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Hayden, Stephen M; Lander, G. H.; Zarestky, J.; Brown, P.; Stassis, C.; Metcalf, P.; Honig, J.M.

doi:10.1103/physrevlett.68.1061

Cited by 126 publications

(86 citation statements)

References 21 publications

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“…The simultaneous appearence of charge and spin superstructures seems to be present in completely different systems. For example, charge, lattice and spin modulations with a doping-dependent wave vector have been observed in La 2−x Sr x NiO 4 by means of neutron scattering [1] and electron diffraction [2]. Stripe formation, together with incommensurate spin fluctuations in high Tc superconductors can also be regarded as a manifestation of similar phenomena [3].…”

Section: Introductionmentioning

confidence: 99%

Charge and spin inhomogeneous phases in the ferromagnetic Kondo lattice model

et al. 2002

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We study numerically the one-dimensional ferromagnetic Kondo lattice. This model is widely used to describe nickel and manganese perovskites. Due to the competition between double and super-exchange, we find a region where the formation of magnetic polarons induces a charge-ordered state. This ordering is present even in the absence of any inter-site Coulomb repulsion. There is an insulating gap associated to the charge structure formation. We also study the insulator-metal transition induced by a magnetic field which removes simultaneously both charge and spin ordering.

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Section: Introductionmentioning

confidence: 99%

Charge and spin inhomogeneous phases in the ferromagnetic Kondo lattice model

et al. 2002

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“…excitations at incommensurate wavevectors [4], have been interpreted as evidence for dynamic stripe correlations [5]. At the same time, the characteristic spin excitation spectrum of ideal stripes has been probed in studies of non-superconducting compounds with well defined stripe order, especially La 2−x Sr x NiO 4+δ [6,7]. In none of these previous studies, however, has any evidence been found for spin correlations among the stripe electrons themselves.…”

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confidence: 99%

Spin Correlations among the Charge Carriers in an Ordered Stripe Phase

et al. 2003

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We have observed a diffuse component to the low-energy magnetic excitation spectrum of stripeordered La 5/3 Sr 1/3 NiO4 probed by neutron inelastic scattering. The diffuse scattering forms a square pattern with sides parallel and perpendicular to the stripe directions. The signal is dispersive, with a maximum energy of ∼ 10 meV. Probed at 2 meV the scattering decreases in strength with increasing temperature, and is barely visible at 100 K. We argue that the signal originates from dynamic, quasione-dimensional, antiferromagnetic correlations among the stripe electrons.PACS numbers: 75.40. Gb, 71.45.Lr, 75.30.Et, 75.30.Fv The occurence of stripe correlations in superconducting cuprates and other doped antiferromagnets is well established from extensive experimental studies [1] following earlier theoretical work [2]. The stripe phase is characterized by a segregation of charge carriers into narrow channels that act as antiphase domain walls separating antiferromagnetic regions of the host spins. Several theoretical scenarios have been presented in which a spin gap and pairing instabilities appear among the stripe electrons, opening the door to superconductivity [3]. These findings suggest that stripes could play an important role in the physics of high-T c superconductivity.Given the characteristic spin and charge correlations associated with local stripe order it is natural to search the spin excitation spectrum for clues to the relationship between stripes and superconductivity. Neutron inelastic scattering has revealed a number of interesting features in the spin dynamics of the cuprate superconductors, some of which, e.g. excitations at incommensurate wavevectors [4], have been interpreted as evidence for dynamic stripe correlations [5]. At the same time, the characteristic spin excitation spectrum of ideal stripes has been probed in studies of non-superconducting compounds with well defined stripe order, especially La 2−x Sr x NiO 4+δ [6,7]. In none of these previous studies, however, has any evidence been found for spin correlations among the stripe electrons themselves.In this paper we report neutron inelastic scattering measurements on La 5/3 Sr 1/3 NiO 4 which reveal a pattern of inelastic diffuse scattering consistent with the existence of quasi-one-dimensional (1D) antiferromagnetic (AF) correlations parallel to the stripe direction. The correlations are found to be dynamic, with a maximum energy ∼ 10 meV. The results provide the first evidence for spin correlations among the charge carriers in a stripe phase.The experiments were performed on single crystals of La 5/3 Sr 1/3 NiO 4 grown by the floating-zone method [8]. Neutron inelastic scattering data were collected on the triple-axis spectrometers IN8, IN20 and IN22 at the Institut Laue-Langevin, and RITA-II at the Paul Scherrer Institut. Most of the data reported here were obtained with a fixed scattered neutron energy E f = 14.7 meV and with a graphite filter installed after the sample to suppress higher orders. The exception is the inelastic sca...

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“…Historically, the first evidence for unusual magnetic correlations was obtained in doped nickel oxide, namely on a single crystal of La 1.8 Sr 0.2 NiO 3.96 in a neutron diffraction study [1]; similar magnetic ordering was also observed in La 2 NiO 4.125 [2]. A second set of superlattice peaks, indicative of charge order, was detected in a series of La 2-x Sr x NiO 4+d samples by electron diffraction [3].…”

Section: Introductionmentioning

confidence: 92%

“…The unit-cell vectors a 1 and a 2 are parallel to nearest-neighbor Ni-O bonds within the planes, and a 3 is perpendicular to the planes. There are two NiO 2 planes per unit cell, and they are related by the basic vector 1 2 a 1 + 1 2 a 2 + 1 2 a 3 . For each Ni ion there is one out-of-plane oxygen atom directly above and one atom below (along a 3 axis) effectively completing a tetragonally-distorted octahedron of oxygen ions.…”

Section: Introductionmentioning

confidence: 99%

Phonons and magnons in stripe-ordered nickelates. A Raman scattering study

Gnezdilov

Kurnosov

Yeremenko

et al. 2005

Low Temperature Physics

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Electronic correlation effects in La 2-x Sr x NiO 4 (x = 1/3 and 0.225) lead to spontaneous phase separation into microscopic spin/charge stripes with commensurate and incommensurate order, respectively. Raman scattering experiments on such single crystalline materials show a rich phenomenology of phonon and magnon anomalies due to the new, self-organized periodicities. These effects are observable as function of temperature but can also be induced by cooling in a seemingly small magnetic field leading to a reorganization of stripe structure.

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Incommensurate magnetic correlations inLa1.8Sr0.2

Cited by 126 publications

References 21 publications

Charge and spin inhomogeneous phases in the ferromagnetic Kondo lattice model

Charge and spin inhomogeneous phases in the ferromagnetic Kondo lattice model

Spin Correlations among the Charge Carriers in an Ordered Stripe Phase

Phonons and magnons in stripe-ordered nickelates. A Raman scattering study

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