Partial spin freezing in the quasi-two-dimensional La2(Cu,Li)O4
Y. Chen, Wei Bao, Y. Qiu, J.E. Lorenzo, J.L. Sarrao, D.L. Ho, Min Y., Lin
TL;DR
This study reveals partial spin freezing in La2(Cu,Li)O4, where some spins freeze into a spin-glass state while others remain spin-liquid, due to the interplay of anisotropic interactions, disorder, and quantum fluctuations.
Contribution
It demonstrates a novel partial spin freezing phenomenon in a quasi-two-dimensional Heisenberg system, highlighting the role of anisotropy and quantum effects.
Findings
Partial spin freezing observed in La2(Cu,Li)O4
Remaining spins stay in a spin-liquid state at low temperature
The phenomenon results from a balance of disorder and quantum fluctuations
Abstract
In conventional spin glasses, the magnetic interaction is not strongly anisotropic and the entire spin system freezes at low temperature. In La2(Cu,Li)O4, for which the in-plane exchange interaction dominates the interplane one, only a fraction of spins with antiferromagnetic correlations extending to neighboring planes become spin-glass. The remaining spins with only in-plane antiferromagnetic correlations remain spin-liquid at low temperature. Such a novel partial spin freezing out of a spin-liquid observed in this cold neutron scattering study is likely due to a delicate balance between disorder and quantum fluctuations in the quasi-two dimensional S=1/2 Heisenberg system.
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