Experimental Observation of the Crystallization of a Paired Holon State

Abstract

A new excitation is observed at 201 meV in the doped-hole ladder cuprate Sr14Cu24O41, using ultraviolet resonance Raman scattering with incident light at 3.7 eV polarized along the direction of the rungs. The excitation is found to be of charge nature, with a temperature independent excitation energy, and can be understood via an intra-ladder pair-breaking process. The intensity tracks closely the order parameter of the charge density wave in the ladder (CDWL), but persists above the CDWL transition temperature (TCDW L ), indicating a strong local pairing above TCDW L . The 201 meV excitation vanishes in La6Ca8Cu24O 41+δ , and La5Ca9Cu24O41 which are samples with no holes in the ladders. Our results suggest that the doped holes in the ladder are composite bosons consisting of paired holons that order below TCDW .

Electronic Screening-Enhanced Hole Pairing in Two-Leg Spin Ladders Studied by High-Resolution Resonant Inelastic X-Ray Scattering at CuMEdges

“…In contrast, the Cu-4p orbitals reside well above the Fermi level and hybridize with the O-3p orbitals, thus allowing the coupling of photons to oxygen related phonons at the M 1 edge [see also Fig resonance profile at the Cu-M 1 edge with a resonance energy of 122.5 eV. For increasing incident photon energies, we observe the development of one-phonon scattering from oxygen modes below 100 meV Raman shift also in agreement with visible Raman scattering [13,27]. As reference, for Si, we only observe elastic contributions.…”

“…They contain the basic physics given by the competition between the kinetic energy determined by the hopping matrix elements t, the electron-electron interaction (or electronic correlation) energies driven by on-site Coulomb repulsions, and superexchange energies J. Indeed, SLCs show striking properties: superconductivity under high pressure [5], a gapped spin-liquid state [6], charge-density waves [7][8][9][10][11], as well as a paired-hole state [12,13]. This rich physics is a result of competing energy scales that foster a large number of nearly degenerate ground states [13][14][15][16][17].…”

“…All RIXS spectra were corrected to the FLASH intensity. The samples were characterized using resonant soft x-ray scattering, x-ray absorption [9,11,12], and UV-Raman spectroscopy [13]. More details on the RIXS measurements are shown in the Supplemental Material [18].…”

Momentum-space electronic structures and charge orders of the high-temperature superconductors Ca2−xNaxCuOMeng1, Brunner2, Kim3 et al. 2011Phys. Rev. B20240View full textAdd to dashboardCite

“…In electron-correlation-based scenarios, the checkerboard periodicity has been shown dopingindependent [21], as in Na-CCOC, or an argument based on the domain size has been given [22] to explain the small doping dependence seen in Bi2212. In closing, we note that similar strong correlation-based charge order scenarios have been proposed recently for quasi-onedimensional cuprates [38] and La based superconductors [39] …”

Unraveling local spin polarization of Zhang-Rice singlet in lightly hole-doped cuprates using high-energy optical conductivity

“…the abrupt reversal of the trend in the spectral weights near T s , which can be explained within MST picture. The stripe correlation hosts an anti-phase boundary of the anti-ferromagnetic correlation across the doped hole [29][30][31][32][33][34]. That is, the Cu atoms on the opposite side of the MST are correlated with opposite spin.…”