 K and self-field J c (2 K) ~ 5×10 5 A/cm 2 is found to be a molar ratio of iodine of 5-7 % at the annealing temperature of 400 °C. Furthermore, the fact that no compounds containing iodine are detected in the crystal and a significant amount of FeTe 2 is produced after the iodine annealing strongly indicate that the excess iron is consumed to form FeTe 2 and iodine works as a catalyst in this process.

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Tunable (δπ,δπ)-Type Antiferromagnetic Order inα-Fe(Te,Se) Superconductors

Cited by 678 publications

References 37 publications

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Validation of Interstitial Iron and Consequences of Nonstoichiometry in Mackinawite (Fe_1+xS)

Effects of Iodine Annealing on Fe₁₊_yTe_0.6Se_0.4

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Tunable (δπ,δπ)-Type Antiferromagnetic Order inα-Fe(Te,Se) Superconductors

Cited by 678 publications

References 37 publications

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Validation of Interstitial Iron and Consequences of Nonstoichiometry in Mackinawite (Fe1+xS)

Effects of Iodine Annealing on Fe1+yTe0.6Se0.4

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Product

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Validation of Interstitial Iron and Consequences of Nonstoichiometry in Mackinawite (Fe_1+xS)

Effects of Iodine Annealing on Fe₁₊_yTe_0.6Se_0.4