Antiferromagnetic phase transition in Bi2Sr2YCu2O8.37
1989; Elsevier BV; Volume: 160; Issue: 2 Linguagem: Inglês
10.1016/0921-4534(89)90182-2
ISSN1873-2143
AutoresY. Kimishima, Hideyoshi Kittaka,
Tópico(s)Theoretical and Computational Physics
ResumoThe antiferromagnetic (AF) phase transition of Bi2Sr2YCu2O8.37 was investigated by DC magnetic susceptibility (χAF) and magnetic specific heat (Cmag) measurements. From the temperature dependence of χAF, the exchange interaction J/kB between Cu2+-spins was derived as about 770 K and the AF transition temperature TN was obtained as about 340 K from the inflection point of χAF; in the Cmag data, an anomaly appeared at about 330 K, and magnetic entropy was estimated as 5.89 J/(mol-Cu2+ K) from Cmag/T vs. T-curve. These results show that whole Cu2+ spins of S =12 order into antiferromagnetic state at TN = 330 ≈ 340 K.
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