Materials exhibiting the highest known superconducting critical temperatures over the last century. Reference 68, Vol. 30, p. 3.
(a) ac magnetic susceptibility data showing transitions into the superconducting state in the system. (b) Reduced superconducting critical temperature vs impurity concentration ( in this plot). Values of identified by letters correspond to the data in (a). At certain concentrations, reentrant superconductivity is observed. The dashed line is predicted by the theory of Abrikosov and Gor’kov. Reference 20, p. 831.
Magnetic field - temperature phase diagram for the compound showing superconducting (S) and normal (N) regions. The inset shows normalized electrical resistance in field. After Ref. 18, p. 498, 499.
Schematic diagram of the S-N-S-N transition sequence in an applied magnetic field . is the net magnetic field acting on the conduction electron spins, is the exchange field produced by the localized magnetic moments, and is the paramagnetic limiting field. The material is superconducting (S) when and normal (N) otherwise. Reference 14, p. 95.
Crystal structure of the compounds. The dashed lines outline the primitive tetragonal unit cell; for clarity, the cubes representing the units are not drawn to scale. It is believed that the superconducting electrons reside primarily within the clusters and their spins interact only weakly with the magnetic moments of the R ions. Reference 23, p. 661.
The phase diagram of the system, showing the temperatures and concentrations at which superconductivity and ferromagnetism are found. In a limited range of and , superconducting and magnetically ordered regions microscopically coexist. Reference 27, p. 482.
Suppression of the antiferromagnetic transition temperature and onset of superconductivity in with applied pressure. The superconducting phase boundary has a dome shape, magnified in the upper right inset. The lower left inset shows the unusual dependence of the low electrical resistivity at . After Ref. 43, p.267 and Reference 44, p. 41.
The temperature-pressure phase diagram of . At ambient pressure, is a ferromagnet, but under applied pressure it becomes superconducting with a maximum transition temperature of about around . The labels FM1 and FM2 denote two different ferromagnetic phases. Superconductivity and magnetic order in disappear at the same pressure. Reference 49, p. S1946.
The magnetic field and temperature dependence of the superconducting and high-field ordered phases (HFOP) of . Inelastic neutron scattering identified antiferroquadrupolar order in the HFOP, supporting conjectures that the unconventional superconducting state may be related to quadrupolar fluctuations. After Ref. 5, Vol. II, p. 634.
Schematic generic temperature -dopant concentration phase diagram for high cuprate superconductors, showing the symmetry between electron- and hole-doped cuprates. The electron-doped side is based on the phase diagram of , while the hole-doped side is based on the phase diagram. On the hole-doped side, the AFM and superconducting (SC) regions are bounded by the pseudogap phase, which is separated from the normal state by a line of crossover temperatures . While there is evidence for the existence of a pseudogap phase on the electron-doped side, it has not yet been definitively established.
Crystal structures of (T-phase) and ( , Nd, Sm, Eu, Gd; -phase) parent compounds. Reference 63, p. 63.
Schematic temperature-pressure phase diagram of the organic salts, based on TMTSF and TMTTF, the sulfur analog of TMTSF. The arrows indicate the ambient pressure phases of particular molecular crystals; both applied pressure and chemical composition affect the ground states of these materials. The various phases in this diagram are LOC: charge-localized insulator, SP: spin-Peierls, SDW: spin density wave, AF: antiferromagnetic insulator, and SC: superconductor. Reference 5, Vol. II, p. 641.
Two unconventional superconducting pairing states suggested to exist in have different Cooper pair spin orientations (thin arrows) and orbital angular momentum (thick arrows). The state on the left has an angular momentum perpendicular to the in-plane spin, giving it nonzero total angular momentum. The state on the right has zero total angular momentum because the orbital angular momentum is balanced by the spins of the Cooper pair. Experiments indicate that the superconducting phase in has nonzero angular momentum like the schematic on the left. Reference 78, p. 44.
Superconducting phase diagram of sodium cobaltate hydrate. The inset illustrates the layered crystal structure. Reference 84, p. 529.
Superconducting transition temperatures of the carbon fullerenes. The dashed line is a relationship between and lattice constant predicted by BCS theory. Reference 82, p. 641.
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