Cuprate phase diagram and the influence of nanoscale inhomogeneities

Zaki, Nader; Yang, Hongbo; Rameau, J. D.; Johnson, P. D.; Claus, H.; Hinks, D. G.

doi:10.1103/physrevb.96.195163

Cited by 20 publications

(15 citation statements)

References 49 publications

(66 reference statements)

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“…tronic states to participate in the coherent superconducting state. This perspective is consistent with the idea that the pseudogap detected by ARPES is a consequence of AF correlations [86]. Furthermore, all of the cuprates for which quantum oscillations have been observed in high magnetic fields [87][88][89] have large spin gaps [90], consistent with sharp quasiparticles at energies close to the chemical potential.…”

Section: Discussionsupporting

confidence: 88%

Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates

Li¹,

Zhong²,

Stone³

et al. 2018

Phys. Rev. B

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Motivated by recent attention to a potential antiferromagnetic quantum critical point at xc ∼ 0.19, we have used inelastic neutron scattering to investigate the low-energy spin excitations in crystals of La2−xSrxCuO4 bracketing xc. We observe a peak in the normal-state spin-fluctuation weight at ∼ 20 meV for both x = 0.21 and 0.17, inconsistent with quantum critical behavior. The presence of the peak raises the question of whether low-energy spin fluctuations limit the onset of superconducting order. Empirically evaluating the spin gap ∆spin in the superconducting state, we find that ∆spin is equal to the coherent superconducting gap ∆c determined by electronic spectroscopies. To test whether this is a general result for other cuprate families, we have checked through the literature and find that ∆c ≤ ∆spin for cuprates with uniform d-wave superconductivity. We discuss the implications of this result.

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Section: Discussionsupporting

confidence: 88%

Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates

Li¹,

Zhong²,

Stone³

et al. 2018

Phys. Rev. B

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show abstract

“…Such effects have already been explored for some systems, especially the colossal magnetoresistive manganites 30 , but should be relevant for perovskite-based materials in general, be they bulk superconductors, ferromagnets, ferroelectrics, or films/heterostructures 33 . This insight is already beginning to be applied to the analysis of experiments on cuprates 9,20,21,34,35 . In Supplementary Fig.…”

Section: Discussionmentioning

confidence: 98%

Universal superconducting precursor in three classes of unconventional superconductors

Pelc

Anderson

et al. 2019

Nat Commun

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A pivotal challenge posed by unconventional superconductors is to unravel how superconductivity emerges upon cooling from the generally complex normal state. Here, we use nonlinear magnetic response, a probe that is uniquely sensitive to the superconducting precursor, to uncover remarkable universal behaviour in three distinct classes of oxide superconductors: strontium titanate, strontium ruthenate, and the cuprate high- T c materials. We find unusual exponential temperature dependence of the diamagnetic response above the transition temperature T c , with a characteristic temperature scale that strongly varies with T c . We correlate this scale with the sensitivity of T c to local stress and show that it is influenced by intentionally-induced structural disorder. The universal behaviour is therefore caused by intrinsic, self-organized structural inhomogeneity, inherent to the oxides’ perovskite-based structure. The prevalence of such inhomogeneity has far-reaching implications for the interpretation of electronic properties of perovskite-related oxides in general.

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“…We then simply convolute the density of states with a gap distribution function, and employ the standard BCS temperature dependence for the gaps. Notably, a similar procedure was recently used to model ARPES data 76 in Bi 2 Sr 2 CaCu 2 O 8+y. A Gaussian gap distribution with mean ∆ m = 9.6 meV and full width at half maximum ∆ 0 = 3.2 meV (in line with ref.…”

Section: Methodsmentioning

confidence: 99%

Emergence of superconductivity in the cuprates via a universal percolation process

Pelc¹,

Vučković²,

Grbić³

et al. 2018

Nat Commun

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A pivotal step toward understanding unconventional superconductors would be to decipher how superconductivity emerges from the unusual normal state. In the cuprates, traces of superconducting pairing appear above the macroscopic transition temperature Tc, yet extensive investigation has led to disparate conclusions. The main difficulty has been to separate superconducting contributions from complex normal-state behaviour. Here we avoid this problem by measuring nonlinear conductivity, an observable that is zero in the normal state. We uncover for several representative cuprates that the nonlinear conductivity vanishes exponentially above Tc, both with temperature and magnetic field, and exhibits temperature-scaling characterized by a universal scale Ξ0. Attempts to model the response with standard Ginzburg-Landau theory are systematically unsuccessful. Instead, our findings are captured by a simple percolation model that also explains other properties of the cuprates. We thus resolve a long-standing conundrum by showing that the superconducting precursor in the cuprates is strongly affected by intrinsic inhomogeneity.

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Cuprate phase diagram and the influence of nanoscale inhomogeneities

Cited by 20 publications

References 49 publications

Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates

Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates

Universal superconducting precursor in three classes of unconventional superconductors

Emergence of superconductivity in the cuprates via a universal percolation process

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