819 research outputs found
Universal optimal hole-doping concentration in single-layer high-temperature cuprate superconductors
We argue that in cuprate physics there are two types, hole content per
CuO plane () and the corresponding hole content per unit volume
(), of hole-doping concentrations for addressing physical properties
that are two-dimensional (2D) and three-dimensional (3D) in nature,
respectively. We find that superconducting transition temperature ()
varies systematically with as a superconducting \textquotedblleft
\textquotedblright with a universal optimal hole-doping concentration
= 1.6 10 cm for single-layer high
temperature superconductors. We suggest that determines the
upper bound of the electronic energy of underdoped single-layer high-
cuprates.Comment: 8 pages, 4 figures; added references ;accepted for the publication in
Supercond. Sci. Technol ; Ref. 13 is revise
Far-infrared measurements of oxygen-doped polycrystalline La2CuO4.0315 superconductor under slow-cooled and fast-cooled conditions
We have studied the far-infrared (far-IR) charge dynamics of an equilibrated
pure oxygen doped La2CuO4+0.0315 under slow-cooled and fast-cooled conditions.
The superconducting transition temperature (Tc) for the slow-cooled and that
for the fast-cooled processes were respectively found to be close to the two
intrinsic Tc's: One at 30 K and the other at 15 K. Direct comparison with our
previous results and other far-IR and Raman studies on single crystalline
La2-xSrxCuO4, we conclude that the topology of the pristine electronic phases
that are responsible for the two intrinsic Tc's is holes arranged into
two-dimensional (2D) square lattices.Comment: Submitted to PR
Observation of the predicted charge collective mode of the Tc = 45 K superconducting phase of La2CuO4+{\delta}
We report the far-infrared (far-IR) observation of the Goldstone mode at ~ 72
cm-1 (~ 9 meV) predicted to exist in the superconducting phase of the
transition temperature (Tc) at 45 K in the La2CuO4-based superconductors. Our
observation furthers the experimental support for the two-component picture
where the localized charge texture, formed at a specific planar hole density
(Ppl), is tied to the HTS at Tc = 15 K, 30 K, and 45 K in a hierarchical
fashion at the so-called "magic" doping level at Ppl = 1/16, 2/16, and 3/16
respectively.Comment: 3 figure
Experimental Observation of Environment-induced Sudden Death of Entanglement
We demonstrate the difference between local, single-particle dynamics and
global dynamics of entangled quantum systems coupled to independent
environments. Using an all-optical experimental setup, we show that, while the
environment-induced decay of each system is asymptotic, quantum entanglement
may suddenly disappear. This "sudden death" constitutes yet another distinct
and counter-intuitive trait of entanglement.Comment: 4 pages, 4 figure
- …