μSR and neutron diffraction investigations on the reentrant ferromagnetic superconductor Eu(Fe0.86Ir0.14)2As2

V. K. Anand; D. T. Adroja; A. Bhattacharyya; U. B. Paramanik; P. Manuel; A. D. Hillier; D. Khalyavin; Z. Hossain

doi:10.1103/PhysRevB.91.094427

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μSR and neutron diffraction investigations on the reentrant ferromagnetic superconductor Eu(Fe0.86Ir0.14)2As2

V. K. Anand, D. T. Adroja, A. Bhattacharyya, U. B. Paramanik, P. Manuel, A. D. Hillier, D. Khalyavin, Z. Hossain

DOI 10.1103/PhysRevB.91.094427 · Physical Review B

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Abstract

Results of muon spin relaxation (μSR) and neutron powder diffraction measurements on a reentrant superconductor Eu(Fe0.86Ir0.14)2As2 are presented. Eu(Fe0.86Ir0.14)2As2 exhibits superconductivity at Tcon≈22.5 K competing with long range ordered Eu+2 moments below ≈18 K. A reentrant behavior (manifested by nonzero resistivity in the temperature range 10–17.5 K) results from an exquisite competition between the superconductivity and magnetic order. The zero field μSR data confirm the long range magnetic ordering below TEu=18.7(2) K. The transition temperature is found to increase with increasing magnetic field in longitudinal field μSR which along with the neutron diffraction results, suggests the transition to be ferromagnetic. The neutron diffraction data reveal a clear presence of magnetic Bragg peaks below TEu which could be indexed with propagation vector k=(0,0,0), confirming a long range magnetic ordering in agreement with μSR data. Our analysis of the magnetic structure reveals an ordered magnetic moment of 6.29(5)μB (at 1.8 K) on the Eu atoms and they form a ferromagnetic structure with moments aligned along the c axis. No change in the magnetic structure is observed in the reentrant or superconducting phases and the magnetic structure remains same for 1.8K≤T≤TEu. No clear evidence of structural transition or Fe moment ordering was found.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Eu(Fe0.86Ir0.14)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22.5	Pressure not reported	onset
Eu(Fe0.86Ir0.14)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	21.5	Pressure not reported	unknown
Eu1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown
Eu0.5K0.5Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown
Eu(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	21	Pressure not reported	unknown
EuFe2(As1-xPx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
EuFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	2.5 GPa	unknown