Superconductivity of a metallic stripe embedded in an antiferromagnet

Krotov, Yu. A.; Lee, D.-H.; Balatsky, Alexander V.

doi:10.1103/physrevb.56.8367

Cited by 26 publications

(25 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect is an interesting SO͑5͒ analog of the result of Krotov et al [9] that superconductivity between antiferromagnetic stripes is suppressed for nontopological stripes and enhanced for topological stripes. [10].…”

mentioning

confidence: 71%

Proximity Effect and Josephson Coupling in the SO(5) Theory of High-TcSuperconductivity

et al. 1998

View full text Add to dashboard Cite

We consider proximity effect coupling in Superconducting/Antiferromagnetic/Superconducting (S-A-S) sandwiches using the recently developed SO(5) effective theory of high temperature superconductivity. We find that, for narrow junctions, the A region acts like a strong superconductor, and that there is a critical junction thickness which depends on the effective SO(5) coupling constants and on the phase difference across the junction, at which the A region undergoes a Freedericksz-like transition to a state which is intermediate between superconductor and antiferromagnet. For thick junctions, the current-phase relation is sinusoidal, as in standard S-N-S and S-I-S junctions, but for thin junctions it shows a sharp break in slope at the Freedericksz point.

show abstract

mentioning

confidence: 71%

Proximity Effect and Josephson Coupling in the SO(5) Theory of High-TcSuperconductivity

et al. 1998

View full text Add to dashboard Cite

show abstract

“…The possible existence of such hole-rich stripe phases has been proposed in the form of antiphase domain boundaries between antiferromagnetically ordered spins in the study of some high temperature superconducting oxides [10][11][12][13][14][15] and colossal magnetoresistance manganites [16]. Stripes were first observed in nickelate oxides [17], and the Hubbard model in Hartree-Fock(HF) approximation gave a good description of the ground state of the doped nickelates [7].…”

Section: Introductionmentioning

confidence: 99%

Signatures of stripe phases in hole-dopedLa2NiO4

Bishop

et al. 1998

Phys. Rev. B

View full text Add to dashboard Cite

We model nickelate-centered and oxygen-centered stripe phases in doped La2NiO4 materials. We use an inhomogeneous Hartree-Fock and random-phase approximation approach including both electronelectron and electron-lattice(e-l) coupling for a layer of La2NiO4. We find that whether the ground state after commensurate hole doping comprises Ni-centered or O-centered charge-localized stripes depends sensitively on the e-l interaction. With increasing e-l interaction strength, a continuous transition from an O-centered stripe phase to a Ni-centered one is found. Various low-and highenergy signatures of these two kinds of stripe phases are predicted, which can clearly distinguish them. These signatures reflect the strongly correlated spin-charge-lattice features in the vicinity of Ni-centered or O-centered stripe domains. The importance of e-l interaction for recent experiments on stripe phases is discussed.

show abstract

“…(1)) and not for "bond-centered" metallic stripes. This seems important since it has been argued [16], that, for bondcentered stripes, superconductivity is expected to survive stripe ordering. In the DMRG calculations by White and Scalapino [17] as well as in dynamical mean-field (DMFT) studies by Fleck et al [18], bond-centered and site-centered domains are very close in energy (groundstate).…”

mentioning

confidence: 99%

Stripes in Doped Antiferromagnets: Single-Particle Spectral Weight

et al. 2000

View full text Add to dashboard Cite

Recent photoemission (ARPES) experiments on cuprate superconductors provide important guidelines for a theory of electronic excitations in the stripe phase. Using a cluster perturbation theory, where short-distance effects are accounted for by exact cluster diagonalization and long-distance effects by perturbation (in the hopping), we calculate the single-particle Green's function for a striped t-J model. The data obtained quantitatively reproduce salient (ARPES-) features and may serve to rule out "bond-centered" in favor of "site-centered" stripes. [4]. At present, there is an intensive discussion and controversy, whether stripes are directly connected with and beneficial for the microscopic mechanism in HTSC [5][6][7][8][9][10][11]. What is clear, however, is that the apparent presence of static or dynamic stripes crucially influences low-energy excitations and thus the foundations for such a microscopic theory. Evidence for this has recently been accumulated by angleresolved photoemission spectroscopy (ARPES) both on the static stripes in the Nd-LSCO system [3] and on dynamic domain walls in the LSCO compound [12,13]. The electronic structure revealed by ARPES contains characteristic features consistent with other cuprates, such as the flat band at low energy near the Brillouin zone face (k = (π, 0)). In Nd-LSCO, the frequency-integrated spectral weight is confined inside 1D-segments in k-space, deviating strongly from the more rounded Fermi surface expected from band calculations.In this Letter, we present a numerical study of the singleelectron excitations in a striped phase via cluster perturbation theory (CPT) [14] and a detailed comparison with recent ARPES results. The basic idea of our application of the CPT is indicated in Fig.(1): it is based on dividing the 2D plane into alternating clusters of metallic stripes and AF domains. The individial clusters are modeled by the microscopic t-J hamiltonian and solved exactly via exact diagonalization (ED). Then the intercluster hopping linking the alternating metallic and AF domains is incorporated perturbatively via CPT on the basis of the exact cluster Green's functions thus yielding the spectral function of the infinite 2D plane in a striped phase. Using this CPT approach, the important short-distance interaction effects within the stripes are taken into account exactly while longer-ranged hopping effects are treated perturbatively. A study of the properties of experimentally observed stripe phases solely by ED [15] is precluded by the prohibitively large unit cells.The manageable clusters for ED are simply too small to accommodate even a single such unit cell.Our main results are: (i) close to k = (π, 0) we see, like in experiments, a two-component electronic feature (see Fig.(2)): a sharp low-energy feature close to E F and a more broad feature at higher binding energies. Both features can be explained by the mixing of metallic and antiferromagnetic bands at this k-point. (ii) the excitation near (π/2, π/2) is at higher binding energies than the lowene...

show abstract

Superconductivity of a metallic stripe embedded in an antiferromagnet

Cited by 26 publications

References 24 publications

Proximity Effect and Josephson Coupling in the SO(5) Theory of High-TcSuperconductivity

Proximity Effect and Josephson Coupling in the SO(5) Theory of High-TcSuperconductivity

Signatures of stripe phases in hole-dopedLa2NiO4

Stripes in Doped Antiferromagnets: Single-Particle Spectral Weight

Contact Info

Product

Resources

About