Neutron Scattering Study of Magnetic Ordering in CuFe0.95Al0.05O2

Yasuaki Oohara; Mamoru Mekata; Tsuyoshi Morishita; Kazuhisa Kakurai; Masakazu Nishi; Tong-Rong Zhao; Humihiko Takei

doi:10.1143/jpsj.70.3031

Neutron Scattering Study of Magnetic Ordering in CuFe_0.95Al_0.05O₂

Yasuaki Oohara, Mamoru Mekata, Tsuyoshi Morishita, Kazuhisa Kakurai, Masakazu Nishi, Tong-Rong Zhao, Humihiko Takei

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Keywords: neutron diffraction, neutron spin-echo, CuFeO₂, CuFe_0.95Al_0.05O₂, frustration

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2001 Volume 70 Issue 10 Pages 3031-3036

DOI https://doi.org/10.1143/jpsj.70.3031

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Abstract

Magnetic ordering of CuFe_0.95Al_0.05O₂ was studied by neutron scattering. CuFe_0.95Al_0.05O₂ exhibits a quasi-long-range order below a pseudo-Néel temperature, T_N=13.5 K. The magnetic structure is a helical structure with the propagation vector (0.196 0.196 3/2). However, a true long-range order is not established even at 1.7 K. Neutron spin-echo measurements revealed that the ordered magnetic moment becomes static below T_N. The existence of the helical structure suggests that an Ising anisotropy of CuFeO₂ is weak.

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