Magnetic properties of rare earth nickelates of the Ln(2)BaNiO(5) family

Gundakaram, R. ; Vasanthacharya, N. Y. ; Ganguli, A. K. ; Rao, C. N. R. (2011) Magnetic properties of rare earth nickelates of the Ln(2)BaNiO(5) family European Journal of Solid State and Inorganic Chemistry, 33 (1). pp. 41-52. ISSN 0992-4361

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Rare-earth nickelates Ln(2)BaNi(1-x)Cu(2)O(5), Ln = Nd and Dy, and Dy2-xY&xBaNiO5 have been synthesized in order to investigate the effect of substitution of Ni by Cu and Dy by nonmagnetic Y on the magnetic properties of the nickelates. In Ln(2)BaNi(1-x)Cu(x)O(5), the nickelate structure (x=0.0) changes to the cuprate structure (x=1.0) at a specific composition (x=0.3). The Neel temperature of Nd2BaNi1-xCuxO5 decreases continuously with increase in x upto x=0.3 (T-N = 18K); when x > 0.3, the materials are paramagnetic down to 20K. The mu(eff) in Nd2BaNi1-xCxO5 essentially corresponds to the contribution of the Nd ions. In Dy2-xYxBaNiO5, the Neel temperature decreases from 40K when x=0.0 to 24K when x=1.5. The compositions with 1.5 less than or equal to x less than or equal to 2 (including the x=1.95 composition) are paramagnetic down to 20K, unlike Y2BaNiO5 (x=2.0) which exhibits a T-N of 370K. Even the smallest concentration of paramagnetic Dy seems to destroy the antiferromagnetic Ni-O-Ni chains in Y2BaNiO5.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:62042
Deposited On:16 Sep 2011 04:01
Last Modified:16 Sep 2011 04:01

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