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arXiv 1801.01010cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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准一维结构Na2Cr3As3的离子交换合成及其8.6 K超导电性

Ion-exchange synthesis and superconductivity at 8.6 K of Na2Cr3As3 with quasi-one-dimensional crystal structure

Qing-Ge Mu, Bin-Bin Ruan, Bo-Jin Pan, Tong Liu, Jia Yu, Kang Zhao, Gen-Fu Chen, Zhi-An Ren

摘要:

采用离子交换法在萘钠溶液中合成了一种新的Cr基准一维超导体Na 2Cr 3As 3。晶体呈线状,空间群为P-6 m2(No.187),(Cr_3As_3)_2-线性链被Na ~+离子隔开,晶格参数为a = 9.239(2)<$,c = 4.209(6)<$。电阻率、磁化率和热容的测量结果表明,在8.6K的Tc处发生了具有非常规特征的超导转变,超过了以往报道的所有Cr基超导体。

英文摘要:

A new Cr-based quasi-one-dimensional superconductor Na2Cr3As3 was synthesized by an ion-exchange method in sodium naphthalenide solution. The crystals are thread-like and the structure was analyzed by X-ray diffraction with a noncentrosymmetric hexagonal space group P-6m2 (No. 187), in which the (Cr3As3)2- linear chains are separated by Na+ ions, and the refined lattice parameters are a = 9.239(2) Å and c = 4.209(6) Å. The measurements for electrical resistivity, magnetic susceptibility, and heat capacity reveal a superconducting transition with unconventional characteristic at the Tc of 8.6 K, which exceeds that of all previously reported Cr-based superconductors.

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