title: Enhancement of local superconductivity in ferromagnetic FeCrB metallic glass by Ar+ ion irradiation.
abstract: We have reinforced local superconductivity in ferromagnetic Fe(67)Cr(18)B(15) metallic glasses by ion irradiation. Superconductivity in this medium appears due to the presence of large-scale layered clusters of metallic Fe-Cr phase, 150-230 Å in size, with a ferromagnetic (or superparamagnetic) Fe-rich core and nonmagnetic Cr-rich superconducting shell. Here we show that due to the intensification of concentration phase separation in the Fe-Cr clusters under ion (Ar(+)) irradiation, the volume of the superconducting phase increases from the initial 0.4-0.5% up to 7-8%. After irradiation, the resistivity jump Δρ/ρ in the temperature range T=3.1-3.6 K increases ∼14 times, reaching 19%, as compared to 1.36% for the initial sample. In the interval of T=3.1-3.6 K, the rate of resistance change reaches 79% K(-1) for the irradiated sample instead of 3.6% K(-1) for the initial sample. In the same temperature interval, the rate of magnetoresistance change increases from 3% K(-1) for the initial sample up to 70% K(-1) after irradiation.
authors.affiliation: Donetsk Physiko-Technical Institute, Ukrainian National Academy of Sciences, 83114 Donetsk, Ukraine. okunev@mail.fti.ac.donetsk.ua
authors.forename: V D
authors.initials: VD
authors.lastname: Okunev
authors.forename: Z A
authors.initials: ZA
authors.lastname: Samoilenko
authors.forename: A
authors.initials: A
authors.lastname: Szewczyk
authors.forename: R
authors.initials: R
authors.lastname: Szymczak
authors.forename: H
authors.initials: H
authors.lastname: Szymczak
authors.forename: S J
authors.initials: SJ
authors.lastname: Lewandowski
authors.forename: P
authors.initials: P
authors.lastname: Aleshkevych
authors.forename: J
authors.initials: J
authors.lastname: Więckowski
authors.forename: V S
authors.initials: VS
authors.lastname: Khmelevskaya
authors.forename: I A
authors.initials: IA
authors.lastname: Antoshina