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UPt3
UPt3 is an inorganic binary intermetallic crystalline compound of platinum and uranium. Production It can be syntetized in the following ways: * as an intermetallic compound, by direct fusion of pure components according to stoichiometric calculations: :: \mathsf * by reduction of uranium dioxide with hydrogen in the presence of platinum: :: \mathsf Physical properties UPt3 forms crystals of hexagonal symmetry (some studies hypothesize a trigonal structure instead), space group P63/mmc, cell parameters ''a'' = 0.5766 nm and ''c'' = 0.4898 nm (''c'' should be understood as distance from planes), with a structure similar to nisnite (Ni3Sn) and MgCd3. The compound congruently melts at 1700 °C. The enthalpy of formation of the compound is -111 kJ/mol. At temperatures below 1 K it becomes superconducting Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic flux fields are expelled from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heavy Fermion Superconductor
Heavy fermion superconductors are a type of unconventional superconductor. The first heavy fermion superconductor, CeCu2Si2, was discovered by Frank Steglich in 1978. Since then over 30 heavy fermion superconductors were found (in materials based on Ce, U), with a critical temperature up to 2.3 K (in CeCoIn5). Heavy Fermion materials are intermetallic compounds, containing rare earth or actinide elements. The f-electrons of these atoms hybridize with the normal conduction electrons leading to quasiparticles with an enhanced effective mass. From specific heat measurements (ΔC/C(TC) one knows that the Cooper pair In condensed matter physics, a Cooper pair or BCS pair (Bardeen–Cooper–Schrieffer pair) is a pair of electrons (or other fermions) bound together at low temperatures in a certain manner first described in 1956 by American physicist Leon Coope ...s in the superconducting state are also formed by the heavy quasiparticles. In contrast to normal superconductors it can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |