Synthesis, crystal structure, transport and magnetic properties of novel ternary copper phosphides, A2Cu6P5 (A = Sr, Eu) and EuCu4P3статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Three new ternary copper phosphides, Sr2Cu6P5, Eu2Cu6P5,
and EuCu4P3, have been synthesized from the elements in evacuated silica
capsules. Eu2Cu6P5 and Sr2Cu6P5 adopt the Ca2Cu6P5-type structure, while
EuCu4P3 is isostructural to BaMg4Si3 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 Eu2Cu6P5 and
EuCu4P3, long-range magnetic order was observed, governed by 4f local
moments on the Eu atoms with predominant ferromagnetic interactions.
While Eu2Cu6P5 shows a single ferromagnetic transition at TC = 34 K, the
magnetic behavior of EuCu4P3 is more complex, giving rise to three
consecutive magnetic phase transitions at 70, 43, and 18 K.