Spin Δ_T noise reverses to negative in N-sf-N-I-S junctions from spin-flip scattering and Andreev reflection, unlike always-positive charge Δ_T noise and quantum shot noises.
As far as we know, negative charge∆T noise or negative charge∆T thermal noise contribution for spin-polarised transport has not been seen in any system
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Negative Spin $\Delta_T$ noise Induced by Spin-Flip Scattering and Andreev Reflection
Spin Δ_T noise reverses to negative in N-sf-N-I-S junctions from spin-flip scattering and Andreev reflection, unlike always-positive charge Δ_T noise and quantum shot noises.