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Abstract. High-pressure neutron-diffraction experiments on the pseudo-ternary compound NdAlxGa2-x revealed a pressure-induced isostructural phase transition for x=1.00 and 1.08 above about 1.5GPa at room temperature. Within its hexagonal AlB2 structure the compound changes its lattice ratio c/a discontinuously from 0.97 to 0.84 in analogy to chemical pressure for x1.12. Pressures up to 5.2GPa did...
Abstract. Inelastic neutron scattering studies of the relaxation rate of crystal-field excitations have provided evidence for large oxygen and copper isotope effects on the pseudogap in high-temperature superconductors. Existing experiments in the slightly underdoped HoBa2Cu4O8 compound will be reviewed, as well as possible implications of such findings on the microscopic mechanism of high-temperature...
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