Two-Dimensional Superconducting Fluctuations in Stripe-Ordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>1.875</mml:mn></mml:msub><mml:msub><mml:mi>Ba</mml:mi><mml:mn>0.125</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

Li, Qiang; Hücker, M.; Gu, Genda; Tsvelik, A. M.; Tranquada, J. M.

doi:10.1103/physrevlett.99.067001

Cited by 340 publications

(433 citation statements)

References 23 publications

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“…4b) is reminiscent of the cases in other superconducting cuprates 11,12 . The existence of precursor pairing in the normal state of LBCO-1/8 is further supported by recent transport measurements 28 . A precipitous drop in the in-plane resistivity at T 2D ∼ 40 K, where the concurrent stripe (as a density wave) formation would often result in an increase of resistivity, implies an onset of superconducting fluctuations.…”

supporting

confidence: 57%

Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4

Tanaka

et al. 2008

Nature Phys

104

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A central issue in high-T c superconductivity is the nature of the normal-state gap (pseudogap) 1 in the underdoped regime and its relationship with superconductivity. Despite persistent efforts, theoretical ideas for the pseudogap evolve around fluctuating superconductivity 2 , competing order 3-8 and spectral weight suppression due to many-body effects 9 . Recently, although some experiments in the superconducting state indicate a distinction between the superconducting gap and pseudogap 10-14 , others in the normal state, either by extrapolation from high-temperature data 15 The first high-T c superconductor discovered, La 2−x Ba x CuO 4 (LBCO), holds a unique position in the field because of an anomalously strong bulk T c suppression near x = 1/8. Right around this 'magic' doping level, scattering experiments by neutrons 18,19 and X-rays 20 find a static spin and charge (stripe) order. By itself, this observation raises a series of intriguing questions: whether the stripe order is a competing order that suppresses the superconductivity in LBCO-1/8; if the answer is positive, which aspect, the pairing strength or the phase coherence, is involved in the T c suppression and how this mechanism applies to other dopings or families. For our investigation of the 'ground-state' pseudogap, as defined in ref. 16, which ignores the residual superconductivity, its sufficiently high doping yet extremely low bulk T c (∼4 K) makes LBCO-1/8 an ideal system: especially for the small-gap measurement near the node, difficulties due to either the unscreened disorder potential, a problem for extremely low doping, or trivial thermal broadening, a problem above T c for higher doping, are circumvented.Whereas thermal effects require an extrapolation from high-temperature data to obtain the ground-state physics 15 , a direct measurement on LBCO-1/8 at low temperature has been made 16 . With experimental resolutions compromised to obtain sufficient signal to noise, a simple d-wave gap function is reported with no discernible nodal quasi-particles found. Given the importance of this issue, we have carried out an angle-resolved photoemission 21 study of LBCO-1/8 at T > T c with much improved resolutions in a measurement geometry favourable for the detection of nodal quasi-particles (see Fig. 1 and Supplementary Information, Section SI). Our data provide two important new insights. First, there is a well-defined nodal quasi-particle peak, suggesting nodal quasi-particles can exist in the stripe-ordered state. Second, there is a rich gap structure, suggesting the pseudogap physics is more elaborate than the simple d-wave version. In particular, a new kind of pseudogap, which is not smoothly connected to the usual one tied to the antinodal region, can exist in the nodal region when superconductivity is suppressed owing to the loss of phase coherence.As shown in Fig. 1, there exists a well-defined quasi-particle peak in the energy distribution curves (EDCs) at the Fermi crossing points (k F ) around the node. On dispersion towards the ant...

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supporting

confidence: 57%

Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4

Tanaka

et al. 2008

Nature Phys

104

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“…Because the orientation of the stripe order rotates by π/2 from one layer to the next, the formation of the stripe order is thought to electronically decouple the CuO 2 planes, leading to 2D superconductivity. 39 This is probably due to the strong pinning of the vortex. Consequently, the parallel-shiftlike behavior observed at high fields may be the combined effect of the broadening at high temperatures due to the extreme 2D nature and the sharp drop at low temperatures due to vortex pinning.…”

Section: Resultsmentioning

confidence: 99%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

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To investigate the relationship between the pseudogap and superconductivity, we measured both the in-plane (ρ ab ) and out-of-plane (ρ c ) resistivity for oxygen-controlled Bi 2 Sr 2 CaCu 2 O 8+δ single crystals subject to magnetic fields (parallel to the c axis) of up to 17.5 T. The onset temperature for the superconductive fluctuation, T sc f , is determined by the large positive in-plane magnetoresistance (MR) and negative out-of-plane MR observed near T c , whereas the pseudogap opening temperature T * is determined by the semiconductive upturn of the zero-field ρ c . T sc f was found to scale roughly as T c , with a decreasing temperature interval between them upon doping. On the other hand, T * starts out much higher than T sc f but decreases monotonically upon doping; finally, at a heavily overdoped state, it is not observed above T sc f . These results imply that the pseudogap is not a simple precursor of superconductivity, but that further study is needed to determine whether or not T * exists below T sc f in the heavily overdoped state.

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“…Apart from the above-described modifications, we performed a rather standard NQR experiment with a single crystal sample of LBCO-1/8 extensively used and characterized in previous work 1,2,30 . The measurements were made in a variable-temperature inset of a 12 T Oxford superconducting magnet, with the sample mounted on a sapphire holder to minimize heating from currents induced in the (conductive) sample by the RF pulses used in NMR/NQR.…”

Section: Methodsmentioning

confidence: 99%

“…Yet some issues remain unresolved, and the technique is still capable of providing fresh information on the local electronic physics in the cuprates. Recently, charge and spin stripe order has emerged as one of the crucial ingredients of the cuprate phenomenology [1][2][3][4][5][6][7] , and NMR in these ordered phases has once more come into focus. In the yttrium-123 (YBCO) family, copper NMR has provided direct evidence of a commensurate charge stripe ordering at high magnetic fields [8][9][10] , while lanthanum NMR in the 214 family (La 2−x Sr x CuO 4 -LSCO, La 2−x Ba x CuO 4 -LBCO, La 2−x−y Eu y Sr x CuO 4 -LESCO and similar) detects the influence of stripe-related fluctuations [11][12][13][14]16 .…”

Section: Introductionmentioning

confidence: 99%

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

Pelc¹,

Grafe²,

Gu³

et al. 2017

Phys. Rev. B

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We present a Cu nuclear magnetic/quadrupole resonance study of the charge stripe ordered phase of LBCO, with detection of previously unobserved ('wiped-out') signal. We show that spin-spin and spin-lattice relaxation rates are strongly enhanced in the charge ordered phase, explaining the apparent signal decrease in earlier investigations. The enhancement is caused by magnetic, rather than charge fluctuations, conclusively confirming the long-suspected assumption that spin fluctuations are responsible for the wipeout effect. Observation of the full Cu signal enables insight into the spin and charge dynamics of the stripe-ordered phase, and measurements in external magnetic fields provide information on the nature and suppression of spin fluctuations associated with charge order. We find glassy spin dynamics, in agreement with previous work, and incommensurate static charge order with charge modulation amplitude similar to other cuprate compounds, suggesting that the amplitude of charge stripes is universal in the cuprates.

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Two-Dimensional Superconducting Fluctuations in Stripe-OrderedLa1.875Ba0.125CuO4

Cited by 340 publications

References 23 publications

Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4

Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

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Two-Dimensional Superconducting Fluctuations in Stripe-OrderedLa1.875Ba0.125CuO4

Cited by 340 publications

References 23 publications

Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4

Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

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Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements