Evidence of Spin Density Waves in La_{3}Ni_{2}O_{7-δ}
Kaiwen Chen1, Xiangqi Liu2, Jiachen Jiao1
1State Key Laboratory of Surface Physics, Department of Physics, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200438, China.
Abstract:
The recently discovered superconductivity with critical temperature T_{c} up to 80 K in the double-layer Nickelate La_{3}Ni_{2}O_{7-δ} under pressure has drawn great attention. Here, we report the positive muon spin relaxation (μ^{+}SR) study of polycrystalline La_{3}Ni_{2}O_{6.92} under ambient pressure. Zero-field μ^{+}SR experiments reveal the existence of magnetic order in La_{3}Ni_{2}O_{6.92} with T_{N}=154 K. The weak transverse field μ^{+}SR measurements reveal the bulk nature of magnetism. In addition, a small quantity of oxygen deficiencies can greatly broaden the internal magnetic field distribution sensed by muons.
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