ACTA

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

S.J. Lewandowski^a, M. Berkowski^a, V.Yu. Tarenkov^b, A.I. D'yachenko^b, A. Abal'oshev^a, I. Abal'osheva^a, D. Gawryluk^a, V. Domukhovski^a, S.L. Sidorov^b and D.I. Boichenko^b
^aInstytut Fizyki PAN, al. Lotników 32/46, 02-668 Warszawa, Poland
^bDonetsk Institute for Physics and Engineering, R. Luxemburg 72, 83114 Donetsk, Ukraine

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We report on measurements of samples with nominal composition FeSe_0.5Te_0.5, crystallized by the Bridgman method. Magnetic and transport properties of the samples were examined. The measurements confirm the coexistence of ferromagnetism and superconductivity below the superconducting transition temperature. The ferromagnetic contribution to magnetization, estimated at 10%, might be caused by the presence of ferrimagnetic Fe₇Se₈, which occupies about 10% of sample volume. From the Andreev spectroscopy we found superconducting energy gap Δp = 2.6 meV at T = 4.2 K, and from magnetization measurements the critical temperature T_c = 15.8 K. The critical current density in magnetic field H = 4 kOe, determined from magnetization measurements, is j_c = (1-2) × 10⁴ A/cm² and weakly depends on magnetic field intensity.

DOI: 10.12693/APhysPolA.118.289
PACS numbers: 74.25.Ha, 74.45.+c, 74.62.Bf, 74.70.Xa, 75.30.Cr