12254-85-2Relevant academic research and scientific papers
Single crystal growth of the new pressure-induced-superconductor CrAs via chemical vapor transport
Zhu, Xiangde,Ling, Langsheng,Han, Yuyan,Xu, Junmin,Wang, Yongjian,Zhang, Hongwei,Zhang, Changjin,Pi, Li,Zhang, Yuheng
, p. 57 - 60 (2016)
Mono-arsenide CrAs, endures a helical anti-ferromagnetic order transition at ～265 K under ambient pressure. Recently, pressure-induced-superconductivity was discovered vicinity to the helical anti-ferromagnetic order in CrAs [Wei Wu et al., Nature Communications 5, 5508 (2014).]. However, the size of crystal grown via tin flux method is as small as 1 mm in longest dimension. In this work, we report the single crystal growth of CrAs with size of 1 × 5 × 1 mm3 via chemical vapor transport method and its physical properties.
Synthesis, structural, and transport properties of Cr-doped BaTi2As2O
Ji, Qiucheng,Ma, Yonghui,Hu, Kangkang,Gao, Bo,Mu, Gang,Li, Wei,Hu, Tao,Zhang, Ganghua,Zhao, Qingbiao,Zhang, Hui,Huang, Fuqiang,Xie, Xiaoming
, p. 13089 - 13092 (2014)
The interplay between unconventional superconductivity and the ordering of charge/spin density wave is one of the most vital issues in both condensed matter physics and material science. The Ti-based compound BaTi2As2O, which can be seen as the parent phase of superconducting BaTi2Sb2O, has a layered structure with a space group P4/mmm, similar to that of cuprate and iron-based superconductors. This material exhibits a charge density wave (CDW) ordering transition revealed by an anomaly at around 200 K in transport measurements. Here, we report the synthesis and systematical study of the physical properties in Cr-doped BaTi2-xCrxAs2O (x = 0-0.154) and demonstrate that the transition temperature of the CDW ordering is suppressed gradually by the doped Cr element. The magnetization measurements confirm the evolution of the CDW ordering transition. These observed behaviors are similar to that observed in iron-based superconductors, but no superconductivity emerges down to 2 K. In addition, the first-principles calculations are also carried out for well-understanding the nature of experimental observations.
DOUBLE EXCHANGE IN CrxMn1 - xAs COMPOUNDS.
Woehl,Berg,Baerner
, p. 179 - 190 (1980)
The magnetic moment M and the specific resistivity rho are measured for temperatures between 5 and 300 K and for eight different compositions. Characteristic temperatures are used to construct a magnetic phase diagram. The magnetic phases between ferromagnetic MnAs and antiferromagnetic CrAs are explained on the basis of two competing superexchange-double exchange magnetic couplings.
ON THE MnP reversible reaction NiAs-TYPE TRANSITION IN Mn0. 63Cr0. 37As: STRUCTURAL AND THERMODYNAMIC PROPERTIES.
Fjellvag,Gronvold,Kjekshus,Stolen
, p. 355 - 363 (1988)
The displacive MnP reversible reaction NiAs-type structural transition and the coupled magnetic spin conversion in Mn//0//. //6//3Cr//0//. //3//7As have studied by adiabatic shield type calorimetry and by powder X-ray and neutron diffraction. The structur
Superconductivity of 2.2K under pressure in helimagnet CrAs
Kotegawa, Hisashi,Nakahara, Shingo,Tou, Hideki,Sugawara, Hitoshi
, (2014)
We report resistivity measurements of the helimagnet CrAs under pressures. The helimagnetic transition with TN ～ 265K at ambient pressure is completely suppressed above a critical pressure of Pc ～ 0.7 GPa, and superconductivity is observed at ～2.2K for zero resistance, which exists in a wide pressure range extending beyond 3 GPa. Both the upper critical field Hc2 and the coeffi cient A in the resistivity increase toward Pc, suggesting that the superconductivity of CrAs is mediated by electronic correlations enhanced in the vicinity of the helimagnetic phase.
Magnetic and structural properties of pseudo-binary compounds CrAs 1-xPx
Kanaya,Abe,Yoshida,Kamigaki,Kaneko
, p. 189 - 194 (2004)
Structural and magnetic properties of pseudo-binary compounds CrAs 1-xPx (0≦x≦1) with the MnP-type structure have been studied by X-ray diffraction, magnetic susceptibility measurements, and differential thermal analysis. For the compounds with x=0 and 0.03, the lattice parameters a and c increase abruptly, and b and v (unit cell volume) decrease abruptly at 265 and 110K, respectively, which are considered to correspond to the Néel temperature (TN), as temperature increases. Magnetic susceptibility of all the prepared compounds shows feasible temperature dependence at temperatures from 4.2 to 300K. The decrease of TN with x is discussed based on the x dependence of lattice parameters.
Next-nearest neighbour contributions to the XPS binding energies and XANES absorption energies of P and As in transition-metal arsenide phosphides MAs 1-yPy having the MnP-type structure
Grosvenor, Andrew P.,Cavell, Ronald G.,Mar, Arthur
, p. 2549 - 2558 (2009/02/06)
X-ray photoeleetron spectroscopic (XPS) and X-ray absorption near-edge spectroscopic (XANES) measurements have been made for several series of metal arsenide phosphides MAs1-yPy, (M= Co, Fe, Cr) that adopt the MnP-type structure. The P and As XPS binding energies (BEs) and XANES absorption energies of the metal arsenide phosphides do not follow the trend observed for the simple binary phosphides or arsenides, a deviation that arises from the combination of nearest and nextnearest neighbour contributions acting on the P or As photoemission or absorption site. The P 2p3/2 BEs and K-edge absorption energies are lower in MAs1-yPy than in MP because the P atoms are more negatively charged and because the P photoemission or absorption site is screened to a greater extent by less positively charged nearest-neighbour M atoms and more negatively charged next-nearest neighbour P atoms. The As L3- and K-edge absorption energies are higher in MAs1-yPy than in MAs primarily because the As atoms are less negatively charged. The M charge has been evaluated from analysis of the M 2p XPS spectra and the M L- and K-edge XANES spectra.
Transition Metal Pnictide Synthesis: Self Propagating Reactions Involving Sodium Arsenide, Antimonide and Bismuthide
Hector, Andrew L.,Parkin, Ivan P.
, p. 477 - 482 (2007/10/02)
Initiation of the reaction between Na3E (E=As, Sb, Bi) and anhydrous metal halides at 25 to 550 deg C produces metal arsenides MxAsy (M = Y, La, Ti, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Pt, Cu and Zn) and antimonides MxSby (M = Ti, V, Nb, Ta, Cr, Fe, Co, Ni, Pt, Cu and Zn) via an exothermic selfpropagating reaction.The metal arsenides were characterized by X-ray powder diffraction, SEM/EDAX, microanalysis and FT-IR. - Keywords: Metal Arsenide, Sodium Arsenide, Metal Antimonide, Sodium Antimonide, Solid State Methathesis
