Quenching and Recovery of Spin in Quasi-One-dimensional Itinerant Electron Magnet LaMn_4Al_8(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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The electron correlation in the 3d heavy-electron compound with linear spin chains, LaMn_4Al_8, has been investigated. Like a similar compound, YMn_4Al_8, we found a broad maximum in the temperature dependence of the susceptibility. This is interpreted by assuming the presence of a narrow pseudogap with the width △≃280K in the spin excitation spectrum, which leads to the quenching of spin at low temperatures. Anomalies in susceptibility, resistivity and thermal expansion data, observed below approximately 50K in spite of the absence of any phase transition, suggest the recovery of spin and the development of short-range magnetic correlation in this low-temperature range. This is in contrast to the case of YMn_4Al_8. No apparent long-range ordering in spite of the markedly developed magnetic correlation is probably due to the one-dimensional nature of the Mn spin arrangement.
社団法人日本物理学会の論文
2005-04-15