Journal ArticleDOI
Investigation of Oxygen-Adsorbed Iron Pnictide Crystals
TLDR
In this article, a new compound of YbFe2As2 was synthesized by using a melt growth technique, which was characterized by scanning electron microscopy and energy dispersive X-ray analysis (EDAX).Abstract:
In this present study, we synthesized a new compound of YbFe2As2 crystals by using a melt growth technique. The YbFe2As2 crystals had been characterized by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). The presence of oxygen was found by EDAX on the surfaces of grown YbFe2As2 crystals which had been kept in air ambience for few months. The measurement of magnetization (M) versus temperature (T) using a superconducting quantum interference device (SQUID) at constant magnetic field (H = 100 Oe) for oxygen-adsorbed YbFe2As2 (YbFe2As2:O2) had revealed an occurrence of sharp slope change around 140 K. An additional slope change had been observed around 40 K. We had carried out magnetization and transport measurements for oxygen-adsorbed YbFe2As2 (YbFe2As2:O2) and oxygen-adsorbed BaFe2As2 (BaFe2As2:O2) for comparative study also. M versus T data at H = 10,000 Oe had exhibited a paramagnetic behavior for both YbFe2As2:O2 and BaFe2As2:O2. The result of M versus H measurements at 2 K had shown that the saturation had not been achieved for YbFe2As2:O2 at H = 80,000 Oe. There was a slope change observed in transport measurement for YbFe2As2:O2 at 15 K which was not noticed for BaFe2As2:O2.read more
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Aging effect in Magnetotransport Property of Oxygen adsorbed BaFe2As2
Nilotpal Ghosh,Santhosh Raj +1 more
TL;DR: In this paper, the presence of oxygen on the surfaces of flux grown BaFe2As2 single crystals which were kept in air ambience for several months was found by Energy Dispersive X-ray Analysis (EDAX).
Journal ArticleDOI
X-ray photoelectron spectroscopy study on YbFe2As2 crystals prepared by different growth temperatures
TL;DR: In this article, a double-step solid-state reaction method was used to synthesize polycrystalline samples of YbFe2As2 by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive Xray analysis (EDAX), and Xray photoelectron spectroscopy (XPS).
Journal ArticleDOI
Evidence of strong correlation and magnetotransport scaling in YbFe2As2
TL;DR: In this article , the scaling analysis of magnetoresistance has been carried out and the verification of Kohler's rule has been explored in YbFe 2 As 2 crystal is found that satisfies an unusual scaling relationship between applied magnetic field and temperature within limited temperature range.
References
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Journal ArticleDOI
Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K
TL;DR: It is reported that a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F- ions at the O2- site and exhibits a trapezoid shape dependence on the F- content.
Journal ArticleDOI
The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
TL;DR: The response of the worldwide scientific community to the discovery in 2008 of superconductivity at T c'='26'K in the Fe-based compound LaFeAsO1−x F x has been very enthusiastic.
Journal ArticleDOI
High-temperature superconductivity in iron-based materials
TL;DR: The surprising discovery of high-temperature superconductivity in a material containing a strong magnet (iron) has led to thousands of publications as discussed by the authors, and it becomes clear what we know and where we are headed.
Journal ArticleDOI
Density functional study of LaFeAsO(1-x)F(x): a low carrier density superconductor near itinerant magnetism.
David J. Singh,Mao-Hua Du +1 more
TL;DR: LaFeAs(O,F) is in a unique class of high T(c) superconductors: high N(E(F))) ionic metals near magnetism.
Journal ArticleDOI
Spin-density-wave anomaly at 140 K in the ternary iron arsenide BaFe 2 As 2
TL;DR: The ternary iron arsenide (BaFe) is a poor Pauli-paramagnetic metal and undergoes a structural and magnetic phase transition at 140 K, accompanied by strong anomalies in the specific heat, electrical resistance, and magnetic susceptibility.