Superstripes and Complexity in High-Temperature Superconductors

Abstract

While for many years the lattice, electronic and magnetic complexity of hightemperature superconductors (HTS) has been considered responsible for hindering the search of the mechanism of HTS now the complexity of HTS is proposed to be essential for the quantum mechanism raising the superconducting critical temperature. The complexity is shown by the lattice heterogeneous architecture: a) heterostructures at atomic limit; b) electronic heterogeneity: multiple components in the normal phase; c) superconducting heterogeneity: multiple superconducting gaps in different points of the real space and of the momentum space. The complex phase separation forms an unconventional granular superconductor in a landscape of nanoscale superconducting striped droplets which is called the "superstripes" scenario. The interplay and competition between magnetic orbital charge and lattice fluctuations seems to be essential for the quantum mechanism that suppresses thermal decoherence effects at an optimum inhomogeneity.

Spatially Resolved Ferroelectric Domain-Switching-Controlled Magnetism in Co40Fe40B20/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 Multiferroic Heterostructure

“…1–4 For example, it is believed to be one of the key issues to understand the mechanisms of high-temperature superconductivity in cup-rates 4,5 and colossal magnetoresistance in manganites. 2,3 Spatially resolved techniques have provided important information for understanding the phenomena of intrinsic spatial inhomogeneity or phase separation, 4,6–8 which exists in many systems.…”

“…2,3 Spatially resolved techniques have provided important information for understanding the phenomena of intrinsic spatial inhomogeneity or phase separation, 4,6–8 which exists in many systems. 1–5 In multiferroic materials, the coupling between ferroelectric (FE) and ferromagnetic (FM) orders also gives rise to intrinsic spatial inhomogeneity due to the complexity of the FE (domain structure and domain switching) that is coupled to the FM. Moreover, multiferroic materials provide an avenue to electric field control of magnetism and have been extensively studied because electric field control of magnetism at room temperature is one of the cornerstones of novel electric writing magnetic memories.…”

CDW and Similarity of the Mott Insulator-to-Metal Transition in Cuprates with the Gas-to-Liquid-Liquid Transition in Supercooled Water

“…The characteristic feature of the CDW phase in cuprates is a nanoscale phase separation where below T* nanoscale puddles of CDW coexists with magnetic puddles and below Tc the short range CDW phase competes and coexists with the high temperature superconducting phase. This well accepted complex nanoscale phase separation [78][79] has been called the superstripes scenario [80][81][82] and it has been observed also in doped iron based superconductors [83] and diborides [84]. The coexistence of two different electronic components, phase separation, lattice and electronic complexity and percolation have been predicted by several authors to be essential features for emergente of high tenperature superconductivity [85][86][87][88][89][90][91][92][93][94][95][96][97][98][99].…”

Lifshitz Transitions In Multi-band Hubbard Models for Topological Superconductivity in Complex Quantum Matter

“…The name of the series of stripes conferences changed its name into superstripes conferences in 2008 driven by clear evidence for phase separation in iron based superconductors [22,23]. This decision marked the shift of the scientific interest toward quantum phenomena in complex matter [24][25][26][27][28]. and toward a new paradigm: the multigap superconductivity near electronic topological Lifshitz transitions [29] with pairing in one of the Fermi surface pockets is in the BEC-BCS crossover regime [30] .…”