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Wagener, W.; Klauss, H.-H.; Hillberg, M.; Melo, M.A.C. de; Birke, M.; Litterst, F. J.; Büautchner, B.; Micklitz, H.

doi:10.1103/physrevb.55.r14761

Cited by 36 publications

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“…From dc magnetization measurements, no superconducting transition is observed down to 4.2K. µSR studies of this sample reveal static spin order below 25K [16].The 139 La (I = …”

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confidence: 79%

Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15
Curro
¹
,
Hammel
²
,
Suh
³

et al. 2000
Phys. Rev. Lett.
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We report Cu and La nuclear magnetic resonance (NMR) measurements in the title compound that reveal an inhomogeneous glassy behavior of the spin dynamics. A low temperature peak in the La spin lattice relaxation rate and the "wipeout" of Cu intensity both arise from these slow electronic spin fluctuations that reveal a distribution of activation energies. Inhomogeneous slowing of spin fluctuations appears to be a general feature of doped lanthanum cuprate. PACS 74.72.Bk, 75.30.Ds, 75.40.Gb Lanthanum cuprate, the prototypical single layer high temperature superconductor, has been extensively studied for several years to understand the origin of its unusual normal state behavior as well as the mechanism for superconductivity. Rare earth co-doped lanthanum cuprate has received attention recently because elastic neutron scattering experiments have revealed ordering of doped holes into charged stripes that constitute antiphase domain walls producing incommensurate antiferromagnetic (AF) order in the intervening undoped domains [1]. Charge stripe order is likely intimately related to the high temperature superconductivity [2][3][4][5]. Isostructural lanthanum nickelate demonstrates clear stripe order [6], and it has been shown there that both the charge order and the magnetic order are glassy [6,7]. It is also known that the magnetic order associated with charge ordering in lanthanum cuprate is glassy [8,9], but this situation is more difficult because the charge superlattice peaks are very hard to observe, presumably because the stripes tend to be dynamic. As a consequence little detail is known about the glassy behavior. Hunt et al. have observed suppression of the Cu NQR signal intensity ("wipeout") with decreasing temperature that they attribute to charge stripe order [10].NMR provides information complementary to neutron scattering because the nuclei are sensitive to the local magnetic field and the dynamic behavior of the electronic system without requiring spatial correlations. Chou et al., first proposed that the very strong peak in the 139 La nuclear spin relaxation rate displays an activated temperature dependence [13]. Furthermore, these data demonstrate a distribution P (E a ) of activation energies E a centered at E a /k B T ∼ 50 K and with a width comparable this center value indicating strongly inhomogeneous magnetic properties [13]. To understand if this inhomogeneity arises from disorder due to, e.g., substitutional dopants, we have applied this analysis to several lanthanum cuprate systems exhibiting AF order at low temperatures to allow us to explore the effect of varying the density and character of the disorder: in-plane doping by Li substitution for Cu, variation of doping density in LTT phase La 1.8−x Eu 0.2 Sr x CuO 4 : 0.01 ≤ x ≤ 0.15. Remarkably, we find that the character of the inhomogeneity, that is, the distribution of activation energies is essentially unchanged in all these cases and very similar to lightly doped La 2−x Sr x CuO 4 [11], suggesting that this inhomogeneity is intrinsi...

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“…From dc magnetization measurements, no superconducting transition is observed down to 4.2K. µSR studies of this sample reveal static spin order below 25K [16].The 139 La (I = …”

mentioning

confidence: 79%

Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15
Curro
¹
,
Hammel
²
,
Suh
³

et al. 2000
Phys. Rev. Lett.
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145
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“…The substituion of La 3+ with the smaller Nd 3+ causes T c to go down even in the LTO phase, most likely as a consequence of the larger Φ. 30,81,84 For comparison, in La 2−x Ba x CuO 4 T HT and the corresponding Φ at low T are even smaller than in Nd-free La 2−x Sr x CuO 4 . The stronger suppression of the bulk SC in the Nd-doped system also corresponds with a broader range of x over which stripe order is detectable.…”

Section: Comparison With Lbco Nd-lsco and Eu-lscomentioning

confidence: 99%

“…15 determined by ND are several times higher than the maximum bulk T c , with the caveat that truly static SO occurs at much lower temperatures, as confirmed by a number of µSR studies. 40,69,[81][82][83] The relatively low T c values, on the other hand, follow from a stronger suppression in the Nd-doped system. The substituion of La 3+ with the smaller Nd 3+ causes T c to go down even in the LTO phase, most likely as a consequence of the larger Φ.…”

Section: Comparison With Lbco Nd-lsco and Eu-lscomentioning

confidence: 99%

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
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The correlations between stripe order, superconductivity, and crystal structure in La2−x Bax CuO4 single crystals have been studied by means of x-ray and neutron diffraction as well as static magnetization measurements. The derived phase diagram shows that charge stripe order (CO) coexists with bulk superconductivity in a broad range of doping around x = 1/8, although the CO order parameter falls off quickly for x = 1/8. Except for x = 0.155, the onset of CO always coincides with the transition between the orthorhombic and the tetragonal low temperature structures. The CO transition evolves from a sharp drop at low x to a more gradual transition at higher x, eventually falling below the structural phase boundary for optimum doping. With respect to the interlayer CO correlations, we find no qualitative change of the stripe stacking order as a function of doping, and in-plane and out-of-plane correlations disappear simultaneously at the transition. Similarly to the CO, the spin stripe order (SO) is also most pronounced at x = 1/8. Truly static SO sets in below the CO and coincides with the first appearance of in-plane superconducting correlations at temperatures significantly above the bulk transition to superconductivity (SC). Indications that bulk SC causes a reduction of the spin or charge stripe order could not be identified. We argue that CO is the dominant order that is compatible with SC pairing but competes with SC phase coherence. Comparing our results with data from the literature, we find good agreement if all results are plotted as a function of x ′ instead of the nominal x, where x ′ represents an estimate of the actual Ba content, extracted from the doping dependence of the structural transition between the orthorhombic phase and the tetragonal high-temperature phase.

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“…7,[18][19][20] In samples with a fully developed static stripe order, superconductivity is strongly suppressed. 18,[20][21][22] Another example is observed in orthorhombic La 2−x Sr x CuO 4 below the metal insulator ͑MI͒ transition ͑x Ͻ 0.06͒, i.e., in the short-range ordered spin-stripe phase. The ground state is insulating, with spin stripes running diagonally to the square lattice.…”

Section: Introductionmentioning

confidence: 99%

Unidirectional diagonal order and three-dimensional stacking of charge stripes in orthorhombicPr1.67Sr0.33NiO4and
Hücker
¹
,
Zimmermann
²
,
Klingeler
³

et al. 2006
Phys. Rev. B
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The interplay between crystal symmetry and charge stripe order in Pr 1.67 Sr 0.33 NiO 4 and Nd 1.67 Sr 0.33 NiO 4 has been studied by means of single crystal x-ray diffraction. In contrast to tetragonal La 1.67 Sr 0.33 NiO 4 , these crystals are orthorhombic. The corresponding distortion of the NiO 2 planes is found to dictate the direction of the charge stripes, similar to the case of diagonal spin stripes in the insulating phase of La 2−x Sr x CuO 4 . In particular, diagonal stripes seem to always run along the short a axis, which is the direction of the octahedral tilt axis. In contrast, no influence of the crystal symmetry on the charge stripe ordering temperature itself was observed, with T CO ϳ 240 K for La, Pr, and Nd. The coupling between lattice and stripe degrees of freedom allows one to produce macroscopic samples with unidirectional stripe order. In samples with stoichiometric oxygen content and a hole concentration of exactly 1 / 3, charge stripes exhibit a staggered stacking order with a period of three NiO 2 layers, previously only observed with electron microscopy in domains of mesoscopic dimensions. Remarkably, this stacking order starts to melt about 40 K below T CO . The melting process can be described by mixing the ground state, which has a three-layer stacking period, with an increasing volume fraction with a two-layer stacking period.

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Magnetic order inLa1.85−xNd
W. Wagener
¹
,
H.-H. Klauss
²
,
M. Hillberg
³

et al.

Cited by 36 publications

References 0 publications

Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15
Curro
¹
,
Hammel
²
,
Suh
³

et al. 2000
Phys. Rev. Lett.
Self Cite
145
23
145
0
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Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15
Curro
¹
,
Hammel
²
,
Suh
³

et al. 2000
Phys. Rev. Lett.
Self Cite
145
23
145
0
View full text Add to dashboard Cite

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
309
43
411
2
View full text Add to dashboard Cite

Unidirectional diagonal order and three-dimensional stacking of charge stripes in orthorhombicPr1.67Sr0.33NiO4and
Hücker
¹
,
Zimmermann
²
,
Klingeler
³

et al. 2006
Phys. Rev. B
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Magnetic order inLa1.85−xNdW. Wagener1, H.-H. Klauss2, M. Hillberg3 et al.

Cited by 36 publications

References 0 publications

Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15Curro1, Hammel2, Suh3 et al. 2000Phys. Rev. Lett.Self Cite145231450View full textAdd to dashboardCite

Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15Curro1, Hammel2, Suh3 et al. 2000Phys. Rev. Lett.Self Cite145231450View full textAdd to dashboardCite

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. B309434112View full textAdd to dashboardCite

Unidirectional diagonal order and three-dimensional stacking of charge stripes in orthorhombicPr1.67Sr0.33NiO4andHücker1, Zimmermann2, Klingeler3 et al. 2006Phys. Rev. BSelf Cite

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Magnetic order inLa1.85−xNd
W. Wagener
¹
,
H.-H. Klauss
²
,
M. Hillberg
³

et al.

Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15
Curro
¹
,
Hammel
²
,
Suh
³

et al. 2000
Phys. Rev. Lett.
Self Cite
145
23
145
0
View full text Add to dashboard Cite

Inhomogeneous Low Frequency Spin Dynamics inLa1.65Eu0.2Sr0.15
Curro
¹
,
Hammel
²
,
Suh
³

et al. 2000
Phys. Rev. Lett.
Self Cite
145
23
145
0
View full text Add to dashboard Cite

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
309
43
411
2
View full text Add to dashboard Cite

Unidirectional diagonal order and three-dimensional stacking of charge stripes in orthorhombicPr1.67Sr0.33NiO4and
Hücker
¹
,
Zimmermann
²
,
Klingeler
³

et al. 2006
Phys. Rev. B
Self Cite