Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$

Abstract

Motivated by current research efforts towards 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 Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$. 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 $x\le 0.5$ 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 $x>0.5$, the peaks in the heat capacity signal the onset of antiferromagnetic (AFM) ordering of the Eu moments.

7 pages, 7 figures

References in corpus (15)

• Antiferromagnetic transition in EuFe${}_2$As${}_2$: A possible parent compound for superconductors
• Large adiabatic temperature and magnetic entropy changes in EuTiO3
• Superconductivity in the New Platinum Germanides MPt4Ge12 (M = Rare-earth and Alkaline-earth Metals) with Filled Skutterudite Structure
• Superconductivity in novel Ge-based skutterudites: {Sr,Ba}Pt_4Ge_{12}
• Phase diagram of iron-pnictides if doping acts as a disorder
• Superfluid Density and Energy Gap-Function of Superconducting PrPt4Ge12
• Evolution of crystalline electric field effects, superconductivity, and heavy fermion behavior in the specific heat of Pr(Os${}_{1-x}$Ru${}_x$)${}_4$Sb${}_{12}$
• Probing the superconductivity of PrPt4Ge12 through Ce substitution
• Magnetic penetration depth in disordered iron-based superconductors
• Mesoscopic gap fluctuations in an unconventional superconductor
• Multiband superconductivity in the correlated electron filled skutterudite system Pr(1-x)Ce(x)Pt4Ge12
• Transport, thermal and magnetic properties of RuSr_2(Gd_{1.5}Ce_{0.5})Cu_2O_{10-δ}, a magnetic superconductor
• Magnetic order in the filled skutterudites RPt4Ge12 (R = Nd, Eu)
• Crystal fields, disorder, and antiferromagnetic short-range order in Yb0.24Sn0.76Ru
• Reduced effect of impurities on the universal pairing scale in the cuprates

Cited by in corpus (1)

• Schottky anomaly and short-range antiferromagnetic correlations in filled skutterudites Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$