FL* Interpretation of a Dichotomy in the Spin Susceptibility of the Cuprates

We propose that some dichotomic Fermi liquid versus non-Fermi behaviours of physical quantities in hole-doped cuprates can be explained terms the FL* fractionalized concept, introduced years ago, even beyond region underdoping. The particle excitations this system are holon carrying charge, spinon spin 1/2, gauge fluctuations coupling them and hole as a spinon–holon bound state or resonance due to binding. In our proposal, responses have Fermi-liquid-type behaviour if they dominated by resonance, whereas appears spinon–spinon (and possibly also holon–holon) interactions. specific case susceptibility so-called "strange metal phase" is discussed. uniform turns out hole-dominated, spin-lattice relaxation rate Cu sites spinon-dominated.