Confirmation of antiferromagnetism in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">La</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span><span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">CuO</mi></mrow><mrow><mn>4</mn><mi mathvariant="normal">−</mi><mi mathvariant="normal">y</mi></mrow></msub></mrow></math></span> with polarized neutrons

S. Mitsuda; G. Shirane; S. K. Sinha; D. C. Johnston; M. S. Alvarez; D. Vaknin; D. E. Moncton

doi:10.1103/PhysRevB.36.822

Rapid Communication

Confirmation of antiferromagnetism in ${La}_{2}$ ${CuO}_{4 - y}$ with polarized neutrons

S. Mitsuda, G. Shirane, S. K. Sinha, D. C. Johnston, M. S. Alvarez, D. Vaknin, and D. E. Moncton

Phys. Rev. B 36, 822(R) – Published 1 July 1987

Abstract

We have used neutron polarization analysis to study the superlattice peaks observed recently in undoped ${La}_{2}$ ${CuO}_{4 - y}$ using unpolarized powder neutron diffraction. The results confirm that the superlattice peaks are indeed due to antiferromagnetic ordering, which occurs for our sample below $T_{N}$ =290±30 K, in agreement with our magnetic susceptibility data which yield $T_{N}$ =290±10 K. The low-temperature moment on the Cu ion is estimated as 0.43±0.13 $μ_{B}$ in agreement with the previous estimates.