Spin excitations in a single La2CuO4 layer.

  title={Spin excitations in a single La2CuO4 layer.},
  author={Mark. P. M. Dean and Ross S Springell and Claude Monney and K. J. Zhou and J. Pereiro and Ivan Bo{\vz}ovi{\'c} and B Dalla Piazza and Henrik M. R{\o}nnow and Elvezio Morenzoni and Jeroen van den Brink and Thorsten Schmitt and J P Hill},
  journal={Nature materials},
  volume={11 10},
Cuprates and other high-temperature superconductors consist of two-dimensional layers that are crucial to their properties. The dynamics of the quantum spins in these layers lie at the heart of the mystery of the cuprates. In bulk cuprates such as La(2)CuO(4), the presence of a weak coupling between the two-dimensional layers stabilizes a three-dimensional magnetic order up to high temperatures. In a truly two-dimensional system however, thermal spin fluctuations melt long-range order at any… 

Figures and Topics from this paper

Giant magnetic response of a two-dimensional antiferromagnet
A fundamental difference between antiferromagnets and ferromagnets is the lack of linear coupling to a uniform magnetic field due to the staggered order parameter1. Such coupling is possible via the
Consideration of thermal Hall effect in undoped cuprates
A recent observation of thermal Hall effect of magnetic origin in underdoped cuprates calls for critical re-examination of low-energy magnetic dynamics in undoped antiferromagnetic compound on square
Structural, Electronic and Magnetic Properties of a Few Nanometer-Thick Superconducting NdBa2Cu3O7 Films
Epitaxial films of high critical temperature (Tc) cuprate superconductors preserve their transport properties even when their thickness is reduced to a few nanometers, and it is found that even at extremely low thicknesses, the strength of the in-plane superexchange interaction is mostly preserved.
High-temperature charge density wave correlations in La1.875Ba0.125CuO4 without spin–charge locking
High-temperature charge correlations are unlocked from the wavevector of the spin correlations, signaling analogies to CDW phases in various other cuprates, indicating that stripe order at low temperatures is stabilized by the coupling of otherwise independent charge and spin density waves.
Superconducting- and Insulating-Ground States in La2CuO4 Structural Isomers
La2CuO4, with the K2NiF4-structure, is known as the parent compound of hole-doped cuprate superconductors where the Cu ions are octahedrally coordinated and subject to the Jahn–Teller effect. While
What is really extraordinary in cuprate superconductors?
Abstract Over the course of three decades of intense study, apart from the exceptionally high critical temperature, many unusual properties of cuprates have been discovered, notably including
Low-energy singlet excitations in spin- 1/2 Heisenberg antiferromagnet on square lattice
Abstract We present an approach based on a dimer expansion which describes low-energy singlet excitations (singlons) in spin- 1 2 Heisenberg antiferromagnet on simple square lattice. An operator
The Vanishing Superfluid Density in Cuprates—and Why It Matters
Recently, we have released the results of a comprehensive study of a couple thousand single-crystal La2−xSrxCuO4 films, covering densely the entire overdoped side of the phase diagram (Božović et al.
Formation of Incommensurate Charge Density Waves in Cuprates
Although charge density waves (CDWs) are omnipresent in cuprate high-temperature superconductors, they occur at significantly different wavevectors, confounding efforts to understand their formation
Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides.
An isostructural cobaltate is studied that also exhibits an hour-glass magnetic spectrum and a microscopically split origin of hour- glass spectra is unraveled pointing to a connection between the magnetic resonance peak and the spin gap originating in islands of the antiferromagnetic parent insulator.


Nature of spin excitations in two-dimensional mott insulators: undoped cuprates and other materials.
The excitation spectrum of a two-dimensional resonating valence bond (RVB) state is investigated and its characteristic energy scales along different high symmetry directions in the magnetic Brillouin zone are predicted.
The Resonating Valence Bond State in La2CuO4 and Superconductivity
The oxide superconductors, particularly those recently discovered that are based on La2CuO4, have a set of peculiarities that suggest a common, unique mechanism: they tend in every case to occur near
The Resonating Valence Bond State in La 2 CuO 4 and Superconductivity
The oxide superconductors, particularly those recently discovered that are based on La2CuO4have a set of peculiarities that suggest a common, unique mechanism: they tend in every case to occur near a
The spin- 1/2 Heisenberg antiferromagnet on a square lattice and its application to the cuprous oxides
The spin-1/2 antiferromagnetic Heisenberg model on a square lattice is used to describe the dynamics of the spin degrees of freedom of undoped copper oxides. Even though the model lacks an exact
Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor
Inelastic neutron scattering results for HgBa2CuO4+δ reveal a fundamental collective magnetic mode associated with the unusual order and are consistent with a particular type of order involving circulating orbital currents, and with the notion that the phase diagram is controlled by a quantum critical point.
Magnetism in the 2D Limit and Interface Superconductivity in Metal-Insulator La2 xSrxCuO4 Superlattices
By reducing the dimensionality of a solid, its elec-tronic states and physical properties can be drasti-cally modified, but these changes are not easy to pre-dict for strongly correlated electron
Measurement of magnetic excitations in the two-dimensional antiferromagnetic Sr₂CuO₂Cl₂ insulator using resonant x-ray scattering: evidence for extended interactions.
The spectral line shape at (π, 0) indicates sizable quantum effects in SCOC and probably more generally in the cuprates, and an extended t-t'-t''-U one-band Hubbard model is employed, finding significant electronic hopping beyond nearest-neighbor Cu ions, indicative of extended magnetic interactions.
Spin waves and electronic interactions in La2CuO4.
The observed dispersion relation shows evidence for substantial interactions beyond the nearest-neighbor Heisenberg term which can be understood in terms of a cyclic or ring exchange due to the strong hybridization path around the Cu4O4 square plaquettes.
Spin dynamics of the 2D spin 1/2 quantum antiferromagnet copper deuteroformate tetradeuterate (CFTD).
A consistent description of the behavior of the model system is found over the whole temperature interval investigated, including at higher temperatures, spin-wavelike excitations persist, but are found to broaden and soften.
Two-dimensional magnetic and superconducting phases in metal-insulator La(2-x)Sr(x)CuO(4) superlattices measured by muon-spin rotation.
We show, by means of low-energy muon-spin rotation measurements, that few-unit-cells thick La(2)CuO(4) layers synthesized digitally by molecular beam epitaxy are antiferromagnetically ordered. Below