Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
Phys Rev Lett. 2012 Nov 2;109(18):187004. doi: 10.1103/PhysRevLett.109.187004.
We report the discovery of a pressure-induced heavy fermion superconductivity in a nonmagnetic orbital ordering state in the cubic compound PrTi(2)Al(20). In particular, we found that the transition temperature and the effective mass associated with the superconductivity are dramatically enhanced as the system approaches the putative quantum critical point of the orbital order. Our experiment indicates that the strong orbital fluctuations may provide a nonmagnetic glue for Cooper pairing.
我们报道了在立方化合物 PrTi(2)Al(20) 的非磁性轨道有序相中发现的压力诱导的重费米子超导性。特别是，我们发现随着系统接近轨道有序的假设量子临界点，超导的转变温度和与之相关的有效质量显著增强。我们的实验表明，强轨道波动可能为库珀配对提供非磁性胶。
