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The growth techniques for MgxZn1-xO thin films have advanced at a rapid pace in recent years, enabling the application of this material to a wide range of optical and electrical applications. In designing structures and optimizing device…

Materials Science · Physics 2012-11-14 Y. Kozuka , J. Falson , Y. Segawa , T. Makino , A. Tsukazaki , M. Kawasaki

The phase diagrams of LaMnO$_3$ perovskites have been intensely studied due to the colossal magnetoresistance (CMR) exhibited by compositions around the $\frac{3}{8}^{th}$ doping level. However, phase segregation between ferromagnetic (FM)…

Strongly Correlated Electrons · Physics 2022-01-05 Wei-Tin Chen , Chin-Wei Wang , Ching-Chia Cheng , Yu-Chun Chuang , Arkadiy Simonov , Nicholas C. Bristowe , Mark S. Senn

ZnO is a promising candidate as an environment friendly thermoelectric (TE) material. However, the poor TE figure of merit (zT) needs to be addressed to achieve significant TE efficiency for commercial applications. Here we demonstrate that…

The phenomenally large enhancement in conductivity observed when Li-doped MgO crystals are oxidized at elevated temperatures was investigated by dc and ac electrical measurements in the temperature interval 250-673 K. The concentration of…

Materials Science · Physics 2009-11-07 M. M. Tardio , R. Ramirez , R. Gonzalez , Y. Chen

We report on the synthesis of low doping Zn$_{1-x}$Co$_x$O ($0<x<0.1$) thin films on (0001)-Al$_2$O$_3$ substrates. The films were prepared in an oxidizing atmosphere, using the pulsed laser deposition technique starting from Zn and Co…

Materials Science · Physics 2009-11-10 A. Fouchet , W. Prellier , P. Padhan , Ch. Simon , B. Mercey , V. N. Kulkarni , T. Venkatesan

The nature of the often reported room temperature ferromagnetism in transition metal doped oxides is still a matter of huge debate. Herein we report on room temperature ferromagnetism in high quality Co-doped ZnO (Zn1-xCoxO) bulk samples…

A series of Ni0.6-x/2Zn0.4-x/2SnxFe2O4 (x = 0.0, 0.05, 0.1, 0.15, 0.2 and 0.3) (NZSFO) ferrite composites have been synthesized from nano powders using standard solid state reaction technique. The spinel cubic structure of the investigated…

Materials Science · Physics 2017-08-02 M. A. Ali , M. M. Uddin , M. N. I. Khan , F. -U. -Z. Chowdhury , S. M. Hoque , S. I. Liba

We study the structural and magnetic properties of the MnBi inter-metallic compound. The LTP (Low Temperature Phase) MnBi compound is successfully synthesized in single step by vacuum encapsulation technique and rapid quenching from phase…

Strongly Correlated Electrons · Physics 2013-09-26 Nithya R. Christopher , Nidhi Singh , Shiva Kumar Singh , Bhasker Gahtori , S. K. Mishra , A. Dhar , V. P. S Awana

Doped transition-metal dichalcogenides monolayers exhibit exciting magnetic properties for the benefit of two-dimensional spintronic devices. Using density functional theory (DFT) incorporating Hubbard-type of correction (DFT$+U$) to…

Materials Science · Physics 2021-05-12 Adlen Smiri , Sihem Jaziri , Samir Lounis , Iann C. Gerber

Polycrystalline samples of the quarter-doped manganites $R_{0.75}$Ca$_{0.25}$MnO$_3$ ($R$ = Y, Tb, Dy, Ho, and Er) were studied by X-ray diffraction and AC/DC susceptibility measurements. All five samples are orthorhombic and exhibit…

Materials Science · Physics 2017-01-04 R. Sinclair , H. B. Cao , V. O. Garlea , M. Lee , E. S. Choi , Z. L. Dun , S. Dong , E. Dagotto , H. D. Zhou

The study uses AACVD technology with nitrogen carrier gas to make AZO thin films through which it determines structural, optical, and morphological changes from 0 to 20 percent aluminum doping. The depositions took place at 400 degrees…

The influence of Co2+ ions on the homogeneous nucleation of ZnO is examined. Using electronic absorption spectroscopy as a dopant-specific in situ spectroscopic probe, Co2+ ions are found to be quantitatively excluded from the ZnO critical…

Other Condensed Matter · Physics 2007-05-23 J. Daniel Bryan , Dana A. Schwartz , Daniel R. Gamelin

Semiconductor materials that can be doped both n-type and p-type are desirable for diode-based applications and transistor technology. Copper nitride (Cu3N) is a metastable semiconductor with a solar-relevant bandgap that has been reported…

Doping of MgB2 by nano-SiC and its potential for improvement of flux pinning was studied for MgB2-x(SiC)x/2 with x = 0, 0.2 and 0.3 and a 10wt% nano-SiC doped MgB2 samples. Co-substitution of B by Si and C counterbalanced the effects of…

Superconductivity · Physics 2009-11-07 S. X. Dou , S. Soltanian , J. Horvat , X. L. Wang , P. Munroe , S. H. Zhou , M. Ionescu , H. K. Liu , M. Tomsic

Clear evidence of ferromagnetic behavior at temperatures >400 K as well as spin polarization of the charge carriers have been observed in ZnMnO thin films grown on Al2O3 and MgO substrates. The magnetic properties depended on the exact Mn…

Electrical and magnetic properties of four series of manganates LnxCa1-xMnO3 (Ln=La, Nd, Gd and Y) have been studied in the electron doped regime (x=0.02-0.25) in order to investigate the various inter-dependent phenomena such as…

Materials Science · Physics 2009-11-07 L. Sudheendra , A. R. Raju , C. N. R. Rao

MgB2 monofilamentary nickel-sheated tapes and wires were fabricated by means of the ex-situ powder-in-tube method using either high-energy ball milled and low temperature synthesized powders. All sample were sintered at 920 C in Ar flow.…

$^{19}$F NMR measurements in optimally electron-doped La$_{1-y}$Y$_{y}$Fe$_{1-x}$Mn$_{x}$AsO$_{0.89}$F$_{0.11}$ superconductors are presented. In these materials the effect of Mn doping on the superconducting phase is studied for two series…

Systematic investigations of the structural and magnetic properties of single crystal (Ga,Mn)N films grown by metal organic vapor phase epitaxy are presented. High resolution transmission electron microscopy, synchrotron x-ray diffraction,…

In this paper we present a thorough first-principles based density functional theory study of the structural stability, electronic, magnetic, and optical properties of pristine and doped gallium phosphide (GaP) monolayers. The pristine GaP…

Materials Science · Physics 2023-09-26 Khushboo Dange , Rachana Yogi , Alok Shukla