The paramagnetic properties of iron selenides with NiAs-type structure

Terzieff, P.; Komarek, K. L.

doi:10.1007/bf00912781

Cited by 30 publications

(24 citation statements)

References 19 publications

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“…The crystal lattice of β-FeSe belongs to tetragonal (P 4/nmm) group of symmetry at room temperature and is composed of Se-Fe 2 -Se layers [2], i.e. it has the same planar structure as LaOFeAs [3]. Following the FeSe discovery, considerable effort was made to investigate the effect of chemical substitutions, either to the Se-site or the Fe-site, on superconductivity.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

et al. 2010

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“…Thus, it is expected that the study of superconductivity in FeSe will be valuable in understanding the superconducting mechanism of pnictide superconductors. FeSe has a complicated phase diagram [9,10]. The superconductivity of FeSe can be enhanced by partially replacing Se with Te, where T c reaches a maximum of 15.2 K at about 50% Te substitution [11].…”

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confidence: 99%

Suppression of superconductivity in FeSe films under tensile strain

Nie¹,

Brahimi²,

Budnick³

et al. 2009

Applied Physics Letters

111

127

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We have studied the effect of tensile strain on the superconductivity in FeSe films. 50 nm, 100 nm, and 200 nm FeSe films were grown on MgO, SrTiO$_3$, and LaAlO$_3$ substrates by using a pulsed laser deposition technique. X-ray diffraction analysis showed that the tetragonal phase is dominant in all of our FeSe films. The 50 nm FeSe films on MgO and SrTiO$_3$ are under tensile strain, while the 50 nm FeSe film on LaAlO$_3$ and the other thick FeSe films are unstrained. Superconducting transitions have been observed in unstrained FeSe films with T$_{onset}$ $\approx$ 8 K, which is close to the bulk value. However, no sign of superconductivity has been observed in FeSe films under tensile strain down to 5 K. There is evidence to show that tensile strain suppresses superconductivity in FeSe films

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“…For FeAs-11 system, it is reported that the clean superconducting phase exists only in those samples with intentional Se deficiency [24,25], and single crystal samples are hardly obtained with a stoichiometric composition of 1:1. All of these suggest that the superconductivity may emerge or be enhanced by element substitution due to normative symmetry breaking in electronic structure, charge or stress etc.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity Modulated by Binary Doping in Nd1-xBaxFeAsO1-2xF2x

Qu¹,

Lu²,

Chen³

et al. 2011

JMP

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Binary doping effect is studied for the Fe-based superconductors of Nd 1-x Ba x FeAsO 1-2x F 2x (x = 0.02, 0.05, 0.1, 0.15, 0.2). The X-ray diffractions show that the c-axis lattice constant decreases monotonously with the doping content, in contrast to the little change in the a-axis. Temperature dependences of electric resistivity and magnetic susceptibility reveal that the superconductivity for the studied system emerges at x = 0.1, and enhances together with H c2 (0) as the doping content x increases further. In case of x = 0.2, the superconducting critical temperature reaches as high as 50 K, which is the first demonstration of superconductivity with a high fluorine-doping induced by both electron and hole doping in this family. Negative Hall coefficient (R H ) indicates that electron-type carriers are dominated in the present samples. The complicated temperature dependence of R H , is believed to arise from a multiband effect together with a complicated scattering, especially at the temperature near the T c .

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The paramagnetic properties of iron selenides with NiAs-type structure

Cited by 30 publications

References 19 publications

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Suppression of superconductivity in FeSe films under tensile strain

Superconductivity Modulated by Binary Doping in Nd<sub>1-x</sub>Ba<sub>x</sub>FeAsO<sub>1-2x</sub>F<sub>2x</sub>

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The paramagnetic properties of iron selenides with NiAs-type structure

Cited by 30 publications

References 19 publications

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

Suppression of superconductivity in FeSe films under tensile strain

Superconductivity Modulated by Binary Doping in Nd&lt;sub&gt;1-x&lt;/sub&gt;Ba&lt;sub&gt;x&lt;/sub&gt;FeAsO&lt;sub&gt;1-2x&lt;/sub&gt;F&lt;sub&gt;2x&lt;/sub&gt;

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Superconductivity Modulated by Binary Doping in Nd<sub>1-x</sub>Ba<sub>x</sub>FeAsO<sub>1-2x</sub>F<sub>2x</sub>