title: Magnetic ordering in semiconducting Tl0.53K0.47Fe1.64Se2 single crystals studied by Mössbauer spectroscopy.
abstract: The results of a 57Fe Mössbauer spectroscopy study between 4.5 and 523.2 K and in external magnetic fields (up to 90 kOe) of semiconducting Tl0.53K0.47Fe1.64Se2 single crystals are reported. Evidence is provided for a possible phase separation into the magnetic majority and minority phases. It is demonstrated that the magnetic moments of the divalent Fe atoms located at the 16i site (space group I4/m) of the majority phase and of the minority phase are antiferromagnetically ordered, with the Néel temperature T(N) = 518.0(3.6) K. The magnetic moments at 5.0 K of 2.09(1) and 2.28(2) μ(B) in these two phases are tilted from the crystallographic c axis by 18(1)° and 32(2)°, respectively. The Debye temperature of Tl0.53K0.47Fe1.64Se2 is found to be 228(4) K.
authors.affiliation: Department of Physics, University of Ottawa, Ottawa, ON, Canada. stadnik@uottawa.ca
authors.forename: Zbigniew M
authors.initials: ZM
authors.lastname: Stadnik
authors.forename: Pu
authors.initials: P
authors.lastname: Wang
authors.forename: Jan
authors.initials: J
authors.lastname: Zukrowski
authors.forename: Hang-Dong
authors.initials: HD
authors.lastname: Wang
authors.forename: Chi-Heng
authors.initials: CH
authors.lastname: Dong
authors.forename: Ming-Hu
authors.initials: MH
authors.lastname: Fang