Abstract
Rare-earth nickelates Ln{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5}, Ln = Nd and Dy, and Dy{sub 2-x} Y{sub x} Ba Ni O{sub 5} 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{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 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 Nd{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5} decreases continuously with increase in x up to x=0.3 (T{sub N} = 18 K); when x > 0.3, the materials are paramagnetic down to 20 K. The effective magnetic moment ({mu} eff) in Nd{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5} essentially corresponds to the contribution of the Nd ions. In Dy{sub 2-x} Y{sub x} Ba Ni O{sub 5}, the Neel temperature decreases from 40 K when x=0.0 to 24 K when x=1.5. The compositions with 1.5{<=}x<2 (including the x=1.95 composition) are paramagnetic down to 20 K, unlike Y{sub 2} Ba Ni O{sub 5} (x=2.0) which exhibits a T{sub N} of 370 K. Even the smallest concentration of paramagnetic
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Gundakaram, R;
[1]
Vasanthacharya, Y;
[2]
Ganguli, A K;
Rao, C N.R.
[3]
- Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India)
- Indian Inst. of Science, Bangalore (India). Solid State and Structural Chemistry Unit
- Indian Inst. of Science, Bangalore (India)
Citation Formats
Gundakaram, R, Vasanthacharya, Y, Ganguli, A K, and Rao, C N.R.
Magnetic properties of rare earth nickelates for the Ln{sub 2} Ba Ni O{sub 5} family.
France: N. p.,
1996.
Web.
Gundakaram, R, Vasanthacharya, Y, Ganguli, A K, & Rao, C N.R.
Magnetic properties of rare earth nickelates for the Ln{sub 2} Ba Ni O{sub 5} family.
France.
Gundakaram, R, Vasanthacharya, Y, Ganguli, A K, and Rao, C N.R.
1996.
"Magnetic properties of rare earth nickelates for the Ln{sub 2} Ba Ni O{sub 5} family."
France.
@misc{etde_373083,
title = {Magnetic properties of rare earth nickelates for the Ln{sub 2} Ba Ni O{sub 5} family}
author = {Gundakaram, R, Vasanthacharya, Y, Ganguli, A K, and Rao, C N.R.}
abstractNote = {Rare-earth nickelates Ln{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5}, Ln = Nd and Dy, and Dy{sub 2-x} Y{sub x} Ba Ni O{sub 5} 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{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 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 Nd{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5} decreases continuously with increase in x up to x=0.3 (T{sub N} = 18 K); when x > 0.3, the materials are paramagnetic down to 20 K. The effective magnetic moment ({mu} eff) in Nd{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5} essentially corresponds to the contribution of the Nd ions. In Dy{sub 2-x} Y{sub x} Ba Ni O{sub 5}, the Neel temperature decreases from 40 K when x=0.0 to 24 K when x=1.5. The compositions with 1.5{<=}x<2 (including the x=1.95 composition) are paramagnetic down to 20 K, unlike Y{sub 2} Ba Ni O{sub 5} (x=2.0) which exhibits a T{sub N} of 370 K. Even the smallest concentration of paramagnetic Dy seems to destroy the antiferromagnetic Ni-O-Ni chains in Y{sub 2} Ba Ni O{sub 5}. (authors). 10 refs., 7 figs., 1 tab.}
journal = []
issue = {1}
volume = {33}
journal type = {AC}
place = {France}
year = {1996}
month = {Oct}
}
title = {Magnetic properties of rare earth nickelates for the Ln{sub 2} Ba Ni O{sub 5} family}
author = {Gundakaram, R, Vasanthacharya, Y, Ganguli, A K, and Rao, C N.R.}
abstractNote = {Rare-earth nickelates Ln{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5}, Ln = Nd and Dy, and Dy{sub 2-x} Y{sub x} Ba Ni O{sub 5} 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{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 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 Nd{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5} decreases continuously with increase in x up to x=0.3 (T{sub N} = 18 K); when x > 0.3, the materials are paramagnetic down to 20 K. The effective magnetic moment ({mu} eff) in Nd{sub 2} Ba Ni{sub 1-x} Cu{sub x} O{sub 5} essentially corresponds to the contribution of the Nd ions. In Dy{sub 2-x} Y{sub x} Ba Ni O{sub 5}, the Neel temperature decreases from 40 K when x=0.0 to 24 K when x=1.5. The compositions with 1.5{<=}x<2 (including the x=1.95 composition) are paramagnetic down to 20 K, unlike Y{sub 2} Ba Ni O{sub 5} (x=2.0) which exhibits a T{sub N} of 370 K. Even the smallest concentration of paramagnetic Dy seems to destroy the antiferromagnetic Ni-O-Ni chains in Y{sub 2} Ba Ni O{sub 5}. (authors). 10 refs., 7 figs., 1 tab.}
journal = []
issue = {1}
volume = {33}
journal type = {AC}
place = {France}
year = {1996}
month = {Oct}
}