Technology, Preparation, and Characterization

Werfel, F.; Erb, A.; Fuchs, G.; Krabbes, G.; Canders, W.‐R.; Wördenweber, R.; Meyer, H.‐G.; Fritzsch, L.; Anders, S.; Schmelz, M.; Kunert, J.; Oelsner, G.; Tanabe, K.; Shen, Tengming; Jiang, J.; Hellstrom, E. E.; Paranthaman, Mariappan Parans; Aytuğ, Tolga; Stan, Liliana; Jia, Quanxi; Cantoni, Claudia; Bottura, L.; Luongo, C.A.; Kaiser, G.; Schroeder, Gunar; Kade, Andreas

doi:10.1002/9783527670635.ch3

Cited by 1 publication

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“…The optimally doped Nd 2-x Ce x CuO 4+δ crystals (x ≈0.15) exhibit an oxygen surplus directly after growth which has to be removed by an additional post-growth annealing treatment. Such annealed crystals exhibit a transition temperature T c of 23.5 K with transition widths of 1 K [52,53]. The very high crystal quality of Nd 2-x Ce x CuO 4+δ is manifest particularly well in magnetic quantum oscillations observed on several samples at different doping levels [50].…”

Section: Samplementioning

confidence: 87%

Emergence of pseudogap from short-range spin-correlations in electron-doped cuprates

et al. 2020

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Electron interactions are pivotal for defining the electronic structure of quantum materials. In particular, the strong electron Coulomb repulsion is considered the keystone for describing the emergence of exotic and/or ordered phases of quantum matter as disparate as high-temperature superconductivity and charge-or magnetic-order. However, a comprehensive understanding of fundamental electronic properties of quantum materials is often complicated by the appearance of an enigmatic partial suppression of low-energy electronic states, known as the pseudogap. Here we take advantage of ultrafast angleresolved photoemission spectroscopy to unveil the temperature evolution of the low-energy density of states in the electron-doped cuprate Nd 2-x Ce x CuO 4 , an emblematic system where the pseudogap intertwines with magnetic degrees of freedom. By photoexciting the electronic system across the pseudogap onset temperature T*, we report the direct relation between the momentum-resolved pseudogap spectral features and the spin-correlation length with an unprecedented sensitivity. This transient approach, corroborated by mean field model calculations, allows us to establish the pseudogap in electron-doped cuprates as a precursor to the incipient antiferromagnetic order even when long-range antiferromagnetic correlations are not established, as in the case of optimal doping.

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Section: Samplementioning

confidence: 87%