Coexistence of antiferromagnetic order and superconductivity in organic conductors
Coexistence of antiferromagnetic order and superconductivity in organic conductors
复制标题
有机导体中反铁磁序与超导性的共存
DOI：
10.1016/s0277-5387(01)00658-1
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发表时间：
2001
期刊：
影响因子：
2.6
通讯作者：
P. Cassoux
中科院分区：
文献类型：
--
作者：
H. Kobayashi;Hisashi Tanaka;E. Ojima;H. Fujiwara;T. Otsuka;A. Kobayashi;M. Tokumoto;P. Cassoux
最近，我们发现了各种磁性有机导体表现出新的电和磁性能，其中磁性和导电性之间的相互作用起着至关重要的作用。（BETS）2FeX_4 [BETS=bis（ethylenedithio）tetraselenafulvalene]中主要有两种晶型（λ和κ）。在三斜晶系变体λ-（BETS）2FeCl 4中，BETS层中的传导电子与FeCl 4 −阴离子上的自旋相互作用，产生反铁磁绝缘基态。但是这个系统在高压下变成了超导体。此外，λ-（BETS）2FexGa 1 − xCl 4（0.35<x<0.5）经历了前所未有的超导体到绝缘体的转变。斜方晶系的κ-（BETS）_2FeBr_4是第一个反铁磁有机超导体（TN=2.4K，Tc=1.1K）。比热测量结果表明，在低于Tc的温度下，磁有序和超导电性共存。T_N以下的反铁磁金属相的易磁化轴平行于a轴，磁化强度的场依赖性在2 T附近表现出变磁行为。最近，我们发现等结构的λ-（BETS）_2FeCl_4在较低温度下也发生了类似的磁性和超导转变。
We have recently found various magnetic organic conductors exhibiting novel electric and magnetic properties, where the interplay between magnetism and conductivity play an essential role. There are mainly two types of crystal modification (λ and κ) in (BETS)2FeX4[BETS=bis(ethylenedithio)tetraselenafulvalene]. In the triclinic modification, λ-(BETS)2FeCl4, conduction electrons in the BETS layers interact with spins localized on the FeCl4−anions to give an antiferromagnetic insulating ground state. But the system becomes a superconductor at high pressure. In addition, λ-(BETS)2FexGa1−xCl4(0.35<x<0.5) undergoes an unprecedented superconductor-to-insulator transition. The orthorhombic modification, κ-(BETS)2FeBr4, has been revealed to be the first antiferromagnetic organic superconductor (TN=2.4K and Tc=1.1K). The specific heat measurements showed evidence for the coexistence of magnetic order and superconductivity below Tc. The easy axis of the antiferromagnetic metal phase below TNis parallel to the a axis and the field dependence of the magnetization showed a metamagnetic behavior around 2T. Recently, we have found that isostructural λ-(BETS)2FeCl4undergoes similar magnetic and superconducting transitions at lower temperatures.
影响因子：
15
作者：
Kobayashi, H;Tomita, H;Cassoux, P
通讯作者：
Cassoux, P