Discovery of Orbital Ordering in Bi2Sr2CaCu2O8+x
arXiv:2302.14855 · doi:10.1038/s41563-024-01817-z
Abstract
The primordial ingredient of cuprate superconductivity is the CuO2 unit cell. Here, theoretical attention usually concentrates on the intra-atom Coulombic interactions dominating the 3d^9 and 3d^10 configurations of each copper ion. However, if Coulombic interactions also occur between electrons of the 2p^6 orbitals of each planar oxygen atom, spontaneous orbital ordering may split their energy levels. This long predicted intra-unit cell symmetry breaking should then generate an orbital ordered phase, for which the charge-transfer energy E separating the 2p^6 and 3d^10orbitals is distinct for the two oxygen atoms. Here we introduce sublattice resolved E(r) imaging techniques to CuO2 studies and discover intra-unit-cell rotational symmetry breaking of E(r), with energy-level splitting between the two oxygen atoms on the 50 meV scale. Spatially, this state is arranged in disordered Ising domains of orthogonally oriented orbital order that appear bounded by dopant ions, and within whose domain walls low energy electronic quadrupolar two-level systems occur. Overall, these data reveal a Q=0 orbitally ordered state that splits the energy levels of the oxygen orbitals by ~50 meV, in underdoped CuO2.
arXiv commentManuscript: 21 pages, 4 figures. Methods: 40 pages, 23 figures
References in corpus (50)
- Nematic order in iron superconductors - who is in the driver's seat?
- Gap symmetry and structure of Fe-based superconductors
- Theory of Intertwined Orders in High Temperature Superconductors
- Nematic Fermi Fluids in Condensed Matter Physics
- The doping dependence of T* - what is the real high-Tc phase diagram?
- Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states
- The pseudogap: friend or foe of high Tc?
- Magnetic order in the pseudogap phase of high- superconductors
- Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors
- Discovery of Orbital-Selective Cooper Pairing in FeSe
- Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
- From a single-band metal to a high-temperature superconductor via two thermal phase transitions (Supporting Material)
- From a single-band metal to a high-temperature superconductor via two thermal phase transitions
- Spontaneous time reversal symmetry breaking in the pseudogap state of high-Tc superconductors
- Ironing out the details of unconventional superconductivity
- Simultaneous Transitions in Cuprate Momentum-Space Topology and Electronic Symmetry Breaking
- Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides
- Quenched disorder and vestigial nematicity in the pseudo-gap regime of the cuprates
- Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates
- Thermodynamic evidence for nematic phase transition at the onset of pseudogap in YBaCuO
- Role of the orbital degree of freedom in iron-based superconductors
- A global inversion-symmetry-broken phase inside the pseudogap region of YBaCuO
- Bounding the pseudogap with a line of phase transitions in YBCO cuprate superconductors
- Topological Defects Coupling Smectic Modulations to Intra-unit-cell Nematicity in Cuprate
- Observation of Magnetic Order in a Superconductor
- Atomic-scale Electronic Structure of the Cuprate d-Symmetry Form Factor Density Wave State
- Visualizing the emergence of the pseudogap state and the evolution to superconductivity in a lightly hole-doped Mott insulator
- Visualizing the evolution from the Mott insulator to a charge ordered insulator in lightly doped cuprates
- On the Electron Pairing Mechanism of Copper-Oxide High Temperature Superconductivity
- Nematicity in stripe ordered cuprates probed via resonant x-ray scattering
- Intra-Unit-Cell magnetic correlations near optimal doping in
- Relationship between the parent charge transfer gap and maximum transition temperature in cuprates
- Evidence for a Vestigial Nematic State in the Cuprate Pseudogap Phase
- Spatially Modulated Electronic Nematicity in the Three-Band Model of Cuprate Superconductors
- Mean-Field Analysis of Intra-Unit-Cell Order in the Emery Model of the CuO Plane
- Diagonal Nematicity in the Pseudogap Phase of HgBaCuO
- Divergent nematic susceptibility near the pseudogap critical point in a cuprate superconductor
- Nematic Fluctuations in the Cuprate Superconductor BiSrCaCuO
- Orbital symmetry of charge density wave order in La1.875Ba0.125CuO4 and YBa2Cu3O6.67
- Quasi-1D dynamics and nematic phases in the 2D Emery model
- a-b anisotropy of the intra-unit-cell magnetic order in
- Multistage Electronic Nematic Transitions in Cuprate Superconductors: Functional-Renormalization-Group Analysis
- Resonant X-Ray Scattering Measurements of a Spatial Modulation of the Cu 3d and O 2p Energies in Stripe-Ordered Cuprate Superconductors
- Revealing the Coulomb interaction strength in a cuprate superconductor
- Nematic and spin-charge orders driven by hole-doping a charge-transfer insulator
- Nematicity in the pseudogap state of cuprate superconductors revealed by angle-resolved photoemission spectroscopy
- Emergent Charge Order from Correlated Electron-Phonon Physics in Cuprates
- Magnetic orders in the hole doped three-band Hubbard model: spin spirals, nematicity, and ferromagnetic domain walls
- Critical Nematic Correlations Throughout the Doping Range in BSCCO
- Theoretical insights into electronic nematic order, bond-charge orders, and plasmons in cuprate superconductors