Déviations à la loi de Curie-Weiss dans les composés cuivriques

Abstract

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Copper(II) Complexes with Subnormal Magnetic Moments

“…The simplest case may be represented by CuO with a subnormal magnetic moment of 0.78 B.M. (155). Its structure is shown schematically below (175,188a).…”

“…In 1956, exact measurements of the temperature variation of the magnetic susceptibilities of anhydrous and hydrated copper(II) acetates were performed by Figgis and Martin (45) and Perakis (155) for the pur- . , .…”

Observation of Charge Stripes in Cupric Oxide

“…The former is similar to planar-coordinated Cu as in YBa 2 Cu 3 O 7 and the latter can be compared with the ladder-structure superconductors that are composed of parallel one-dimensional chains of copper and oxygen atoms [17,18]. CuO is shown to undergo long-range antiferromagnetic transition at T N1 230 K followed by an incommensurate to commensurate transition with spin reorientation at T N2 213 K, and strong short-range AF interactions well above T N [19][20][21][22][23][24][25][26][27][28]. The amplitude of the calorimetric transition is small, the entropy loss below T N is only 31% of R ln2, and the short-range order contribution above T N is large.…”

The crystal structures and magnetic properties of some red cupric chloride complexes

“…Magnetic susceptibility measurements on CuClg (24,25,26) in the range 17-300°K showed an antiferromagnetic transition at about 70°K with = 2.01 and 8 = -93°K in the paramagnetic region. The extrapolation of the data in the paramagnetic region was extremely difficult, however, due to the curvature of the 1/X versus T plot.…”