The Ancient Romans’ Route to Charge Density Waves in Cuprates

Caprara, S.

doi:10.3390/condmat4020060

Cited by 11 publications

(11 citation statements)

References 84 publications

(112 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, we have reported new information on the quantum complex scenario near criticality in nickelates which opens new venues to applications and developments of new magnetic and electronic devices. In fact, in the proximity of a topological Lifshitz transition it is possible to control novel macroscopic functionalities by a weak external stimulus such as stress [25][26][27][28][29][30][31][32][33][34][35][36][71][72][73][74][75], current density [64,65] or photon illumination dose [5,[76][77][78][79].…”

Section: Discussionmentioning

confidence: 99%

Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4

et al. 2019

View full text Add to dashboard Cite

In several strongly correlated electron systems, the short range ordering of defects, charge and local lattice distortions are found to show complex inhomogeneous spatial distributions. There is growing evidence that such inhomogeneity plays a fundamental role in unique functionality of quantum complex materials. La 1.72 Sr 0.28 NiO 4 is a prototypical strongly correlated perovskite showing spin stripes order. In this work we present the spatial distribution of the spin order inhomogeneity by applying micro X-ray diffraction to La 1.72 Sr 0.28 NiO 4 , mapping the spin-density-wave order below the 120 K onset temperature. We find that the spin-density-wave order shows the formation of nanoscale puddles with large spatial fluctuations. The nano-puddle density changes on the microscopic scale forming a multiscale phase separation extending from nanoscale to micron scale with scale-free distribution. Indeed spin-density-wave striped puddles are disconnected by spatial regions with negligible spin-density-wave order. The present work highlights the complex spatial nanoscale phase separation of spin stripes in nickelate perovskites and opens new perspectives of local spin order control by strain.Condens. Matter 2019, 4, 77 2 of 10 the stripes phases have been the object of interest for decades [1][2][3], while in this last decade new scanning X-ray diffraction methods have been developed due to the ability to focus X-ray synchrotron radiation to micron and sub-micron spots. These methods have made it possible to obtain visualization of spatial topological inhomogeneity of charge density wave order in doped cuprate perovskites [4,5]. Short range generalized Wigner charge density waves have been found to be spatially inhomogeneous with the formation of "striped charge puddles" anti-correlated with competing puddles of "striped dopants rich clusters" [4][5][6]. These experimental results have opened a new era in the long-standing research of complexity in doped strongly correlated perovskites, since they have falsified popular stripes theories which for decades have assumed a homogeneous spatial distribution of spin stripes and charge-stripes. In this work we focus on the spin stripes phase in doped nickelate perovskites. In order to determine the role that the spatial distribution of ordered phases in cuprates plays for the superconductivity, it is instructive to study a non-superconducting reference system like the layered nickelates [7]. Keeping this idea in mind, we push forward the investigation of the spatial distribution of spin-density-wave stripes ordering (SDW-stripes) in La 2-x Sr x NiO 4 nickelates.It is well known that spin stripes appear in layered nickelates [7] in the doping interval 0.15 ≤ x ≤ 0.5 [7]. In the doping range 0.25 < x < 0.3 magnetic stripes and charge stripes can be easily investigated separately. In La 2-x Sr x NiO 4 the spin-order scattering exhibits peaks in the k-space for (1−ε; 0; l) with odd and even l, whereas charge-order scattering always peaks at (2ε; 0; l) with odd l, [7,8] where t...

show abstract

Section: Discussionmentioning

confidence: 99%

Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4

et al. 2019

View full text Add to dashboard Cite

show abstract

“…At Superstripes 2019 Tsuchiya et al [87] and Nakagawa et al, [88] have reported the most recent results on the investigation of carrier dynamics and phase separation by spectrally resolved pump-probe spectroscopy and polarized time-resolved spectroscopy of electronic phase separation. Arrested nanoscale phase separation was predicted for multiband correlated metals near a topological Lifshitz transition [89] which is reached by tuning strain and charge [90] with a complex landscape of polaronic short range charge density waves [91].…”

Section: The Superstripes 2019 Conferencementioning

confidence: 99%

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Bianconi

2020

J Supercond Nov Magn

View full text Add to dashboard Cite

While in XX century the theory of superconductivity has focused on a homogeneous metal with a rigid lattice which can be reduced to a single effective conduction band in the dirty limit. Today in the XXI century, the physics of superconductivity is focusing on complexity of quantum matter where novel quantum functionalities with lattice inhomogeneity at nanoscale (between 1 nm and 100 nm) and at mesoscopic scale (in the range 100-10000 nm), where the electronic structure need to be described by multiple Fermi surfaces and multiple gaps in the superconducting phase in the clean limit. The present issue of Journal of superconductivity and Novel magnetism collects papers presented at the

show abstract

“…A special case of the Hamiltonian Equation (1) is realized by the steep band/flat band scenario [11][12][13][14][15][16][55][56][57][58][59][60][61]. This corresponds to a band with itinerant Fermi liquid type character and a localized dispersion-less polaronic one [5][6][7][8]30,[62][63][64][65][66][67]…”

Section: The Steep Band/flat Band Modelmentioning

confidence: 99%

Multi-Band Superconductivity and the Steep Band/Flat Band Scenario

et al. 2019

View full text Add to dashboard Cite

The basic features of multi-band superconductivity and its implications are derived. In particular, it is shown that enhancements of the superconducting transition temperature take place due to interband interactions. In addition, isotope effects differ substantially from the typical BCS scheme as soon as polaronic coupling effects are present. Special cases of the model are polaronic coupling in one band as realized e.g., in cuprates, coexistence of a flat band and a steep band like in MgB2, crossovers between extreme cases. The advantages of the multiband approach as compared to the single band BCS model are elucidated and its rather frequent realization in actual systems discussed.

show abstract

The Ancient Romans’ Route to Charge Density Waves in Cuprates

Cited by 11 publications

References 84 publications

Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4

Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Multi-Band Superconductivity and the Steep Band/Flat Band Scenario

Contact Info

Product

Resources

About