Electronic phase separation: Recent progress in the old problem

Kagan, M. Yu.; Кugel, K. I.; Rakhmanov, A. L.

doi:10.1016/j.physrep.2021.02.004

Cited by 25 publications

(15 citation statements)

References 397 publications

(828 reference statements)

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“…The formation of a glassy electronic phase at a low temperature was observed in other nickelates and related materials [63][64][65][66][67][68]. Moreover, it was found that the spin stripe phase in La 1−x Sr x NiO 4 below 120 K presented a strong spatially inhomogeneous landscape, with the formations of the spin stripe rich regions and spin stripes poor regions [43] providing evidence of nanoscale electronic phase separation [69,70] observed in several strongly correlate systems [71][72][73].…”

Section: Introductionmentioning

confidence: 72%

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

2021

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While spin striped phases in La2−xSrxNiO4+y for 0.25 < x < 0.33 are the archetypal case of a 1D spin density wave (SDW) phase in doped antiferromagnetic strongly correlated perovskites, few information is available on the SDW spatial organization. In this context, we have measured the spatial variation of the wave vector of the SDW reflection profile by scanning micro X-ray diffractions with a coherent beam. We obtained evidence of a SDW order–disorder transition by lowering a high temperature phase (T > 50 K) to a low temperature phase (T < 50 K). We have identified quasi-commensurate spin stripe puddles in the ordered phase at 50 < T < 70 K, while the low temperature spin glassy phase presents a nanoscale phase separation of T = 30 K, with the coexistence of quasi-commensurate and incommensurate spin stripe puddles assigned to the interplay of quantum frustration and strong electronic correlations.

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Section: Introductionmentioning

confidence: 72%

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

2021

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“…Such orders can be inferred to exist in various materials such as transition metal dichalcogenides [21][22][23][24][25] and cuprate supercondoctors [26][27][28][29][30][31][32][33][34][35][36][37]. Numerous experiments and theoretical studies have also indicated the importance of competing multiple orders with inhomogeneity [38][39][40][41][42][43][44][45]. In addition, it is considered that inhomogeneity acts as a trigger in the initial process of the photoinduced phase transition [42,46,47].…”

Section: Introductionmentioning

confidence: 99%

Photoinduced pseudospin-wave emission from charge-density-wave domain wall with superconductivity

Yukihiro¹,

Yumoto²,

Matsueda³

2023

Preprint

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We study photoinduced dynamics triggered by an inhomogeneity due to competition between charge density waves (CDWs) and superconductivity. As a simple example, we consider the superconducting (SC) interface between two CDW domains with opposite signs. The real-time dynamics are calculated within the timedependent Hartree-Fock-Bogoliubov framework, where the order parameter dynamics and the nonequilibrium quasiparticle distribution functions are studied. We also calculate the various dynamical response functions within a generalized random phase approximation. Through comparisons between the real time dynamics and the analysis of the response functions, it is found that the photo-driven SC interface can emit collective modes of the SC order parameter. This is analogous to the spin wave emission from the magnetic domain wall in an antiferromagnet, particularly in the case of a low driving frequency, where the order parameters can be mapped onto the pseudospin picture. In the high-frequency case, we find a domain wall melting caused by changes in the quasiparticle distribution, which induces superconductivity in the whole system.

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“…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%

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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Electronic phase separation: Recent progress in the old problem

Cited by 25 publications

References 397 publications

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

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

Photoinduced pseudospin-wave emission from charge-density-wave domain wall with superconductivity

Nanoscale inhomogeneity of charge density waves dynamics in La2−xSrxNiO4

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