论文标题
在高压下，RBMN6BI5中抗铁磁秩序边界上超导性的出现：基于MN的新家族
Emergence of superconductivity on the border of antiferromagnetic order in RbMn6Bi5 under high pressure: A new family of Mn-based superconductors
论文作者
论文摘要
非常规超导性领域的进步在很大程度上是由新型超导系统的发现驱动的。在这里，我们通过测量高压下的电阻率和磁敏感性，在准磁序中发现了反铁磁顺序的边界上的超导性。随着压力的增加，首先在环境压力下用Tn = 83 K的抗磁磁过渡适度增强，然后在PC = 13 GPA的临界压力下完全抑制，在该临界压力= 13 GPA周围围绕大量超导性，并表现出最大的TC_ONSET = 9.5 k的圆顶样TC（P）。它的温度压力相图类似于许多磁性介导的超导系统的温度相图。此外，PC周围的超导状态的特征是超过Pauli极限的大型上临界场μ0HC2（0），阐述了可能的非常规的削皮机制。本研究以及我们最近在KMN6BI5（TCMAX = 9.3 K）的工作使AMN6BI5（A =碱金属）成为具有相对较高TC的新的基于MN的超导体。
The advances in the field of unconventional superconductivity are largely driven by the discovery of novel superconducting systems. Here we report on the discovery of superconductivity on the border of antiferromagnetic order in a quasi-one-dimensional RbMn6Bi5 via measurements of resistivity and magnetic susceptibility under high pressures. With increasing pressure, its antiferromagnetic transition with TN = 83 K at ambient pressure is first enhanced moderately and then suppressed completely at a critical pressure of Pc = 13 GPa, around which bulk superconductivity emerges and exhibits a dome-like Tc(P) with a maximal Tc_onset = 9.5 K at about 15 GPa. Its temperature-pressure phase diagram resembles those of many magnetism-mediated superconducting systems. In addition, the superconducting state around Pc is characterized by a large upper critical field μ0Hc2(0) exceeding the Pauli limit, elaborating a possible unconventional paring mechanism. The present study, together with our recent work on KMn6Bi5 (Tcmax = 9.3 K), makes AMn6Bi5 (A= Alkali metal) a new family of Mn-based superconductors with relatively high Tc.
