1. Electrical and magnetic properties of LnOZnPn (Ln=rare earths; Pn=P, As, Sb)
- Author
-
Yoshiki Takano, Y. Takahashi, Hiroyuki Komasaki, Satoshi Komatsuzaki, Tadataka Watanabe, and Kouichi Takase
- Subjects
Condensed matter physics ,Magnetic moment ,Chemistry ,Mechanical Engineering ,Metals and Alloys ,Analytical chemistry ,Magnetic susceptibility ,Ion ,Paramagnetism ,Mechanics of Materials ,Electrical resistivity and conductivity ,Materials Chemistry ,Diamagnetism ,Atomic number ,Pnictogen - Abstract
Electrical and magnetic properties of oxypnictides LnOZnPn (Ln = rare earths, Pn = pnictogen elements) with a ZrCuSiAs structure are investigated. The electrical resistivity of LnOZnPn decreases with an atomic number of Pn. The electrical resistivity has a maximum at Ln = Ce and then decreases with an atomic number of Ln in LnOZnAs, and it decreases with an atomic number of Ln in LnOZnSb. While LnOZnPn (Ln = La, Ce, Pr, Pn = P, As) are semiconducting, LnOZnSb (Ln = La, Ce) show a metal–semiconductor transition and NdOZnPn (Pn = As, Sb) become metallic. While LaOZnPn shows a diamagnetism, other LnOZnPn are paramagnetic. The effective magnetic moment μ eff deviates from the trivalent free ion values with an atomic number of Pn and Ln. The correlation between the deviation of μ eff and the decrease of the electrical resistivity suggests that 4f electrons contribute to the electrical conduction.
- Published
- 2008
- Full Text
- View/download PDF