Abstract
In the search for mechanisms of high-temperature superconductivity it is critical to know the electronic spectrum in the pseudogap phase from which superconductivity evolves. The lack of angle-resolved photoemission data for every cuprate family precludes an agreement as to its structure, doping and temperature dependence and the role of charge ordering. Here we show that, in the entire Fermi-liquid-like regime that is ubiquitous in underdoped cuprates, the spectrum consists of holes on the Fermi arcs and an electronic pocket. We argue that experiments on the Hall coefficient identify the latter as a permanent feature at doped hole concentration x > 0.08–0.10, in contrast to the idea of the Fermi surface reconstruction via charge ordering. The longstanding issue of the origin of the negative Hall coefficient in YBCO and Hg1201 at low temperature is resolved: the electronic contribution prevails as mobility of the latter (evaluated by the Dingle temperature) becomes temperature independent, while the mobility of holes scattered by the short-wavelength charge density waves decreases.
Highlights
Two-component energy spectrum of cuprates in the pseudogap phase and its evolution with temperature and at charge ordering
We show that at doped hole concentrations x . 0.08–0.10 the experimental Hall coefficient identifies the pocket as a permanent feature, in contrast to the idea of Fermi surface (FS) reconstruction at the charge ordering phase transition
As pointed out in Introduction, no consensus yet exists concerning many of the enigmatic properties of the pseudogap phase (PG) which directly concerns the spectrum of the elementary excitations in UD cuprates
Summary
In the search for mechanisms of high-temperature superconductivity it is critical to know the electronic spectrum in the pseudogap phase from which superconductivity evolves. 0.08–0.10 the experimental Hall coefficient identifies the pocket as a permanent feature, in contrast to the idea of FS reconstruction at the charge ordering phase transition It was found[16] that below a temperature T**(x) (TS , T , T**(x) , T*(x) with T* and TS being the PG and superconducting transition temperatures respectively) in the phase diagram of underdoped (UD) cuprates there exists a broad region in temperature and doping level in which resistivity displays a quadratic temperature dependence similar to that in a Fermi liquid. The role of electron pocket is further discussed in the light of recent experiments revealing the onset of a charge density order at low temperatures[8,9,10,11,12]
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