Nanoscale Phase Separation of Incommensurate and Quasi-Commensurate Spin Stripes in Low Temperature Spin Glass of La2−xSrxNiO4

Campi, Gaetano; Bianconi, A.; Ricci, Alessandro

doi:10.3390/condmat6040045

Cited by 3 publications

(4 citation statements)

References 91 publications

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“…We performed SµXRD measurements on the P10 beamline of the PETRA III synchrotron. The spatial distribution of the CDW peak incommensurability, η 19 , 35 and the in-plane coherence length, ξ a , have been calculated as described in “ Methods ”, and visualized over areas of 66 × 100 μm 2 in steps of 2 μm in both directions. Maps collected by scanning over the same sample area in the low temperature region at T = 30 K, T = 50 K and T = 65 K are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Inhomogeneity of charge density waves (CDW) in doped perovskites based on copper 1 – 14 and nickel 15 – 35 is today of high increasing interest for understanding the intrinsic disorder in quantum complex matter 36 – 49 which control emerging quantum functionalities (e.g. high temperature superconductivity, metal–insulator transitions).…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale inhomogeneity of charge density waves dynamics in La2−xSrxNiO4

Campi

Bianconi

Joseph

et al. 2022

Sci Rep

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While stripe phases with broken rotational symmetry of charge density are known to emerge in doped strongly correlated perovskites, the dynamics and heterogeneity of spatial ordering remain elusive. Here we shed light on the temperature dependent lattice motion and the spatial nanoscale phase separation of charge density wave order in the archetypal striped phase in La2−xSrxNiO4+y (LSNO) perovskite using X-ray photon correlation spectroscopy (XPCS) joint with scanning micro X-ray diffraction (SµXRD). While it is known that the CDW in 1/8 doped cuprates shows a remarkable stability we report the CDW motion dynamics by XPCS in nickelates with an anomalous quantum glass regime at low temperature, T < 65 K, and the expected thermal melting at higher temperature 65 < T < 120 K. The nanoscale CDW puddles with a shorter correlation length are more mobile than CDW puddles with a longer correlation length. The direct imaging of nanoscale spatial inhomogeneity of CDW by scanning micro X-ray diffraction (SµXRD) shows a nanoscale landscape of percolating short range dynamic CDW puddles competing with large quasi-static CDW puddles giving rise to a novel form of nanoscale phase separation of the incommensurate stripes order landscape.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoscale inhomogeneity of charge density waves dynamics in La2−xSrxNiO4

Campi

Bianconi

Joseph

et al. 2022

Sci Rep

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“…Theoretical models capturing the qualitative physics of the CDW phase are well known both starting from a microscopic description, such as in the Peierls model [11,12], and in terms of macroscopic order parameter theories based on the Ginzburg-Landau paradigm [13][14][15][16]. Moreover, recent advances in experimental techniques and material synthesis have enabled the detailed exploration of CDWs in various material classes, leading to tunable properties and potential applications in areas like nanoscale electromechanics and energy storage [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Discommensurations: An Extension to McMillan’s Ginzburg–Landau Theory

Mertens,

van den Brink,

Wezel

2023

Condensed Matter

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Charge density waves (CDWs) profoundly affect the electronic properties of materials and have an intricate interplay with other collective states, like superconductivity and magnetism. The well-known macroscopic Ginzburg–Landau theory stands out as a theoretical method for describing CDW phenomenology without requiring a microscopic description. In particular, it has been instrumental in understanding the emergence of domain structures in several CDW compounds, as well as the influence of critical fluctuations and the evolution towards or across lock-in transitions. In this context, McMillan’s foundational work introduced discommensurations as the objects mediating the transition from commensurate to incommensurate CDWs, through an intermediate nearly commensurate phase characterised by an ordered array of phase slips. Here, we extended the simplified, effectively one-dimensional, setting of the original model to a fully two-dimensional analysis. We found exact and numerical solutions for several types of discommensuration patterns and provide a framework for consistently describing multi-component CDWs embedded in quasi-two-dimensional atomic lattices.

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“…The development of novel synchrotron radiation sources and imaging techniques on the basis of focusing on the X-ray beam down to the nanoscale allow for the visualization of multiscale inhomogeneities of the supramolecular structure [12][13][14][15]. 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].…”

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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Nanoscale Phase Separation of Incommensurate and Quasi-Commensurate Spin Stripes in Low Temperature Spin Glass of La2−xSrxNiO4

Cited by 3 publications

References 91 publications

Nanoscale inhomogeneity of charge density waves dynamics in La2−xSrxNiO4

Nanoscale inhomogeneity of charge density waves dynamics in La2−xSrxNiO4

Two-Dimensional Discommensurations: An Extension to McMillan’s Ginzburg–Landau Theory

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

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