Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Chu, Hui; Li, Jie; Shao, Li; Wang, Ning; Wang, Jia; Gao, Yanli; Deng, Hui; Sun, XiaoSong; Zheng, Dongning

doi:10.1007/s11433-010-4049-3

Cited by 7 publications

(7 citation statements)

References 46 publications

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“…A magnetic characterization of the crystals in the normal state shows no evidence of a magnetic feature at this temperature. In the literature there are similar magnetoresistance results in films [9] and policrystals [10].…”

Section: Resultssupporting

confidence: 69%

Multiband character ofβ-FeSe: Angular dependence of the magnetoresistance and upper critical field

Amigó

Crivillero

Franco

et al. 2014

J. Phys.: Conf. Ser.

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We studied ab-plane transport properties in single crystals of the superconductor β-FeSe up to 16 T. In the normal state, below 90 K, the crystals present a strongly anisotropic positive magnetoresistance that becomes negligible above that temperature. In the superconducting state (Tc=8.87(5) K) the upper critical field anisotropy Hc2 ab/ Hc2 c changes with temperature and the angular dependence of the dissipation for fixed temperatures and fields reflects a strongly anisotropic behavior. Our results make evident that multiband effects are needed to describe the measured transport properties. We model the magnetoresistance and upper critical field behavior with a two-band model showing that the diffusivities ratio parameter remains unchanged going from the normal to the superconducting state.

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Section: Resultssupporting

confidence: 69%

Multiband character ofβ-FeSe: Angular dependence of the magnetoresistance and upper critical field

Amigó

Crivillero

Franco

et al. 2014

J. Phys.: Conf. Ser.

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“…No measurable magnetoresistance, in the same temperature range, was observed in crystal A as reported in other crystals with phase coexistence [11]. However, a behavior similar to that of crystal B has been reported in films [12] and polycrystals [13]. For sample B, magnetic field parallel or perpendicular to the crystal surface, implies magnetic field aligned to the ab-plane or to the c axis, respectively.…”

Section: Crystal Characterizationsupporting

confidence: 66%

Influence of the Fe Concentration on the Superconducting Properties of Fe $$_{1-y}$$ 1 - y Se

et al. 2014

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We present a comparative study of electrical transport properties in the normal state and in the dissipative superconducting state between pure β-FeSe phase and Fe deficient Fe 1−y Se crystals. We discuss the influence of the intergrowth of the magnetic hexagonal phase (Fe 7 Se 8 ) in Fe deficient samples when compared to pure β-FeSe samples. In the superconducting state, we measured the ab-plane electrical resistivity with magnetic field up to 16 T and the electrical resistivity as a function of the angle between the c axis and the applied field. The angular dependence at fixed temperature below the superconducting critical temperature, T c (H = 0), is very different for both sets of crystals. The Fe deficient samples display a vortex pinningrelated feature at ∼57 • off the plane while the pure β-FeSe phase samples show the persistence of a strong angular-dependent magnetoresistance characteristic of the normal state electronic structure.

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“…4 приведены зависимости R(H)/R(0) для систем с оловом и свинцом, измеренные при 16 K в поле 14 Т. Сопротивление образца со свинцом вырастает при этой температуре на 37%. Это значение больше, чем магнетосопротивление 28% (при близких условиях 10.5 K и 12 Т) для системы Fe 1.11 Se 0.95 Sb 0.05 , считавшегося ранее рекордным для халькогенидных железосодержащих сверхпроводников [21].…”

Section: замещение на олово и свинецunclassified

“…Второе -при введении этих элементов может происходить уменьшение количества атомов железа в междоузельных позициях β-фазы. Влияние междоузельного железа на сверхпроводящие свойства β-фазы широко обсуждалось в литературе [27,28] и было использовано для анализа результатов по замещению железа сурьмой в соединении Fe−Se [21].…”

Section: заключениеunclassified

“…В ряде работ исследовалось замещение на сурьму, причем как железа, так и атомов халькогена и было обнаружено, что, несмотря на образование и выделение включений FeSb, сверхпроводящие свойства матрицы не ухудшаются, а нормальное состояние материала имеет меньшее сопротивление и заметное магнитосопротивление [20,21].…”

Section: Introductionunclassified

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Влияние частичного замещения железа на элементы IV группы на структуру и сверхпроводящие свойства соединения Fe(Se-=SUB=-0.2-=/SUB=-Te-=SUB=-0.8-=/SUB=-)-=SUB=-0.82-=/SUB=-

Русаков¹,

Волков²

2023

Журнал Технической Физики

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The structure and superconducting properties of the Fe1 – x(A)x(Se0.2Te0.8)0.82 (x = 0.1, 0.2) compound, where A is Cu, Zn, Bi or Group IV elements (Pb, Sn, Ge), were studied. It was shown that the effect of substitution of some iron atoms on the structure and superconducting properties of the Fe(Se,Te) compound depends on whether a solid solution with a substituting element was formed. If complete dissolution of the replacement element occured (Cu, Zn), then a significant degradation of the superconducting properties was observed. If a separate chalcogenide phase was formed (substitution by Pb, Sn, Ge), then a slight change in the superconducting properties was observed. Such a slight change and even improvement in the superconducting properties upon precipitation of the chalcogenide phase can be associated with both the positive effect of an increase in the relative content of iron and a decrease in the number of iron atoms in the interstitial sites of the β phase. The preservation of the superconducting properties of the Fe(Se,Te) compound with a small substitution of iron for group IV elements can be used to create wires based on Fe(Se,Te), since impurity chalcogenide particles can act as effective pinning centers.

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Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

Cited by 7 publications

References 46 publications

Multiband character ofβ-FeSe: Angular dependence of the magnetoresistance and upper critical field

Multiband character ofβ-FeSe: Angular dependence of the magnetoresistance and upper critical field

Influence of the Fe Concentration on the Superconducting Properties of Fe $$_{1-y}$$ 1 - y Se

Влияние частичного замещения железа на элементы IV группы на структуру и сверхпроводящие свойства соединения Fe(Se-=SUB=-0.2-=/SUB=-Te-=SUB=-0.8-=/SUB=-)-=SUB=-0.82-=/SUB=-

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