Nonstoichiometry of LixCu2O2+ single crystal and its relation to magnetic ordering
نویسندگان
چکیده
We report the first systematic study on the nonstoichiometry of Li/Cu ionic ratios x and oxygen defect concentrations in LixCu2O2+ solid solution. Nonstoichiometric crystals with intentional Li-deficient x=0.97 or Li-excessive x=1.06 concentrations were prepared by slow-cooling and floating-zone methods. By applying different oxygen pressures during growth, different magnitudes of oxygen defects were obtained, revealing varied magnetic and electrical properties. Our results strongly suggest that Li/Cu and oxygen nonstoichiometry in these crystals are responsible for the varied temperatures of helimagnetic ordering. © 2010 American Institute of Physics. doi:10.1063/1.3483244
منابع مشابه
Structural, Magnetic and Catalytic Properties of Non-Stoichiometric Lanthanum Ferrite Nano-Perovskites in Carbon Monoxide Oxidation
Perovskite-type oxides of LaFe(1+x)O(3+δ) (x = 0.0, 0.2, 0.5 and 0.7) were synthesized by citrate sol–gel methodto ensure the formation of nanosized perovskites. The physicochemical properties of these LaFe(1+x)O(3+δ)materials were characterized by thermal gravimetric/differential analyses, Fourier transform infraredspectroscopy, X-ray powder diffraction, scanning electron and...
متن کاملOxygen nonstoichiometry and the origin of Na ion ordering in P2-NaxCoO2
Citation Shu, G. J. et al. " Oxygen nonstoichiometry and the origin of Na ion ordering in P2-Na_{x}CoO_{2}. " Physical Review B 82.5 (2010): 054106. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access ...
متن کاملFloating-zone growth of KxFe2-ySe2 single crystals
The discovery of superconductivity at temperatures above 30 K in KxFe2-ySe2 compounds has attracted considerable attention [1]. The crystal structure of KxFe2-ySe2 descends from the well-known ThCr2Si2 structure with vacancies at the Fe sites. It was soon found that magnetism and superconductivity coexist in AxFe2-ySe2 (A = K, Rb, and Cs) [2-3]. Even in single crystals which show full shielding...
متن کاملNonstoichiometry and Weyl fermionic behavior in TaAs
The band structure of TaAs provides the necessary conditions for the emergence of Weyl fermions. Measurements verifying this fact are remarkably robust, given the reported levels of nonstoichiometry in typical single crystals. Here we demonstrate the surprising fact that a small degree of nonstoichiometry is essential for such observations in a wide range of temperatures. From first principles,...
متن کاملInvestigation of effect of magnetic ordering on structural and electronic properties of double perovskites Sr2BWO6 (B = Co, Ni, Cu) using ab initio method
Structural and electronic properties of double perovskites Sr2BWO6 (B = Co, Ni, Cu) were studied for each of three magnetic configurations nonmagnetic, ferromagnetic, and antiferromagnetic by using density functional theory in generalized gradient approximations (GGA) and strong correlation correction (GGA + U). Due to magnetic transition from antiferromagnetic to nonmagnetic phase, an electr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2010