X-ray scattering studies of charge stripes in La2−xSrxNiO4 (x=0.20−0.33)

Hatton, P. D.; Ghazi, M. E.; Wilkins, S. B.; Spencer, P. D.; Mannix, D.; d’Almeida, Thierry; Prabhakaran, P.V.; Boothroyd, A. T.; Cheong, Sang‐Wook

doi:10.1016/s0921-4526(02)00791-3

Cited by 16 publications

(25 citation statements)

References 14 publications

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“…2, for a series of LSNO films on STO substrates with different thicknesses. The stripe ordering temperature is about 240 K for all films, in agreement with experiments on bulk materials [19]. It appears that the ordering temperature does not change with the film thickness.…”

Section: Pacs Numberssupporting

confidence: 86%

Direct evidence for the suppression of charge stripes in epitaxialLa1.67Sr0.33NiO4films

et al. 2008

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We have successfully grown epitaxial La1.67Sr0.33NiO4 films with a small crystalline mosaic using pulsed laser deposition. With synchrotron radiation, the x-ray diffraction peaks associated with charge stripes have been successfully observed for relatively thick films. Anomalies due to the charge-ordering transition have been examined using four-point probe resistivity measurements. Xray scattering provides direct evidence for suppression of the stripe phase in thin samples; the phase disappears for film thicknesses 2600Å. The suppression appears to be a result of shrinking the stripe phase domains. This may reflect the stripe phase progressing from nematic to isotropic. PACS numbers:The real space ordering of charges, spins, and electronic orbitals in correlated electron materials has been a major topic in condensed matter physics in recent years. Such behavior has been found in a variety of transition metal oxides that exhibit a range of physical properties. A typical situation occurs when antiferromagnetic insulators of these oxides are electronically doped, the charge carriers tend to localize and order [1,2]. One of the most important types of order is generally known as stripes. This is best known in doped compounds of the La 2 CuO 4 family of high temperature superconductors. At a particular density of doped holes, n h = 1/8, there is a static, ordered arrangement of spins and charges forming stripes along the Cu-O bond direction [3]. The isostructural system La 2−x Sr x NiO 4+y shows a similar stripe structure but with an orientation rotated by 45 • with respect to the Ni-O bond direction in the planes. However, it does not exhibit superconductivity and even remains insulating for a wide doping range [4]. Furthermore, a variety of manganese oxide materials appears to show various types of charge, spin, and orbital ordering, some of which are stripe-like [5,6]. More recently, a short-range charge ordering in Ho-doped SrCoO 3−x cobaltite with chargeordered clusters size down to 50Å is observed for a broad compositional range [7]. As more examples of charge inhomogeneity are discovered, one might think that the spin-charge ordering may be a ubiquitous property of transitional metal oxides. However, there are certainly many examples of charge-doped transition metal oxides where no such charge inhomogeneity has been reported. It is thus important to understand the nature of charge ordering correlations, their effect on physical properties, and under what situations they will occur. To further such a goal, it would be very helpful to find a single materials system where the charge orders through an external tuning parameter that does not affect the charge concentration itself.There have been several efforts to investigate the correlation between the stripe phase and lattice distortion by applying mechanical strain in cuprate materials. The static stripe phase in La 1.875 Ba 0.125 CuO 4 and (LaNd) 1.875 Sr 0.125 CuO 4 is accompanied by a structural phase transition from a low temperature orthorhombic (LTO) to a...

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Section: Pacs Numberssupporting

confidence: 86%

Direct evidence for the suppression of charge stripes in epitaxialLa1.67Sr0.33NiO4films

et al. 2008

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“…Taken together, although the defect model captures the frequency and temperature dependence of the dielectric behavior, it is probably not applicable to understanding the fundamental origin of our observations. Charge inhomogeneity also is established in Sr-doped La 2−x Sr x NiO 4 where a charge-stripe glass was found for x = 0.20 and 0.25 [24]. In the cuprates, a similar chargestripe glass was suggested as a precursor to cluster spin glass formation [8,16,25].…”

mentioning

confidence: 86%

Novel Dielectric Anomaly in the Hole-DopedLa2Cu1−xL
Park
¹
,
Nussinov
²
,
Hazzard
³

et al. 2005
Phys. Rev. Lett.
Self Cite
100
7
72
0
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The low-frequency dielectric response of hole-doped insulators La2Cu1−xLixO4 and La2−xSrxNiO4 shows a large dielectric constant ε ′ at high temperature and a step-like drop by a factor of 100 at a material-dependent low temperature T f . T f increases with frequency and the dielectric response shows universal scaling in a Cole-Cole plot, suggesting that a charge glass state is realized both in the cuprates and in the nickelates.Charge inhomogeneities in hole-doped oxides attract great interest, in part due to their possible relation to high temperature superconductivity. Perhaps the best known examples are stripes, wherein holes congregate along lines which serve as domain boundaries in a surrounding antiferromagnetic environment. These were predicted [1,2] and observed in Nd-doped La 2−x Sr x CuO 4 [3] and in hole-doped, but insulating nickelates [4,5,6]. Inhomogeneities in these complex oxides are naturally linked to the competition between myriad interactions (e.g. Coulomb, kinetic, magnetic, strain,...). The resulting compromise amongst these is non-uniform structures [1,2] and experimental evidence for glassiness [7,8]. Theoretically, the non-uniform nature of these states easily allows for the proliferation of many metastable and low lying states. In accord with this intuition, replica calculations [9, 10] indeed suggest an exponentially large number of metastable states built from these rich non-uniform domains. This proliferation of metastable states allows, in principle, for a glass to naturally emerge. As spin and charge degrees of freedom are intertwined, glassy signatures and inhomogeneities in the spin sector naturally suggest analogous effects in the charge channel-nonuniform charge distributions should appear.In this Letter, we report the first observation of sharp dielectric anomalies both in the cuprates and nickelates. The low-frequency dielectric constants of La 2 Cu 1−x Li x O 4 (x ≈ 0.023) and La 2−x Sr x NiO 4 (x = 1/3) show a frequency-dependent drop from a large dielectric constant ε ′ , of order 10 4 , at high temperatures to a modest value (10 2 ) below a temperature T f . A phenomenological Davidson-Cole plot [11], commonly used to analyze classical structural glasses [11,12], successfully captures the dielectric behavior which shows universal scaling. The characteristic relaxation time obtained from the analysis shows a polynomial temperature dependence with a finite glass transition temperature T 0 , which is consistent with glassy charge dynamics arising from a collective behavior of doped holes both in the cuprates and in the nickelates.The Li-doped lanthanum cuprate La 2 Cu 1−x Li x O 4 crystals were prepared by flux growth and the Sr-doped lanthanum nickelate La 2−x Sr x NiO 4 was grown by the floating zone method [13]. For dielectric measurements, an Al 2 O 3 layer of 1000Å was deposited between the sample and metal contacts to prevent a polarization of charge at an electrode/sample interface that can produce a spurious dielectric response. Extensive tests were made to ensure th...

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“…From diffraction measurements it is known that the stripes have a finite length. 12,25 At the end of a charge stripe there is magnetic frustration where two antiphase spin domains meet without the charged wall to stabilize the antiphase configuration. Another possibility is variations in the direction of the ordered magnetic moments.…”

Section: 13mentioning

confidence: 99%

“…6,8,10,12,13,14,15,17,22,23,24,25,26 Charge ordering occurs at a temperature T CO typically 100-200 K depending on doping. Magnetic order occurs at a slightly lower temperature T SO .…”

mentioning

confidence: 99%

Magnetization ofLa2−xSrxNiO4+δ
Freeman
¹
,
Boothroyd
²
,
Prabhakaran
³

et al. 2006
Phys. Rev. B
24
5
22
0
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We have studied the magnetization of a series of spin-charge ordered La2−xSrxNiO 4+δ single crystals with 0 ≤ x ≤ 0.5. For fields applied parallel to the ab plane there is a large irreversibility below a temperature TF1 ∼ 50 K and a smaller irreversibility that persists up to near the charge ordering temperature. We observed a novel memory effect in the thermo-remnant magnetization across the entire doping range. We found that these materials retain a memory of the temperature at which an external field was removed, and that there is a pronounced increase in the thermo-remnant magnetization when the system is warmed through a spin reorientation transition.

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X-ray scattering studies of charge stripes in La2−xSrxNiO4 (x=0.20−0.33)

Cited by 16 publications

References 14 publications

Direct evidence for the suppression of charge stripes in epitaxialLa1.67Sr0.33NiO4films

Direct evidence for the suppression of charge stripes in epitaxialLa1.67Sr0.33NiO4films

Novel Dielectric Anomaly in the Hole-DopedLa2Cu1−xL
Park
¹
,
Nussinov
²
,
Hazzard
³

et al. 2005
Phys. Rev. Lett.
Self Cite
100
7
72
0
View full text Add to dashboard Cite

Magnetization ofLa2−xSrxNiO4+δ
Freeman
¹
,
Boothroyd
²
,
Prabhakaran
³

et al. 2006
Phys. Rev. B
24
5
22
0
View full text Add to dashboard Cite

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X-ray scattering studies of charge stripes in La2−xSrxNiO4 (x=0.20−0.33)

Cited by 16 publications

References 14 publications

Direct evidence for the suppression of charge stripes in epitaxialLa1.67Sr0.33NiO4films

Direct evidence for the suppression of charge stripes in epitaxialLa1.67Sr0.33NiO4films

Novel Dielectric Anomaly in the Hole-DopedLa2Cu1−xLPark1, Nussinov2, Hazzard3 et al. 2005Phys. Rev. Lett.Self Cite1007720View full textAdd to dashboardCite

Magnetization ofLa2−xSrxNiO4+δFreeman1, Boothroyd2, Prabhakaran3 et al. 2006Phys. Rev. B245220View full textAdd to dashboardCite

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Novel Dielectric Anomaly in the Hole-DopedLa2Cu1−xL
Park
¹
,
Nussinov
²
,
Hazzard
³

et al. 2005
Phys. Rev. Lett.
Self Cite
100
7
72
0
View full text Add to dashboard Cite

Magnetization ofLa2−xSrxNiO4+δ
Freeman
¹
,
Boothroyd
²
,
Prabhakaran
³

et al. 2006
Phys. Rev. B
24
5
22
0
View full text Add to dashboard Cite