Hidden order in the cuprates
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In this paper, the enigmatic pseudogap phase of cuprate superconductors is characterized by a hidden broken symmetry of ${d}_{{x}^{2}\ensuremath{-}{y}^{ 2}}$-type.Citations
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Incipient loop-current order in the underdoped cuprate superconductors
Abstract: There is growing experimental evidence that indicates discrete symmetry-breaking-like time-reversal ($\mathcal{T}$), parity ($\mathcal{P}$), and ${C}_{4}$ lattice rotation in the pseudogap state of underdoped copper-oxide-based (cuprate) superconductors. The discrete symmetry breaking manifests a true phase transition to an ordered state. A detailed thermodynamic understanding of these orders can answer various puzzles related to the nature of the transition at the pseudogap temperature ${T}^{*}$. In this work, we investigate the thermodynamic signature of $\mathcal{T}\mathcal{\text{\ensuremath{-}}}\mathcal{P}$ symmetry breaking considering superconductivity (SC) and bond-density wave (BDW) as two primary orders. The BDW can generate both modulating charge and current densities. This framework takes into account an intricate competition between the ubiquitous charge density wave and SC, which is prominent in various cuprates in the underdoped regime. We demonstrate that within the mean-field approach of competing BDW and SC orders, a $\mathcal{T}\mathcal{\text{\ensuremath{-}}}\mathcal{P}$ breaking ground state of coexisting BDW and SC can be stabilized, provided the BDW itself breaks $\mathcal{T}\text{\ensuremath{-}}\mathcal{P}$. But this ground state ceases to occur at higher temperatures. However, we show that fluctuations in SC and BDW can bring about the emergence of an unusual translational symmetry preserving order due to a preemptive phase transition by spontaneously breaking $\mathcal{T}\mathcal{\text{\ensuremath{-}}}\mathcal{P}$ at a higher temperature before the primary orders set in. We refer to this order as magnetoelectric loop current (MELC) order. We present the possible nature of the phase transition for this incipient MELC order and discuss some experimental relevance.
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Phase diagram of the three-band half-filled Cu-O two-leg ladder
TL;DR: In this article, the phase diagram of the half-filled two-leg ladder at weak and strong coupling was determined, taking into account the Cu d(x)(2)-y(2) and the O p(x) and p(y) orbitals.
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Coexistence of the Pseudogap and the Superconducting Gap Revealed by the \textit{c}-axis Optical Study of YBa$_{2}$(Cu$_{1-x}$Zn$_{x}$)$_{3}$O$_{7-\delta}$
TL;DR: In this article, the authors studied the spectral weight transfer to the high energy region of the pseudogap in the high temperature superconducting cuprates with underdoped YBa and Zn substituted samples.
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Spin zeros and the origin of Fermi-surface reconstruction in the cuprates.
Michael R. Norman,Jie Lin +1 more
TL;DR: In this article, it was shown that the lack of spin zeros reported in one of the experiments is consistent with either hole or electron pockets in such a state, if the staggered moment is perpendicular to the external field.
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Revival of Charge Density Waves and Charge Density Fluctuations in Cuprate High-Temperature Superconductors
TL;DR: In this article, a short memory of my scientific contacts with K.A. Muller starting from the Interlaken Conference (1988), Erice (1992 and 1993), and Cottbus (1994) on the initial studies on phase separation (PS) and charge inhomogeneity in cuprates carried out against the view of the majority of the scientific community at that time.
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