Experimental studies for the spin and charge excitations in doped cuprates. Insight into the energy - wavevector relation of the excitations is important since spin fluctuations are connected to the superconductivity in cuprates. These high-resolution resonant inelastic X-ray studies are an alternative to neutron scattering to investigate spin dynamics.
Experimentalists have pinpointed the microscopic structure of waves inside high-temperature superconductors, which could be the key to understanding the complex materials.
Mikko Hakala's insight:
An interesting, broad and detailed article about the current advancements in understanding the microscopic origin of superconductivity in cuprates.
The article discusses recent findings by various groups. In particlar, it addresses the details of the d-wave charge density order, and how antiferromagnetism is the parent state both to superconductivity and to charge density waves.
Challenges remain, for example "[a recently proposed theoretical framework] is not yet refined enough to predict how the balance of charge density waves and superconductivity vary with temperature, magnetic field or type of cuprate."
In short, this is a clarifying expert article on a specific condensed matter topic, the origin of d-wave superconductivity and the nature of charge density waves in cuprates.
Scientists seeking to understand the intricacies of high-temperature superconductivity—the ability of certain materials to carry electrical current with no energy loss—have been particularly puzzled by a mysterious phase that emerges as charge carriers are added that appears to compete with superconductivity. ...
At low hole doping, i.e. at the pseudogap phase, the static electron arrangement (charge density wave or "frozen" stripe patterns) and the associated nanoscale fluctuations prevent the free flow of electrons. At higher hole doping the density wave disappears and unrestricted superconductivity appears.
Measurements by spectroscopic imaging scanning tunneling microscope.
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