Spontaneous Magnetization and Antiferromagnetic Correlations of the $CuO_{2}$ Chains in $Sr_{0.73} CuO_{2}$

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20 April 1998

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 80 (16) , 3626-3629
https://doi.org/10.1103/physrevlett.80.3626

Abstract

We have studied magnetic properties of the novel quasi-one-dimensional cuprate

Sr_{0.73} CuO_{2}

, containing edge-sharing

CuO_{2}

chains. This compound can be described as an alternating-chain Heisenberg antiferromagnet. The

CuO_{2}

chains are hole doped with a high hole concentration

(\sim 0.6 / CuO_{2})

, and each hole renders the

CuO_{2}

unit nonmagnetic. The experiments reveal that

Sr_{0.73} CuO_{2}

develops a long-range magnetic order at 12 K with a small spontaneous ferromagnetic moment

M_{s} = 3.2 (2) \times 10^{- 3} μ_{B} / Cu

. The observation of long-range magnetic order in

CuO_{2}

chains doped with a substantial number of holes is very surprising.

Keywords

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