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Phase Diagram and Eu Valence State in EuPtP1−xAsx
Masaki Sugishima,Akihiro Mitsuda,Hirofumi Wada,Masahiko Isobe,Yutaka Ueda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
EuPtP is known to exhibit two valence ordering transitions, one at T1 = 235 K and the other atT2 = 190 K. For T > T1, the Eu ions are in the valence fluctuating state. For T2 < T < T1, the Euvalence state is ordered along the c-axis with the sequence of Eu2+-Eu2+-Eu3+-Eu2+-Eu2+-Eu3+. Moreover, the stacking is replaced by another sequence of Eu2+-Eu3+-Eu2+-Eu3+ at temperaturesbelow T2. The substitution of As for P expands the lattice and decreases both T1 and T2. Inthis paper, we report the magnetic susceptibility and electrical resistivity of EuPtP1−xAsx singlecrystals. We observed two valence ordering transitions for 0 ≤ x ≤ 0.4, while a single valenceordering transition was detected for 0.55 ≤ x ≤ 0.6. No valence ordering transitions were observedfor x = 0.7 down to the lowest temperature. Based on the experimental results, we present thephase diagram of EuPtP1−xAsx and discuss the Eu valence state in this system.