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ESR spectra of nearest-neighbor Cr 3 + pairs in Zn Ga 2 O 4 are studied in detail at two frequency bands: X band (9.9 GHz) and Q band (32.5 GHz). Transitions within each of the spin multiplets Σ = 1 , 2 , and 3 are observed. From the angular dependence of the spectra it is found that local...
Isothermal-magnetization data have been obtained for a series of well-annealed chromeplated Pb-In alloys of In composition between 30 and 80 at.% in the temperature range 1.90 °K to the appropriate transition temperature. The empirical relation proposed by Toxen involving the...
The positron annihilation rate is calculated in the Wigner crystal and shown to approach the positronium value continuously from above as r s becomes large. For r s ≈ 15 , the numerical value is roughly in agreement with what is expected from the knowledge of the rate in low-density metals.
Phase transitions with tricritical points occur in catastrophes generated by sixth-order polynomials. The catastrophe theory of the phase transition is more general than the corresponding Landau theory (at the expense of some of its predictive power) and does not suffer from some of the defects...
The change in ultrasonic attenuation and velocity of metals due to spins coupled via the Alpher-Rubin mechanism is calculated. In particular the results are applied to nuclear- and electronic-spin resonance in paramagnetic metals where discrepancies with previous calculations are found.
Using the functional-integral method applied to the BCS Hamiltonian we have calculated the partition function, off-diagonal correlation function, specific heat, and conductivity of a super-conductor in the transition region. The partition function is obtained in the form ∫ D ψ e - β F ψ ,...
The effect of hydrostatic pressures, up to 6 kbar, on the anomalies occurring in the ultrasonic wave propagation in gadolinium single crystals below the Curie point, is investigated. The elastic softening of the c 33 elastic constants, and its pressure dependence, is discussed in terms of the...
Recent NMR and specific-heat measurements have revealed the presence of magnetic phase transitions in CsNi Cl 3 at 4.85 and 4.4°K. Previous neutron-diffraction studies have revealed only one transition and we have, therefore reexamined a single crystal of CsNi Cl 3 in the temperature range...
Measurements of Co 59 NMR shifts and spin-relaxation rates in Au Co confirm the nonmagnetic character of isolated cobalt impurities in gold. In the temperature range 1.2-4.0 °K, a large positive resonance shift K = + ( 29.2 ± 0 . 2 ) % is observed, indicative of a dominant orbital hyperfine...
The anomalies of ultrasonic attenuation at structural transitions are studied theoretically by the mode-coupling theory. In situations like the 110 °K transition of SrTi O 3 , where a central resonance couples to the order-parameter fluctuations, two regimes with different critical anomalies,...
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