Magnetism in Quasi-One-Dimensional A2Cr3As3 (A=K,Rb) Superconductors
WU Xian-Xin1, LE Cong-Cong1, YUAN Jing1, FAN Heng1,2, HU Jiang-Ping1,2,3**
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Collaborative Innovation Center of Quantum Matter, Beijing 100190 3Department of Physics, Purdue University, West Lafayette 47907, USA
We predict that the recently discovered quasi-one-dimensional superconductors, A2Cr3As3 (A=K,Rb), possess strong frustrated magnetic fluctuations and are nearby a novel in-out co-planar magnetic ground state. The frustrated magnetism is very sensitive to the c-axis lattice constant and can thus be suppressed by increasing pressure. Our results qualitatively explain strong non-Fermi liquid behaviors observed in the normal state of the superconductors as the intertwining between the magnetism and superconductivity can create a large quantum critical region in quasi-one-dimensional systems and also suggest that the materials share similar phase diagrams and superconducting mechanism with other unconventional superconductors, such as cuprates and iron-based superconductors.
2015, Vol. 32 
