Magnetic Phase Diagram of Ce_xLa_<1-x>B_6 Studied by Static Magnetization Measurement at Very Low Temperatures

概要

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DC magt'retization of single crystals of Ce.Laj .B6, 0.5< x< l, laave been naeastrred at IOXVtemperattrres (V') down to 40 mK in magnetic field H / [1007, and the II - T - x phase diagranaswere obtained. At zero field, the antiferro-qtradrupolar (AFQ) transition temperature Tc) rapidlydecreases xvith decreasing x and vanishes abruptly between x :: 0.75 and 0.7. The Neel teztaper-attnre Tw, which is loxver than Tc) in CeBc;, varies more sloxvly with x and exceeds Tc) for x >0.8.A clear peak observed in the susceptibility strongly suggests that a new antiferromagnetic (AF)state having no AFQ moment (phase IV) exists for 0.8 >x >0.5, in addition to the two orderedphases II (AFQ) and III (AF-fAFQ). As H increases, a first-order phase TV-III transition isobserved with a metamagnetic jtrnnp in the unagnetization. Strccessive I (paranaagnetic)-TV-IIIphase transitions are observable in a very narroxv region of the H - T - x space.
社団法人日本物理学会の論文
1997-08-15