Field-induced local moments around nonmagnetic impurities in metallic cuprates

Gabay, M.; Semel, E.; Hirschfeld, P. J.; Chen, W.

doi:10.1103/physrevb.77.165110

Cited by 9 publications

(15 citation statements)

References 41 publications

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“…(1)(b)) in an almost-localized host. A somewhat similar result emerges in the t−t ′ −J model, in which an impurity induces a local staggered magnetization in its vicinity [17,18] whose spatial extent also increases with correlations. The critical behavior of δZ i is captured by our analytical expressions and we can show that, for d ≥ 2, and r io /ξ ≫ 1…”

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confidence: 60%

Quantum Ripples in Strongly Correlated Metals

2010

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We study how well-known effects of the long-ranged Friedel oscillations are affected by strong electronic correlations. We first show that their range and amplitude are significantly suppressed in strongly renormalized Fermi liquids. We then investigate the interplay of elastic and inelastic scattering in the presence of these oscillations. In the singular case of two-dimensional systems, we show how the anomalous ballistic scattering rate is confined to a very restricted temperature range even for moderate correlations. In general, our analytical results indicate that a prominent role of Friedel oscillations is relegated to weakly interacting systems.

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confidence: 60%

Quantum Ripples in Strongly Correlated Metals

2010

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“…To compensate it, Wang and Lee added a phenomenological residual spin-spin interaction term, and the result depends on its magnitude. In addition, Gabay et al 20 recently obtained similar results. Liang and Lee 21 applied the VMC and also concluded that local moments appear in the underdoped regime.…”

Section: Introductionmentioning

confidence: 63%

Impurity potential renormalization by strong electron correlation

2009

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Renormalization of non-magnetic impurity potential by strong electron correlation is investigated in detail. We adopt the t-t ′ -t ′′ -J model and consider mainly a δ-function impurity potential. The variational Monte Carlo method shows that impurity potential scattering matrix elements between Gutzwiller-projected quasi-particle excited states are as strongly renormalized as the hopping terms. Such renormalization is also seen by the Bogoliubov-de Gennes equation with an impurity, where the strong correlation is treated by a Gutzwiller mean-field theory with local renormalization factors and local chemical potentials. Namely, the δ-function potential is effectively weakened and broadened. We emphasize the importance of including the local chemical potential, which is paid little attention to in the literature, by physical consideration of the doping dependence of a local hole density. We also investigate effect of smooth impurity potential variation; the strong correlation yields anticorrelation between the gap energy and the coherence peak height simultaneously with large gap distribution, which is consistent with the experiments.

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“…From the theoretical side, we have included strong electronic correlations only in a very phenomenological way, by introducing local suppressions of the hole mobility around the impurity site, as found by more sophisticated treatments in the normal state. 39 As these effects appear to be important, theoretical treatments of impurities in the superconducting state capable of treating inhomogeneous order parameter situations together with strong correlations are clearly desirable. On the experimental side, we have discussed ways in which improving statistics on impurity resonances and how they are defined could provide important insights, and proposed various tests of the scenarios treated here which should enable one to distinguish them.…”

Section: Discussionmentioning

confidence: 99%

Extinction of impurity resonances in large-gap regions of inhomogeneousd-wave superconductors

2008

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Impurity resonances observed by scanning tunneling spectroscopy in the superconducting state have been used to deduce properties of the underlying pure state. Here we study a longstanding puzzle associated with these measurements, the apparent extinction of these resonances for Ni and Zn impurities in large-gap regions of the inhomogeneous Bi2Sr2CaCu2O8+x superconductor. We calculate the effect of order parameter and hopping suppression near the impurity site, and find that these two effects are sufficient to explain the missing resonances in the case of Ni. There are several possible scenarios for the extinction of the Zn resonances, which we discuss in turn; in addition, we propose measurements which could distinguish among them.

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Field-induced local moments around nonmagnetic impurities in metallic cuprates

Cited by 9 publications

References 41 publications

Quantum Ripples in Strongly Correlated Metals

Quantum Ripples in Strongly Correlated Metals

Impurity potential renormalization by strong electron correlation

Extinction of impurity resonances in large-gap regions of inhomogeneousd-wave superconductors

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