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Magnetic-susceptibility measurements have been used to locate the first excited state in the energy-level diagram for CaF 2 : Ce 3 + . All other levels in the tetragonally split system have been observed spectroscopically and from these experiments the first excited state was predicted to be at...
Ordering and relaxation in spin glasses are discussed in terms of the diffusion of the point representing the system in eigenstate space. On this approach, the spin-glass transition T g appears as a percolation threshold; stretched exponential relaxation behavior extends from T g to an upper...
Unlike the orthorhombic phase, the icosahedral phase of Al 86 Mn 14 exhibits a local magnetic moment. The effective moment of icosahedral-phase Al-Mn and Al-Si-Mn alloys increases with Mn concentration up to a maximum of (1.5±0.5 μ B ). The amorphous and icosahedral phases of Al-Si-Mn have...
Paramagnetic neutron scattering from the insulating Heisenberg ferromagnet EuO has been studied through the entire Brillouin zone. The measured linewidth Γ of the quasielastic scattering at T c follows the predictions of dynamic scaling Γ= Aq 2.5 up to momentum transfers q=0.4 A ̊ - 1 . The...
It is shown that the unidirectional remanence and anisotropy generated in Cu 75 Mn 25 by an isothermally applied large field can be reversed isothermally at the same temperature by applying a field of the same magnitude in the reversed direction.
The site percolation problem on a cubic lattice in which entire lines of sites are removed randomly is analyzed with use of both analytical and large-cell (up to 100 3 ) Monte Carlo renormalization-group techniques. Because of strong correlation effects, the behavior of small systems deviates...
We present a systematic experimental study of the high-temperature susceptibility of diluted magnetic (semimagnetic) semiconductors Cd 1 - x Mn x Se, Cd 1 - x Mn x Te, and Hg 1 - x Mn x Se, and we analyze these together with the previously published results for Hg 1 - x Mn x Te and Zn 1 - x Mn x...
In N -component spin systems of crystals with cubic anisotropy in the presence of extended defects, namely ε d -dimensionally connected defects distributed randomly in d- ε d dimensions, the first-order phase transition occurs for 2 ≤N<4 in order ε (≡4-d) near the stability boundary of the...
Mg 2 SiO 4 single crystals implanted at room temperature with 100-keV Fe + 57 ions in the dose range from 1.0× 10 16 up to 1.3× 10 17 ions cm - 2 have been studied directly after implantation and after subsequent annealings in air at temperatures up to 1200 ° C by using three complementary...
dc conductivity measurements of barely insulating uncompensated Si:As samples yield results showing Mott variable-range-hopping behavior lnσ∝( T 0 /T)(1/4) in the temperature range 0.15
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