Quantum Criticality Stabilizes High T c Superconductivity Against Competing Symmetry-Breaking Instabilities

Ashkenazi, J.; Johnson, Neil F.

doi:10.1007/s10948-013-2145-0

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…In this way, scale invariant textures have been observed in lattice, spin, and charge degrees of freedom in strongly correlated oxide perovskites [16][17][18][19][20][21] and at metal-insulator transitions [22]. These results have shown that scale invariance [23,24] in granular matter near a critical point has been favoring quantum coherence in high-temperature superconductivity [25][26][27][28][29]. Lattice complexity beyond the average crystalline structure effects in the mechanism of high Tc superconductivity at optimum doping is attracting high interest.…”

Section: Introductionmentioning

confidence: 99%

Scale-Free Distribution of Oxygen Interstitial Wires in Optimum-Doped HgBa2CuO4+y

et al. 2022

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Novel nanoscale probes are opening new venues for understanding unconventional electronic and magnetic functionalities driven by multiscale lattice complexity in doped high-temperature superconducting perovskites. In this work, we focus on the multiscale texture at supramolecular level of oxygen interstitial (O-i) atomic stripes in HgBa2CuO4+y at optimal doping for the highest superconducting critical temperature (TC) of 94 K. We report compelling evidence for the nematic phase of oxygen interstitial O-i atomic wires with fractal-like spatial distribution over multiple scales using scanning micro- and nano-X-ray diffraction. The scale-free distribution of O-i atomic wires at optimum doping extending from the micron down to the nanoscale has been associated with the intricate filamentary network of hole-rich metallic wires in the CuO2 plane. The observed critical opalescence provides evidence for the proximity to a critical point that controls the emergence of high-temperature superconductivity at optimum doping.

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Section: Introductionmentioning

confidence: 99%

Scale-Free Distribution of Oxygen Interstitial Wires in Optimum-Doped HgBa2CuO4+y

et al. 2022

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“…28NiO 4 , using the combination of the resonant X-ray Scattering (RXS) and XPCS. This could provide important information on the CDW nanoscale dynamic in complex material characterized by nanoscale phase separation.The physics of complex materials and the emerging coherent macroscopic state like superconductivity is still an open problem [1,2]. In particular, the interplay between the Charge-Density-Wave (CDW), the SpinDensity-Wave (SDW) and the defects ordering is under an intense discussion [3,4].…”

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confidence: 99%

Nanoscale Dynamics in Complex Materials by Resonant X-Ray Photon Correlation Spectroscopy (rXPCS)

Ricci

2014

J Supercond Nov Magn

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Complex materials are characterized by a competition between multiple phases that coexist in a nanoscale phase separation scenario. In particular there is a growing interest in understanding how the competition between Charge-Density-Wave (CDW), the Spin-Density-Wave (SDW) and the defects puddles promotes the material's functionality at the macroscopic scale. For this reason the finding of a new technique that could combine temporal and spatial resolution with bulk sensitivity, is extremely important. A good solution could arrive by the use of a time-resolved scattering technique like X-ray Photon Correlation Spectroscopy (XPCS). As example of possible application we propose the study of CDW nanoscale dynamic, in a simple system like La 1.72 Sr 0. 28NiO 4 , using the combination of the resonant X-ray Scattering (RXS) and XPCS. This could provide important information on the CDW nanoscale dynamic in complex material characterized by nanoscale phase separation.The physics of complex materials and the emerging coherent macroscopic state like superconductivity is still an open problem [1,2]. In particular, the interplay between the Charge-Density-Wave (CDW), the SpinDensity-Wave (SDW) and the defects ordering is under an intense discussion [3,4]. Indeed there is a strong interest in understanding how the competition, between these phases forming puddles, plays a key role in the promotion of the material's functionality at the macroscopic scale.It is known that the macroscopic properties of complex materials can be tuned by external fields or temperature [5]. These processes occur not via a complete phase transition but, by a spatial rearrangement of the puddles of different coexisting phases. For example the macroscopic metallic behavior, can be obtained via a percolation of metallic domains embedded into an insulating matrix. Even the colossal magnetoresistance (CMR) has been predicted to be due by the competition between different phases forming a nanoscale phase separation scenario [6].In order to clarify the phase's coexistence it is important to understand their spatial organization. Up to now only few works point the attention to the visualization of how SDW, CDW and defects puddles are organized. Moreover most of them just probe the local electronic structure using scanning probe techniques [7] or absorption spectroscopy [8][9][10], which are limited to the surface layer only, whose properties may deviate from the bulk considerably. On this purpose an important solution came from the use of innovative techniques like scanning micro X-ray diffraction (SµXRD) and resonant scanning micro X-ray diffraction (rSµXRD) that allow to directly visualize the bulk spatial organization of the SDW, CDW and defects puddles. Indeed by the use of SµXRD on several High temperature superconductors (HTS) it has been possible to directly visualize a complex nanoscale phase separation characterized by the coexistence of competing granular networks of different puddles [11][12][13][14][15][16][17][18][19][20][21] forming a ...

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Fe–As Bond-Dynamics Revealed from the Arsenic K-Edge EXAFS Studies of NdFeAsO1−x F x Iron-Pnictide Superconductors

Joseph

2013

J Supercond Nov Magn

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Quantum Criticality Stabilizes High T c Superconductivity Against Competing Symmetry-Breaking Instabilities

Cited by 3 publications

References 43 publications

Scale-Free Distribution of Oxygen Interstitial Wires in Optimum-Doped HgBa2CuO4+y

Scale-Free Distribution of Oxygen Interstitial Wires in Optimum-Doped HgBa2CuO4+y

Nanoscale Dynamics in Complex Materials by Resonant X-Ray Photon Correlation Spectroscopy (rXPCS)

Fe–As Bond-Dynamics Revealed from the Arsenic K-Edge EXAFS Studies of NdFeAsO1−x F x Iron-Pnictide Superconductors

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