Structural Transitions and Localization in La2-x-yNdySrxCuO4withp∼1/8

Sakita, S.; Nakamura, Fumihiko; Suzuki, Takashi; Fujita, Toshizo

doi:10.1143/jpsj.68.2755

Cited by 20 publications

(19 citation statements)

References 16 publications

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“…In the case of La 2−x−y Nd y Sr x CuO 4 , where crystals first became available, the drop in resistivity for x = 0.12 and y տ 0.2 occurs at a relatively low temperature and does not depend much on the direction in which the current flows; however, the resistive drop does tend to occur at a temperature significantly higher than the bulk onset of diamagnetism. 70,71 The diamagnetism can be a bit tricky to measure because of the large paramagnetic response of the Nd moments; 72 nevertheless, Ding et al 73 recently measured the anisotropy of the diamagnetic response in La 1.6−x Nd 0.4 Sr x CuO 4 with x = 0.10, 0.15, and 0.18. The results for x = 0.15 look quite similar to those for LBCO, with a diamagnetic response in Ќ , but not ʈ , starting at 21 K, followed by a 3D diamagnetic transition at ϳ13 K, where ab effectively reaches zero.…”

Section: G Specific Heatmentioning

confidence: 99%

Evidence for unusual superconducting correlations coexisting with stripe order inLa1.875Ba0.125CuO4

et al. 2008

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We present new x-ray and neutron-scattering measurements of stripe order in La 1.875 Ba 0.125 CuO 4 , along with low-field susceptibility, thermal conductivity, and specific-heat data. We compare these with previously reported results for resistivity and thermopower. Temperature-dependent features indicating transitions ͑or cross-overs͒ are correlated among the various experimental quantities. Taking into account recent spectroscopic studies, we argue that the most likely interpretation of the complete collection of results is that an unusual form of two-dimensional superconducting correlations appears together with the onset of spin-stripe order. Recent theoretical proposals for a sinusoidally modulated superconducting state compatible with stripe order provide an intriguing explanation of our results and motivate further experimental tests. We also discuss evidence for one-dimensional pairing correlations that appear together with the charge order. With regard to the overall phenomenology, we consider the degree to which similar behavior may have been observed in other cuprates and describe possible connections to various puzzling phenomena in cuprate superconductors.

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Section: G Specific Heatmentioning

confidence: 99%

Evidence for unusual superconducting correlations coexisting with stripe order inLa1.875Ba0.125CuO4

et al. 2008

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“…(2) The q-1d instability is, however, usually masked by the more prominent d-wave pairing instability. (3) Nonetheless, the presence of small extrinsic spatial anisotropy is sufficient for the q-1d state to manifest in the d-wave pairing state; as an origin of such anisotropy in LSCO systems, we may assume the lattice distortion due to the low-temperature tetragonal (LTT) structure [18][19][20] or its fluctuations. [21][22][23] (The q-1d instability of the FS, as well as its competing nature with d-wave pairing instability, has independently been found in the Hubbard model also by Halboth and Metzner.…”

mentioning

confidence: 99%

Magnetic Excitation oft–JModel with Quasi-One-Dimensional Fermi Surface – Possible Relevance to LSCO Systems

Yamase

Kohno

2001

J. Phys. Soc. Jpn.

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On the basis of the picture of a quasi-one-dimensional (q-1d) Fermi surface (FS), recently proposed by authors for LSCO systems, spin excitation spectrum, Imχ(q, ω), is calculated in the 'RPA' within the slave-boson mean-field approximation to the t-J model. It is found that Imχ(q, ω) shows both incommensurate (IC) and diagonal IC (DIC) peaks, whose realization does not depend on the existence of the d-wave gap. The peak positions do not change appreciably with ω and the sharp peaks survive down to the low hole doping rate. The d-wave gap suppresses both the IC peak and the DIC peak, but the degree of suppression as a function of ω is different between them. Taking these results together with results for the two-dimensional FS, we argue that essential features of magnetic excitation in LSCO systems can be understood in terms of the q-1d picture of the FS.

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“…Because of dFSD correlations, the shape of the FS in La-based cuprates may depend strongly on the crystal structure. [48] In the presence of the LTT structure, which was observed in LBCO [68], Nd-doped LSCO [69], and LSCO with x = 0.12 [70], we expect that dFSD correlations lead to a strongly deformed FS as shown in Fig. 2 through coupling to a small xy anisotropy of the lattice.…”

Section: A Magnetic Excitations In La-based Cupratesmentioning

confidence: 93%

Magnetic excitations in La-based cuprate superconductors: Slave-boson mean-field analysis of the two-dimensionalt−Jmodel

Yamase

2007

Phys. Rev. B

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Motivated by recent inelastic neutron scattering experiments up to a high-energy region forLa-based cuprates, we compute (q, ω) maps of the imaginary part of the dynamical magnetic susceptibility χ(q, ω) in the slave-boson mean-field approximation to the two-dimensional t-J model.While the strong spectral weight appears at incommensurate positions, namely at q = Q ≡ (π, π), for low energy, the incommensurate signals disperse with increasing ω and finally merge into a commensurate signal at a particular energy ω = ω Q . These features are seen in both the d-wave pairing state and the normal state. In particular, the incommensurate signals below ω Q in the normal state are due to the Fermi surface geometry, which we expect for La-based cuprates because of a tendency to d-wave type Fermi surface deformations. Above ω Q , strong signals appear to trace an upward dispersion especially for a low doping rate in the d-wave pairing state while typically broad spectral weight is obtained around q = Q in the normal state. Salient features of magnetic excitations in La-based cuprates are thus naturally captured in terms of particle-hole excitations. Global understanding of magnetic excitations in high-T c cuprates is discussed through a comparison with magnetic excitations in YBa 2 Cu 3 O y .

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Structural Transitions and Localization in La_2-x-yNd_ySr_xCuO₄withp∼1/8

Cited by 20 publications

References 16 publications

Evidence for unusual superconducting correlations coexisting with stripe order inLa1.875Ba0.125CuO4

Evidence for unusual superconducting correlations coexisting with stripe order inLa1.875Ba0.125CuO4

Magnetic Excitation oft–JModel with Quasi-One-Dimensional Fermi Surface – Possible Relevance to LSCO Systems

Magnetic excitations in La-based cuprate superconductors: Slave-boson mean-field analysis of the two-dimensionalt−Jmodel

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