Leithe-Jasper A, Schnelle W, Rosner H, Senthilkumaran N, Rabis A, Baenitz M, Gippius A, Morozova E, Mydosh J A, Grin Y
Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, 01187 Dresden, Germany.
Phys Rev Lett. 2003 Jul 18;91(3):037208. doi: 10.1103/PhysRevLett.91.037208.
New alkali-metal compounds with the filled-skutterudite structure were synthesized and their chemical and physical properties investigated. X-ray diffraction, microprobe, and chemical analysis established the structure and the composition without defects on the cation site. Magnetization, ac susceptibility, specific heat, resistivity, and NMR or NQR demonstrated NaFe4Sb12 to be ferromagnetic below approximately 85 K and to exhibit an additional magnetic anomaly around 40 K. Band structure calculations find a large density of states at the Fermi energy and a ferromagnetic ground state. Similar behavior was observed for KFe4Sb12.
合成了具有填满型方钴矿结构的新型碱金属化合物，并对其化学和物理性质进行了研究。X射线衍射、微探针和化学分析确定了结构和组成，阳离子位点无缺陷。磁化强度、交流磁化率、比热、电阻率以及核磁共振或核四极共振表明，NaFe4Sb12在约85 K以下呈铁磁性，在40 K左右表现出额外的磁异常。能带结构计算发现在费米能量处有很大的态密度和铁磁基态。KFe4Sb12也观察到类似行为。
