12254-85-2Relevant articles and documents
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.
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.
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.
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.
