title: Synthesis, crystal structure, transport, and magnetic properties of novel ternary copper phosphides, A2Cu6P5 (A = Sr, Eu) and EuCu4P3.
abstract: Three new ternary copper phosphides, Sr(2)Cu(6)P(5), Eu(2)Cu(6)P(5), and EuCu(4)P(3), have been synthesized from the elements in evacuated silica capsules. Eu(2)Cu(6)P(5) and Sr(2)Cu(6)P(5) adopt the Ca(2)Cu(6)P(5)-type structure, while EuCu(4)P(3) is isostructural to BaMg(4)Si(3) and still remains the only representative of this structure type among the ternary Cu pnictides. All three materials show metallic conductivity in the temperature range 2 K ≤ T ≤ 290 K, with no indication for superconductivity. For Eu(2)Cu(6)P(5) and EuCu(4)P(3), long-range magnetic order was observed, governed by 4f local moments on the Eu atoms with predominant ferromagnetic interactions. While Eu(2)Cu(6)P(5) shows a single ferromagnetic transition at T(C) = 34 K, the magnetic behavior of EuCu(4)P(3) is more complex, giving rise to three consecutive magnetic phase transitions at 70, 43, and 18 K.
authors: Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia. charkin@inorg.chem.msu.ru
authors: Dmitri O
authors: DO
authors: Charkin
authors: Arthur V
authors: AV
authors: Urmanov
authors: Sergey M
authors: SM
authors: Kazakov
authors: Dmitri
authors: D
authors: Batuk
authors: Artem M
authors: AM
authors: Abakumov
authors: Stephan
authors: S
authors: Knöner
authors: Elena
authors: E
authors: Gati
authors: Bernd
authors: B
authors: Wolf
authors: Michael
authors: M
authors: Lang
authors: Andrey V
authors: AV
authors: Shevelkov
authors: Gustaaf
authors: G
authors: Van Tendeloo
authors: Evgeni V
authors: EV
authors: Antipov