A General and Convenient Procedure for the Synthesis of N-Alkylarylamines and N-Alkylheteroarylamines by Electrophilic Amination of Cuprates with N-Alkylhydroxylamines. The phase diagram of underdoped cuprates in a magnetic field ( H ) is key to understanding the anomalous normal state of these high-temperature superconductors. In fact, in electron-doped cuprates, long-range order persists to high doping levels, and the divergence in magnetic correlation length is only cut-off when superconductivity emerges 42. For high–transition temperature cuprate superconductors, stripes are widely suspected to exist in a fluctuating form. From a host of recent experiments there is now compelling evidence of translational-symmetry-breaking charge density wave (CDW) order in a wide range of doping inside this phase. The recent discovery of charge order in various cuprate families fueled new interest into the role played by this incipient broken symmetry within the complex phase diagram of high-Tc superconductors. Science , this issue p. [1161][1], p. [1155][2] Upon doping, Mott insulators often exhibit symmetry breaking where charge carriers and their spins organize into patterns known as stripes. Charge order in cuprates. We used mid-infrared femtosecond pulses to transform one such stripe-ordered compound, nonsuperconducting La1.675Eu0.2Sr0.125CuO4, into a transient three-dimensional superconductor. Similarly, in LSCO the dominant instability appears to be magnetic, with the charge order playing a secondary role. Many theorists claim to have solved high temperature superconductivity, but none of these proposals are universally supported by experiments and/or universally accepted by the research community.

Understanding the pseudogap phase in hole-doped high-temperature cuprate superconductors remains a central challenge in condensed-matter physics. The Journal of Organic Chemistry 1999, 64 (2) , 641-643. The undoped cuprates are antiferromagnetic insulators where the S=1/2 Cu spins order at high temperatures, typically near or above room temperature. One of the phenomena observed in high-Tc cuprates is the so-called charge order. However, the upper critical field ( H c2), the extent of superconducting (SC) phase with vortices, and the role of charge orders at high H remain controversial. DOI: 10.1021/jo981412h. The in-plane Cu exchange interactions are much stronger than along the c-axis, and thus again the magnetism is two-dimensional in nature. One of the most intriguing features of some high-temperature cuprate superconductors is the interplay between one-dimensional “striped” spin order and charge order, and superconductivity.


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