Contribution of degenerate molecular orbitals to molecular orbital angular momentum in molecular magnet Fe(Pc)(CN)2

• Published in: Journal of the Physical Society of Japan 2003-12, Vol.72 (12), p.3226-3230
• Main Authors: HANASAKI, N, MATSUDA, M, TAJIMA, H, NAITO, T, INABE, T
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron paramagnetic resonance and relaxation; Exact sciences and technology; Magnetic properties and materials; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Magnetically ordered materials: other intrinsic properties; Molecular magnets; Physics; Saturation moments and magnetic susceptibilities; Studies of specific magnetic materials
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/jpsj.72.3226

We measured the static magnetic susceptibility and the electron spin resonance of the Fe(Pc)(CN)2 complexes, and investigated the molecular magnetism of the unit Fe(Pc)(CN)2. The magnetic susceptibility shows a highly anisotropic Curie behavior. Based on the electron spin resonance, we found a highly anisotropic g-value (g1=3.62, g2=1.11, and g3=0.52) in the molecular unit Fe(Pc)(CN)2. This anisotropy is caused by the molecular orbital angular momentum in the degenerate next highest occupied molecular orbitals of the molecular unit Fe(Pc)(CN)2. Since the molecular unit Fe(Pc)(CN)2 has a unique structure with fourfold symmetry, the molecular orbital angular momentum has a finite value of lz∼+1 and -1. The anisotropic molecular magnetism of the unit Fe(Pc)(CN)2 contributes the highly anisotropic Curie behavior. The molecular unit Fe(Pc)(CN)2 is a good candidate for a molecular magnet having high magnetic anisotropy.