Neutron-Diffraction Determination of Antiferromagnetic Structure of Cu Ions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>x</mml:mi><mml:mo>=</mml:mo><mml:mn>0.0</mml:mn><mml:mn/><mml:mi> </mml:mi><mml:mi mathvariant="normal">and</mml:mi><mml:mi> </mml:mi><mml:mn>0.15</mml:mn></mml:math>
J. M. Tranquada(Brookhaven National Laboratory), D. E. Cox(Brookhaven National Laboratory), W. Kunnmann(Brookhaven National Laboratory), H. Moudden(Brookhaven National Laboratory), G. Shirane(Brookhaven National Laboratory), M. Suenaga(Brookhaven National Laboratory), Peter Zolliker(Brookhaven National Laboratory), David Vaknin(Brookhaven National Laboratory), S. K. Sinha(Brookhaven National Laboratory), M. S. Alvarez(Brookhaven National Laboratory), Allan J. Jacobson(Brookhaven National Laboratory), D. C. Johnston(Brookhaven National Laboratory)
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Abstract
Neutron-diffraction experiments on ceramic powders of $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6+x}$ (nonsuperconducting, with $x=0.0 \mathrm{and} 0.15$ have confirmed the existence of long-range, three-dimensional, antiferromagnetic order of the Cu spins. The structure determination was aided by the use of uniaxially oriented powders. The ordering wave vector within a Cu${\mathrm{O}}_{2}$ plane is (\textonehalf{} \textonehalf{}) and the planes are coupled antiferromagnetically along the $c$ axis. The N\'eel temperature is 400\ifmmode\pm\else\textpm\fi{}10 K for the $x=0.15\ifmmode\pm\else\textpm\fi{}0.05$ sample and \ensuremath{\gtrsim}500 K for $x=0.0$.
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