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Symmetry of Order Parameters in Multiband Superconductors LaRu_{4}As_{12} and PrOs_{4}Sb_{12} Probed by Local Magnetization Measurements.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-17 , DOI: 10.1103/physrevlett.124.027001 J Juraszek 1 , R Wawryk 1 , Z Henkie 1 , M Konczykowski 2 , T Cichorek 1
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-17 , DOI: 10.1103/physrevlett.124.027001 J Juraszek 1 , R Wawryk 1 , Z Henkie 1 , M Konczykowski 2 , T Cichorek 1
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The temperature dependencies of the lower critical field H_{c1}(T) of several filled-skutterudite superconductors were investigated by local magnetization measurements. While LaOs_{4}As_{12} and PrRu_{4}As_{12} exhibit the H_{c1}(T) dependencies consistent with the single-band BCS prediction, for LaRu_{4}As_{12} (the superconducting temperature T_{c}=10.4 K) with a similar three-dimensional Fermi surface, we observe a sudden increase in H_{c1}(T) deep in a superconducting state below about 0.32T_{c}. Remarkably, a rapid rise of H_{c1}(T) at approximately the same reduced temperature 0.27T_{c} is also found for the heavy-fermion compound PrOs_{4}Sb_{12} (T_{c}≃1.78 K), in fair accord with the earlier macroscopic study. We attribute the unusual H_{c1}(T) dependencies of LaRu_{4}As_{12} and PrOs_{4}Sb_{12} to a kink structure in their superfluid densities due to different contributions from two nearly decoupled bands. Whereas LaRu_{4}As_{12} is established as a two-band isotropic s-wave superconductor, nonsaturating behavior of H_{c1}(T) is observed for PrOs_{4}Sb_{12}, indicative of an anisotropic structure of a smaller gap. For this superconductor with broken time-reversal symmetry, our findings suggest a superconducting state with multiple symmetries of the order parameters.
中文翻译：
通过局部磁化测量探查多频带超导体LaRu_ {4} As_ {12}和PrOs_ {4} Sb_ {12}中阶参数的对称性。
通过局部磁化测量研究了几种填充方钴矿超导体的下临界场H_ {c1}（T）的温度依赖性。LaOs_ {4} As_ {12}和PrRu_ {4} As_ {12}表现出与单波段BCS预测一致的H_ {c1}（T）依赖性，而LaRu_ {4} As_ {12}（超导温度） T_ {c} = 10.4 K），具有相似的三维费米表面，我们观察到在低于约0.32T_ {c}的超导状态下，H_ {c1}（T）深处突然增加。值得注意的是，重金属化合物PrOs_ {4} Sb_ {12}（T_ {c}≃1.78K）在近似相同的降低温度0.27T_ {c}处也迅速升高H_ {c1}（T）。与早期的宏观研究完全一致。我们将LaRu_ {4} As_ {12}和PrOs_ {4} Sb_ {12}的异常H_ {c1}（T）依赖性归因于其超流体密度的扭结结构，这是由于来自两个几乎解耦的谱带的贡献不同。尽管LaRu_ {4} As_ {12}被确立为两波段各向同性s波超导体，但对于PrOs_ {4} Sb_ {12}却观察到H_ {c1}（T）的非饱和行为，表明该结构是各向异性的。较小的差距。对于这种具有打破的时间反转对称性的超导体，我们的发现表明，具有多个对称的阶跃参数的超导状态。
更新日期：2020-01-17
中文翻译：
通过局部磁化测量探查多频带超导体LaRu_ {4} As_ {12}和PrOs_ {4} Sb_ {12}中阶参数的对称性。
通过局部磁化测量研究了几种填充方钴矿超导体的下临界场H_ {c1}（T）的温度依赖性。LaOs_ {4} As_ {12}和PrRu_ {4} As_ {12}表现出与单波段BCS预测一致的H_ {c1}（T）依赖性，而LaRu_ {4} As_ {12}（超导温度） T_ {c} = 10.4 K），具有相似的三维费米表面，我们观察到在低于约0.32T_ {c}的超导状态下，H_ {c1}（T）深处突然增加。值得注意的是，重金属化合物PrOs_ {4} Sb_ {12}（T_ {c}≃1.78K）在近似相同的降低温度0.27T_ {c}处也迅速升高H_ {c1}（T）。与早期的宏观研究完全一致。我们将LaRu_ {4} As_ {12}和PrOs_ {4} Sb_ {12}的异常H_ {c1}（T）依赖性归因于其超流体密度的扭结结构，这是由于来自两个几乎解耦的谱带的贡献不同。尽管LaRu_ {4} As_ {12}被确立为两波段各向同性s波超导体，但对于PrOs_ {4} Sb_ {12}却观察到H_ {c1}（T）的非饱和行为，表明该结构是各向异性的。较小的差距。对于这种具有打破的时间反转对称性的超导体，我们的发现表明，具有多个对称的阶跃参数的超导状态。
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