Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr1−xEuxPt4Ge12

作     者：R. B. Adhikari D. L. Kunwar I. Jeon M. B. Maple M. Dzero C. C. Almasan 

作者机构：Department of Physics Kent State University Kent Ohio 44242 USA Center for Advanced Nanoscience University of California San Diego La Jolla California 92093 USA Materials Science and Engineering Program University of California San Diego La Jolla California 92093 USA Department of Physics University of California at San Diego La Jolla California 92903 USA 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2018年第98卷第6期

页      面：064506-064506页

核心收录：

基　　金：Kansas State University, KSU Basic Energy Sciences, BES U.S. Department of Energy, USDOE Division of Materials Sciences and Engineering, DMSE, (DE-SC0016481, DE-FG02-04ER46105) National Science Foundation, NSF, (DMR-1505826, DMR-1506547, 1505826) 

主　　题：Superconductivity 

摘      要：Motivated by current research efforts toward exploring the interplay between magnetism and superconductivity in multiband electronic systems, we have investigated the effects of Eu substitution through thermodynamic measurements on the superconducting filled skutterudite alloys Pr1−xEuxPt4Ge12. An increase in Eu concentration leads to a suppression of the superconducting transition temperature consistent with an increase of magnetic entropy due to Eu local moments. While the low-temperature heat capacity anomaly is present over the whole doping range, we find that in alloys with x≤0.5, the Schottky peaks in the heat capacity in the superconducting state appear to be due to Zeeman splitting by an internal magnetic field. Our theoretical modeling suggests that this field is a result of the short-range antiferromagnetic correlations between the europium ions. For the samples with x0.5, the peaks in the heat capacity signal the onset of antiferromagnetic ordering of the Eu moments.