Antiferromagnetic order in Li(Ni1-xFex)PO4 (x=0.06, 0.20)

TitleAntiferromagnetic order in Li(Ni1-xFex)PO4 (x=0.06, 0.20)
Publication TypeJournal Article
Year of Publication2013
AuthorsZimmermann AS, Sondermann E, Li JY, Vaknin D, Fiebig M
Journal TitlePhysical Review B
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000322083400002
Keywords2nd-harmonic generation, domains, licopo4, lifepo4, limnpo4, linipo4, weak ferromagnetism

The investigation of Li(Ni1-xFex)PO4 by optical second harmonic generation yields the competition of the antiferromagnetic (AFM) structures and 180 degrees domain patterns found in the end compounds LiNiPO4 (point group mm'm, spins along z) and LiFePO4 (point group mmm', spins along y). While the AFM order and the distribution of the AFM domains of LiNiPO4 are unaffected by the ion substitution at x = 0.06, striking changes are observed at x = 0.20. Fe2+ is dominant in establishing the magnetic order. For x = 0.20 the magnetic order of the solid solution interpolates the magnetic order of its end compounds by exhibiting an orientation of the spins in the (100) plane which include an angle of 40 degrees +/- 3 degrees with respect to the y axis toward 0 K (point group m). The associated AFM domains form rods of a few millimeters length and similar to 10 mu m width occurring in neither of the end compounds. Mechanisms responsible for the magnetic order and domain pattern (180 degrees domains still being one of the least explored aspects of AFM materials in spite of their omnipresence) are discussed.

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