Influence of phase composition on the reentrant superconducting properties of Tm2Fe3Si5

H. Schmidt; M. Müller; H. F. Braun

doi:10.1103/PhysRevB.53.12389

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Influence of phase composition on the reentrant superconducting properties of Tm2Fe3Si5

H. Schmidt, M. Müller, H. F. Braun

DOI 10.1103/PhysRevB.53.12389 · Physical Review B

T1

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Abstract

The compound Tm2Fe3Si5 is the only known reentrant superconductor in which superconductivity is destroyed at the antiferromagnetic transition. Widely differing behavior has been reported in the literature regarding the occurrence of superconductivity ranging from transition temperatures around 1.7 K at atmospheric pressure to no superconductivity except under applied hydrostatic pressure. In order to clarify this situation, we carried out ac-susceptibility measurements under applied pressure and magnetization measurements as a function of phase composition within the homogeneity range of the compound and on multiphase samples. For single-phase samples, Tc decreases strongly in the whole pressure range with growing stoichiometric ratio Fe/Si. For multiphase samples, a shift of the Tc vs pressure curves to lower pressure values was observed. The high-temperature part of the susceptibility follows a Curie-Weiss law independent of phase composition which amounts to an effective magnetic moment per Tm atom of 7.0μB. With our results we are able to explain all the observed sample dependence of Tc with a combination of substitution effects in the homogeneity range of this compound and internal stress effects caused by impurity phases. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tm2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.7	Pressure unresolved	onset
Tm20.25Fe29.90Si49.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	0.9 GPa	midpoint
Tm20.25Fe30.90Si48.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.95	0.9 GPa	midpoint