Transport properties of stripe-ordered high Tc cuprates

Qi, Jie; Han, Su Jin; Dimitrov, Ivo; Tranquada, J. M.; Li, Qiang

doi:10.1016/j.physc.2012.04.003

Cited by 4 publications

(4 citation statements)

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“…1 CDW in cuprate superconductors were first observed in lanthanum based compounds, [2][3][4] such as La 2−x Ba x CuO 4 (LBCO) around 1/8 hole-doping. 2,[4][5][6][7][8][9][10][11][12] In these La-based cuprates, spin correlations were also found to synchronize with the CDW modulation to form static "stripes" 2 of interlocked CDW and spin density waves (SDW) at a certain temperature below the ordering temperature of the CDW (see Fig. 1).…”

Section: Significance Statementmentioning

confidence: 99%

Disorder raises the critical temperature of a cuprate superconductor

Leroux

Mishra

Ruff

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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With the discovery of charge density waves (CDW) in most members of the cuprate high temperature superconductors, the interplay between superconductivity and CDW has become a key point in the debate on the origin of high temperature superconductivity. Some experiments in cuprates point toward a CDW state competing with superconductivity, but others raise the possibility of a CDW-superconductivity intertwined order, or more elusive pair-density wave (PDW). Here we have used proton irradiation to induce disorder in crystals of La1.875Ba0.125CuO4 and observed a striking 50% increase of Tc accompanied by a suppression of the CDW. This is in sharp contrast with the behavior expected of a d-wave superconductor for which both magnetic and non-magnetic defects should suppress Tc. Our results thus make an unambiguous case for the strong detrimental effect of the CDW on bulk superconductivity in La1.875Ba0.125CuO4. Using tunnel diode oscillator (TDO) measurements, we find indications for potential dynamic layer decoupling in a PDW phase. Our results establish irradiation-induced disorder as a particularly relevant tuning parameter for the many families of superconductors with coexisting density waves, which we demonstrate on superconductors such as the dichalcogenides and Lu5Ir4Si10. Significance statementThe origin of high-temperature superconductivity remains unknown. Over the past two decades, spatial oscillations of the electronic density known as Charge Density Waves (CDW) have been found to coexist with high-temperature superconductivity in most prominent cuprate superconductors. The debate on whether CDW help or hinder high-temperature superconductivity in cuprates is still ongoing. In principle, disorder at the atomic scale should strongly suppress both high-temperature superconductivity and CDW. In this article however, we find that disorder created by irradiation increases the superconducting critical temperature by 50% while suppressing the CDW order, showing that CDW strongly hinder bulk superconductivity. We provide indications this increase occurs because the CDW could be part of a pairdensity wave frustrating the superconducting coupling between atomic planes.Charge density waves (CDW) are real-space periodic oscillations of the crystal electronic density accompanied by a lattice distortion. In their simplest form, CDW can be described as a Bardeen-Cooper-Schrieffer condensate of electron-hole pairs that breaks the translational symmetry. 1 CDW in cuprate superconductors were first observed in lanthanum based compounds, 2-4 such as La 2−x Ba x CuO 4 (LBCO) around 1/8 hole-doping. 2,4-12 In these La-based cuprates, spin correlations were also found to synchronize with the CDW modulation to form static "stripes" 2 of interlocked CDW and spin density waves (SDW) at a certain temperature below the ordering temperature of the CDW (see Fig. 1).More recently, CDW were shown to be a nearly-universal characteristic in cuprates: a CDW was observed in holedoped YBa 2 Cu 3 O 7−δ (YBCO) 13-19 as well as several others ho...

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Section: Significance Statementmentioning

confidence: 99%

Disorder raises the critical temperature of a cuprate superconductor

Leroux

Mishra

Ruff

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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“…Because of the crystal symmetry, the orientation of the stripes rotates 90 • from one layer to the next. The occurrence of maximum stripe order corresponds to a strong suppression of the bulk T c at p ≈ 1 8 [54,57], suggesting that stripe order competes with superconductivity; however, recent studies have demonstrated that 2D superconductivity can coexist with stripe order [58]. It now appears that superconducting order can intertwine with stripe order [59].…”

Section: Application To Cuprate Superconductorsmentioning

confidence: 99%

Neutron Scattering and Its Application to Strongly Correlated Systems

Zaliznyak

Tranquada

2014

Springer Series in Solid-State Sciences

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Abstract. Neutron scattering is a powerful probe of strongly correlated systems. It can directly detect common phenomena such as magnetic order, and can be used to determine the coupling between magnetic moments through measurements of the spin-wave dispersions. In the absence of magnetic order, one can detect diffuse scattering and dynamic correlations. Neutrons are also sensitive to the arrangement of atoms in a solid (crystal structure) and lattice dynamics (phonons). In this chapter, we provide an introduction to neutrons and neutron sources. The neutron scattering cross section is described and formulas are given for nuclear diffraction, phonon scattering, magnetic diffraction, and magnon scattering. As an experimental example, we describe measurements of antiferromagnetic order, spin dynamics, and their evolution in the La2−xBaxCuO4 family of high-temperature superconductors. IntroductionA common symptom of correlated-electron systems is magnetism, and neutron scattering is the premiere technique for measuring magnetic correlations in solids. With a spin angular momentum of 1 2h , the neutron interacts directly with the magnetization density of the solid. Elastic scattering can directly reveal static magnetic order; for example, neutron diffraction provided the first experimental evidence for Néel antiferromagnetism [1]. Through inelastic scattering one can probe dynamic spin-spin correlations; in an ordered antiferromagnet, one can measure the precession of the spins about their average orientations, which show up as dispersing spin waves.Neutrons do not couple to the charge of the electrons, but instead scatter from atomic nuclei via the strong force. Despite the name, the small size of the nucleus compared to the electronic charge cloud of the atom results in a rather weak scattering cross section. The magnetic and nuclear scattering cross sections are comparable, so that neutron scattering is very sensitive to magnetism, in a relative sense.arXiv:1304.4214v1 [cond-mat.str-el]

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“…22 For x = 0.115 at 7 K, the JPR appears near the renormalized superconducting plasma frequency ω′ p = 6.7 cm −1 (200 GHz). The unscreened plasma frequency is given by ω p = ω′ p εitalic∟εitalic∟∼30 giving a superfluid density ρ o ≡ ω p 2 = 1.3 × 10 3 cm −2 (This is taken to be very near the superfluid density at T = 0 K.) The conductivity just above T c = 13 K is taken as σ dc ∼ 0.8 Ω −1 ⋅cm −1 , estimated from transport measurements on a similar doping of x = 0.11 (24). As seen in Fig.…”

mentioning

confidence: 99%

“…The unscreened plasma frequency is given by ωp = ω'p ( ) giving a superfluid density ρo ≡ ωp 2 = 1.3 x 10 3 cm -2 (This is taken to be very near the superfluid density at T = 0 K). The conductivity just above Tc = 13 K is taken as σdc ~ 0.8 Ω -1 cm -1 , estimated from transport measurements on a similar doping of x = 0.11 24 . As seen in Fig.…”

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confidence: 99%

Photoenhanced metastable c-axis electrodynamics in stripe-ordered cuprate La _1.885 Ba _0.115 CuO ₄

Cremin

Zhang

Homes

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Quantum materials are amenable to nonequilibrium manipulation with light, enabling modification and control of macroscopic properties. Light-based augmentation of superconductivity is particularly intriguing. Copper-oxide superconductors exhibit complex interplay between spin order, charge order, and superconductivity, offering the prospect of enhanced coherence by altering the balance between competing orders. We utilize terahertz time-domain spectroscopy to monitor the c-axis Josephson plasma resonance (JPR) in La2−xBaxCuO4 (x = 0.115) as a direct probe of superconductivity dynamics following excitation with near-infrared pulses. Starting from the superconducting state, c-axis polarized excitation with a fluence of 100 μJ/cm2 results in an increase of the far-infrared spectral weight by more than an order of magnitude as evidenced by a blueshift of the JPR, interpreted as resulting from nonthermal collapse of the charge order. The photoinduced signal persists well beyond our measurement window of 300 ps and exhibits signatures of spatial inhomogeneity. The electrodynamic response of this metastable state is consistent with enhanced superconducting fluctuations. Our results reveal that La2−xBaxCuO4 is highly sensitive to nonequilibrium excitation over a wide fluence range, providing an unambiguous example of photoinduced modification of order-parameter competition.

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Transport properties of stripe-ordered high Tc cuprates

Cited by 4 publications

References 110 publications

Disorder raises the critical temperature of a cuprate superconductor

Disorder raises the critical temperature of a cuprate superconductor

Neutron Scattering and Its Application to Strongly Correlated Systems

Photoenhanced metastable c-axis electrodynamics in stripe-ordered cuprate La _1.885 Ba _0.115 CuO ₄

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Transport properties of stripe-ordered high Tc cuprates

Cited by 4 publications

References 110 publications

Disorder raises the critical temperature of a cuprate superconductor

Disorder raises the critical temperature of a cuprate superconductor

Neutron Scattering and Its Application to Strongly Correlated Systems

Photoenhanced metastable c-axis electrodynamics in stripe-ordered cuprate La 1.885 Ba 0.115 CuO 4

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Photoenhanced metastable c-axis electrodynamics in stripe-ordered cuprate La _1.885 Ba _0.115 CuO ₄