Since the discovery of high-temperature superconductivity(SC) in quasi-two-dimensional copper oxides,a few layered compounds,which bear similarities to the cuprates,have also been found to host the unconventional SC. ...Since the discovery of high-temperature superconductivity(SC) in quasi-two-dimensional copper oxides,a few layered compounds,which bear similarities to the cuprates,have also been found to host the unconventional SC. Our recent observation of SC at 6.1 K in correlated electron material K2Cr3As3 represents an obviously different paradigm,primarily because of its quasi-one-dimensional(Q1D) nature. The new material is structurally featured by the [(Cr3As3)2-]∞ double-walled subnano-tubes composed of face-sharing Cr6/2(As6/2) octahedron linear chains,which are well separated by the columns of K+ counterions. Later,an isostructural superconducting Rb2Cr3As3 was synthesized,thus forming a new superconducting family. Here we report the third member,Cs2Cr3As3,which possesses the largest interchain distance. SC appears below 2.2 K. Similar to the former two sister compounds,Cs2Cr3As3 exhibits a non-Fermi liquid behavior with a linear temperature dependence of resistivity in the normal state,and a high upper critical field beyond the Pauli limit as well,suggesting a common unconventional SC in the Q1 D Cr-based material.展开更多
基金supported by the National Natural Science Foundation of China (11190023 and 11474252)the National Basic Research Program of China (2011CBA00103)the Fundamental Research Funds for the Central Universities of China
文摘Since the discovery of high-temperature superconductivity(SC) in quasi-two-dimensional copper oxides,a few layered compounds,which bear similarities to the cuprates,have also been found to host the unconventional SC. Our recent observation of SC at 6.1 K in correlated electron material K2Cr3As3 represents an obviously different paradigm,primarily because of its quasi-one-dimensional(Q1D) nature. The new material is structurally featured by the [(Cr3As3)2-]∞ double-walled subnano-tubes composed of face-sharing Cr6/2(As6/2) octahedron linear chains,which are well separated by the columns of K+ counterions. Later,an isostructural superconducting Rb2Cr3As3 was synthesized,thus forming a new superconducting family. Here we report the third member,Cs2Cr3As3,which possesses the largest interchain distance. SC appears below 2.2 K. Similar to the former two sister compounds,Cs2Cr3As3 exhibits a non-Fermi liquid behavior with a linear temperature dependence of resistivity in the normal state,and a high upper critical field beyond the Pauli limit as well,suggesting a common unconventional SC in the Q1 D Cr-based material.
