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Kohsaka, Y.; Iwaya, Katsuya; Satow, S.; Hanaguri, T.; Azuma, Masaki; Takano, Mikio; Takagi, H.

doi:10.1103/physrevlett.93.097004

Cited by 84 publications

(83 citation statements)

References 24 publications

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“…However, the absence of a dip in the polarization function at the lowest times indicates the presence of a large number of low field sites -superconducting and magnetic regions intercalated on a microscopic (≤ 2 nm) scale [8,9,14,21]. These observations suggest the presence of magnetic stripes/droplets, in agreement with independent indications [4,8,9,10,11,13,14,21] from transport and spectroscopic studies for the nonsuperconducting dopings. From these studies we may conclude that superconductivity coexists with glassiness on a microscopic scale throughout the bulk of the material.…”

supporting

confidence: 81%

Self-generated electronic heterogeneity and quantum glassiness in the high-temperature superconductors

Panagopoulos

Dobrosavljević

2005

Phys. Rev. B

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We present a systematic study of the spin and charge dynamics of copper oxide superconductors as a function of carrier concentration x. Our results portray a coherent physical picture, which reveals a quantum critical point at optimum doping (x = xopt), and the formation of an inhomogeneous glassy state at x < xopt. This mechanism is argued to arise as an intrinsic property of doped Mott insulators, and therefore to be largely independent of material quality and level of disorder.Many interesting materials ranging from magnetorestrictive manganite films [1] and field-effect transistors [2,3], to unconventional low dimensional superconductors [4], find themselves close to the metal-insulator transition. In this regime, competition between several distinct ground states [4] produces unusual behavior, displaying striking similarities in a number of different systems. Electronic heterogeneity [1,5] emerges, giving rise to "mesoscopic" coexistence of different ordered phases. Typically, a large number of possible configurations of these local regions have comparable energies, resulting in slow relaxation, aging, and other signatures of glassy systems. Because the stability of such ordering is controlled by doping-dependent quantum fluctuations [6,7] introduced by itinerant carriers, these systems can be regarded as prototypical quantum glasses -a new paradigm of strongly correlated matter.In this Letter we report the emergence and evolution of dynamical heterogeneity and glassy behavior across the phase diagram of the high-transition-temperature (T c ) superconductors (HTS). Based on data of the spin and charge dynamics, we draw a phase diagram (Fig. 1) and propose that self generated glassiness [5] may be a key feature necessary to understand many of the unconventional properties of both the superconducting and the normal state.Glassiness in the pseudo-gap phase. In the archetypal HTS, La 2−x Sr x CuO 4 (LSCO) the parent 2D antiferromagnetic insulator (AFI) La 2 CuO 4 displays a sharp peak in the magnetic susceptibility at the Neel temperature T N = 300K. T N decreases with hole-doping and the transition width broadens (Fig. 2 -upper panel). Concurrently, there is systematic experimental evidence from various techniques and on several HTS that a second freezing transition (T F ) emerges at lower temperatures with the first added holes (Fig. 2) [8,9,10,11,12,13]. At x > 0.02, T N = 0 but the short range order persists [14]: the low-field susceptibility displays a cusp at low temperatures and a thermal hysteresis below, characteristic of a spin glass transition (T g ) (Fig. 2 -upper panel). At T < T g the material displays memory effects like "traditional" spin glasses and is described by an Edwards-Anderson order parameter [15]. Interestingly, it is at this doping range that a pseudogap phase develops [4,16].

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supporting

confidence: 81%

Self-generated electronic heterogeneity and quantum glassiness in the high-temperature superconductors

Panagopoulos

Dobrosavljević

2005

Phys. Rev. B

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“…1. The presented CVC pattern for this highly symmetric junction undoubtedly demonstrates the availability of a nonsymmetric contribution of unknown nature and magnitude, although the non-symmetricity is much less than in the case of truly nonsymmetric junctions [2,7,18,23,26]. One can see well-developed dip-hump structures beyond the coherent superconducting peaks.…”

Section: Experimental Partmentioning

confidence: 85%

“…Since we assume a symmetric junction, the calculated superconducting coherent peaks in all demonstrated figures turned out equal by height. Different experimental peak heights may be due to the experimental uncertainties and the differentiation of raw data, J V ( ), the latter being already averaged over various patches of the cuprate surface [17,26]. Of course, such a disparity varies from measurement to measurement at random.…”

mentioning

confidence: 99%

Analysis of the pseudogap-related structure in the tunnel spectra of superconducting Bi2Sr2CaCu2O8+δ revealed by break-junction technique

Ekino

Gabovich

Войтенко

2008

Low Temperature Physics

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Tunnel conductance G V( ) for break-junctions made of as-grown single-crystal Bi 2 Sr 2 CaCu 2 O 8+d samples with T c » -86 89 K was measured and clear-cut dip-hump structures (DHSs) were found in the range 80 120 -mV of the bias voltage V . The theory of tunneling in symmetric junctions between inhomogeneous charge-density-wave (CDW) superconductors, considered in the framework of the s-pairing model, has been developed. CDWs have been shown to be responsible for the appearance of the DHS in the tunnel current-voltage characteristics and properly describes experimental results.

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“…1,8,9 STS has revealed that the cuprates have a spatially inhomogeneous electronic structure, including modulations in the LDOS and superconducting gap magnitude. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] In the d-wave superconducting phase, the LDOS modulations can arise from quasiparticle interference (QPI), due to the scattering of wave-like quasiparticles off impurities. 12,15,22,[25][26][27] The wavevectors of the modulations can be determined from the Fourier transform of the LDOS.…”

Section: Introductionmentioning

confidence: 99%

Quasiparticle interference and the interplay between superconductivity and density wave order in the cuprates

2012

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Scanning tunneling spectroscopy (STS) is a useful probe for studying the cuprates in the superconducting and pseudogap states. Here we present a theoretical study of the Z-map, defined as the ratio of the local density of states at positive and negative bias energies, which frequently is used to analyze STS data. We show how the evolution of the quasiparticle interference peaks in the Fourier transform Z-map can be understood by considering different types of impurity scatterers, as well as particle-hole asymmetry in the underlying bandstructure. We also explore the effects of density wave orders, and show that the Fourier transform Z-map may be used to both detect and distinguish between them.

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Imaging Nanoscale Electronic Inhomogeneity in the Lightly Doped Mott InsulatorCa2−xNax

Cited by 84 publications

References 24 publications

Self-generated electronic heterogeneity and quantum glassiness in the high-temperature superconductors

Self-generated electronic heterogeneity and quantum glassiness in the high-temperature superconductors

Analysis of the pseudogap-related structure in the tunnel spectra of superconducting Bi2Sr2CaCu2O8+δ revealed by break-junction technique

Quasiparticle interference and the interplay between superconductivity and density wave order in the cuprates

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