Lombardi Gustavo A, Mydeen Kamal, Gumeniuk Roman, Leithe-Jasper Andreas, Schnelle Walter, Dos Reis Ricardo D, Nicklas Michael
Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas 13083-970, SP, Brazil.
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
Materials (Basel). 2022 Apr 8;15(8):2743. doi: 10.3390/ma15082743.
We carried out electrical resistivity and X-ray diffraction (XRD) studies on the filled skutterudite superconductors LaPt4Ge12 and PrPt4Ge12 under hydrostatic pressure. The superconducting transition temperature Tc is linearly suppressed upon increasing pressure, though the effect of pressure on Tc is rather weak. From the analysis of the XRD data, we obtain bulk moduli of B=106 GPa and B=83 GPa for LaPt4Ge12 and PrPt4Ge12, respectively. The knowledge of the bulk modulus allows us to compare the dependence of Tc on the unit-cell volume from our pressure study directly with that found in the substitution series La1-xPrxPt4Ge12. We find that application of hydrostatic pressure can be characterized mainly as a volume effect in LaPt4Ge12 and PrPt4Ge12, while substitution of Pr for La in La1-xPrxPt4Ge12 yields features going beyond a simple picture.
我们对填充式方钴矿超导体LaPt4Ge12和PrPt4Ge12在静水压力下进行了电阻率和X射线衍射（XRD）研究。随着压力增加，超导转变温度Tc呈线性下降，尽管压力对Tc的影响相当微弱。通过对XRD数据的分析，我们分别得到LaPt4Ge12和PrPt4Ge12的体模量B = 106 GPa和B = 83 GPa。体模量的知识使我们能够将压力研究中Tc对晶胞体积的依赖性与在替代系列La1-xPrxPt4Ge12中发现的依赖性直接进行比较。我们发现，在LaPt4Ge12和PrPt4Ge12中，静水压力的施加主要表现为体积效应，而在La1-xPrxPt4Ge12中用Pr替代La则产生了超出简单情况的特征。
