Superconductivity in Layered Pnictides BaRh2P2 and BaIr2P2
Superconductivity in Layered Pnictides BaRh2P2 and BaIr2P2
复制标题
DOI：
10.1143/jpsj.78.023706
复制
发表时间：
2009-02
期刊：
影响因子：
--
通讯作者：
D. Hirai;T. Takayama;R. Higashinaka;H. Aruga-Katori;H. Takagi
中科院分区：
文献类型：
--
作者：
D. Hirai;T. Takayama;R. Higashinaka;H. Aruga-Katori;H. Takagi
BaRh_2 P_2（Tc = 1.0 K）和BaIr_2 P_2（Tc = 2.1 K）与（Ba，K）Fe_2As_2同构，具有体超导电性，表明在多种层状过渡金属磷属元素化合物上出现了超导电性。正常状态下的电子比热系数γ，BaRh_2 P_2和BaIr_2 P_2分别为9.75和6.86 mJ/mol K_2，表明这两种化合物的电子态密度中等偏大，但小于Fe磷属元素化物超导体。接近1的威尔逊比确实意味着不存在强电子相关性和磁波动，不像铁磷属元素化物。
Bulk superconductivity was discovered in BaRh2P2 (Tc = 1.0 K) and BaIr2P2 (Tc = 2.1 K), which are isostructural to (Ba,K)Fe2As2, indicative of the appearance of superconductivity over a wide variety of layered transition metal pnictides. The electronic specific heat coefficient gamma in the normal state, 9.75 and 6.86 mJ/mol K2 for BaRh2P2 and BaIr2P2 respectively, indicate that the electronic density of states of these two compounds are moderately large but smaller than those of Fe pnictide superconductors. The Wilson ratio close to 1 indeed implies the absence of strong electron correlations and magnetic fluctuations unlike Fe pnictides.