منابع مشابه
Structure and Anisotropic Properties of BaFe 2 - x Ni x As 2 ( x = 0 , 1 , 2 ) Single Crystals
The crystal structure, anisotropic electrical resistivity and magnetic susceptibility, as well as specific heat results from single crystals of BaFe2As2, BaNi2As2, and BaFeNiAs2 are surveyed. BaFe2As2 properties demonstrate the equivalence of C(T), Fisher’s d(T)/dT, and d/dT results in determining the antiferromagnetic transition at TN = 132(1) K. BaNi2As2 shows a structural phase transition ...
متن کاملMAGNETIC AND ELECTRICAL PROPERTIES OF Co(AsxS1-x)2 AND Ni(AsxS1-x)2
The magnetic and electrical properties of Co(AsxS1-~)2 are investigated and the phase diagrams are shown. In CO(AS~SI-~)Z, the outbreak concentration of the ferromagnetism is obtained to be xc = 0.37 + 0.01, while the critical concentration of the metal-non metal transition is determined to be X ; = 0.47 f 0.01. The results obtained are explained by site and bond percolation mechanisms in the d...
متن کاملElectronic correlations and unconventional spectral weight transfer in the high-temperature pnictide BaFe(2-x)Co(x)As(2) superconductor using infrared spectroscopy.
We report an infrared optical study of the pnictide high-temperature superconductor BaFe(1.84)Co(0.16)As(2) and its parent compound BaFe(2)As(2). We demonstrate that electronic correlations are moderately strong and do not change across the spin-density wave transition or with doping. By examining the energy scale and direction of spectral weight transfer, we argue that Hund's coupling J is the...
متن کامل1 2 A ug 2 00 9 Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe 2 ( As 1 − x P x ) 2
We report bulk superconductivity induced by an isovalent doping of phosphorus in BaFe2(As1−xPx)2. The P-for-As substitution results in shrinkage of lattice, especially for the FeAs block layers. The resistivity anomaly associated with the spin-density-wave (SDW) transition in the undoped compound is gradually suppressed by the P doping. Superconductivity with the maximum Tc of 30 K emerges at x...
متن کاملLarge temperature dependence of the number of carriers in co-doped BaFe(2)As(2).
Using angle-resolved photoemission spectroscopy, we study the evolution of the number of carriers in Ba(Fe(1-x)Co(x))(2)As(2) as a function of Co content and temperature. We show that there is a k-dependent energy shift compared to density functional calculations, which is large below 100 K at low Co contents and reduces the volume of hole and electron pockets by a factor 2. This k shift become...
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ژورنال
عنوان ژورنال: EPL (Europhysics Letters)
سال: 2010
ISSN: 0295-5075,1286-4854
DOI: 10.1209/0295-5075/90/37005