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The most intriguing observation of cuprate experiments is most likely themetal-insulator-crossover (MIC), seen in the underdome region of thetemperature-doping phase diagram of copper-oxides under a strong magneticfield, when the superconductivity is suppressed. This MIC, which results insuch phenomena as heat conductivity downturn, anomalous Lorentz ratio,nonlinear entropy, insulating ground state, nematicity- and stripe-phases andFermi pockets, reveals the nonconventional dielectric property of thepseudogap-normal phase. Since conventional superconductivity appears from aconducting normal phase, the understanding of how superconductivity arises froman insulating state becomes a fundamental problem and thus the keystone for allof cuprate physics. Recently, in interpreting the physics of visualization inscanning tunneling microscopy (STM) real space nanoregions (NRs), which exhibitan energy gap, we have succeeded in understanding that the minimum size forthese NRs provides pseudogap and superconductivity pairs, which are singlebosons. In this work, we discuss the intra-particle magnetic spin and chargefluctuations of these bosons, observed recently in hidden magnetic order andSTM experiments. We find that all the mentioned MIC phenomena can be obtainedin the Coulomb single boson and single fermion two liquid model, which werecently developed, and the MIC is a crossover of sample percolating NRs ofsingle fermions into those of single bosons.

nanosistemy: fizika, himiâ, matematika

Intra pseudogap- and superconductivity-pair spin and charge fluctuations  and underdome metal-insulator (fermion-boson)-crossover phenomena as  keystones of cuprate physics