Two Ising-like magnetic excitations in a single-layer cuprate superconductor

Abstract

There exists increasing evidence that the phase diagram of the high-transition temperature (Tc) cuprate superconductors is controlled by a quantum critical point. One distinct theoretical proposal is that, with decreasing hole-carrier concentration, a transition occurs to an ordered state with two circulating orbital currents per CuO2 square. Below the 'pseudogap' temperature T* (T* > Tc), the theory predicts a discrete order parameter and two weakly-dispersive magnetic excitations in structurally simple compounds that should be measurable by neutron scattering. Indeed, novel magnetic order and one such excitation were recently observed. Here, we demonstrate for tetragonal HgBa2CuO4+d the existence of a second excitation with local character, consistent with the theory. The excitations mix with conventional antiferromagnetic fluctuations, which points toward a unifying picture of magnetism in the cuprates that will likely require a multi-band description.

arXiv commentIncluding supplementary information

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Cited by in corpus (25)

• Asymmetry of collective excitations in electron and hole doped cuprate superconductors
• Evidence for a Fermi liquid in the pseudogap phase of high-Tc cuprates
• Hall, Seebeck, and Nernst Coefficients of Underdoped HgBa2CuO4+d: Fermi-Surface Reconstruction in an Archetypal Cuprate Superconductor
• Angle-resolved photoemission spectroscopy study of HgBa${}_2$CuO${}_{4+\delta }$
• Evidence for Intra-Unit-Cell magnetic order in Bi2Sr2CaCu2O8+d
• Quasi-static magnetoelectric quadrupoles as the order parameter for the pseudo-gap phase in cuprate superconductors
• Relationship among superconductivity, pseudogap, and high-energy magnetic fluctuations in a model high-Tc superconductor from electronic Raman scattering
• Macroscopic phase segregation in superconducting K0.73Fe1.67Se2 as seen by muon spin rotation and infrared spectroscopy
• Unravelling local spin polarization of Zhang-Rice singlet in lightly hole-doped cuprates using high-energy optical conductivity
• Staggered Flux State in Two-Dimensional Hubbard Models
• Q=0 collective modes originating from the low-lying Hg-O band in the superconducting HgBa2CuO4+δ
• Theory of Polarized Neutron Scattering in the Loop Ordered Phase of Cuprates
• Phonon spectrum of underdoped ${\text{HgBa}}_2{\text{CuO}}_{4+\delta }$ investigated by neutron scattering
• Growth and characterization of HgBa2CaCu2O6+d and HgBa2Ca2Cu3O8+d crystals
• Origin of Kinks in Energy Dispersion of Strongly Correlated Matter
• Determination of boson spectrum from optical data in pseudogap phase of underdoped cuprates
• In search for the pairing glue in cuprates by non-equilibrium optical spectroscopy
• Three interaction energy scales in single-layer high-T${}_C$ cuprate HgBa${}_2$CuO${}_{4+\delta }$
• Amplitude mode of the $d$-density wave state and its relevance to high-$T_c$ cuprates
• Discerning electronic fingerprints of nodal and antinodal nestings and their phase coherences in doped cuprate superconductors
• Theory of dual fermion superconductivity in hole-doped cuprates
• Coupling of Magnetic Orders in La2CuO4+x
• Free energy and metastable states in the square-lattice $J_1$-$J_2$ Ising model
• Origin of the unusual strong suppression of low frequency antiferromagnetic fluctuations in underdoped HgBa${}_2$CuO${}_{4+\delta }$
• Anomalous dispersion relations in the staggered flux state