C.Y. Huang

Temperature-dependent hyperfine coupling constants of Mn2+ in flourides

Abstract The temperature dependence of hyperfine coupling constants of Mn 2+ in CaF 2 and BaF 2 were measured. Agreement between theory and experiment is excellent.

Microwave impedance of a thin‐film superconducting ring containing a Notarys proximity effect weak link

The properties of thin tin film superconducting rings containing a proximity effect weak link have been measured at 9.2 GHz. The impedance exhibits steps which at low order are uniformly spaced and are not hysteretic. The magnitude of the field‐modulated component of the power reflected from the cavity resonant at 9.2 GHz is approximately 102 times larger than the signal obtained at 30 MHz and has a signal‐to‐noise ratio of 104 in a 10 cycle bandpass. Higher‐order steps exhibit unexpected features which might be due to the fact that the time between flux entry is comparable to the quasiparticle relaxation time.

On the orbit-lattice interaction of the paramagnetic ions in ethyl sulphates

Abstract The orbit-lattice interaction based on the Van Vleck model is computed to compare with the approximations used by various groups. These approximations turn out to be in poor agreement with our more rigirous calculation. The ratios of the parameters in the orbit-lattice interaction have been found in terms of the static crystal field parameters in the point-charge model.

Temperature dependence of the spectral line shift of MgO:Cr3+

Abstract The temperature dependence of the position of a spectral line MgO:Cr 3+ is interpreted in terms of the Van Vleck orbit-lattice interaction appropriate for all phonon wavevectors.

Paramagnetic resonance and relaxation of the electron cavities in quantum crystals

Abstract The hyperfine interaction and relaxation of the electron cavities have been investigated. An experiment is suggested.

Some evidences of spin-optical phonon relaxation

Abstract The exponential terms in the measured relaxation rates of Sm3+ in LaEs, Er3+ in LaEs and Yb3+ in YbEs have been identified as arising from the spin-optical phonon relaxation process.

Temperature-dependent isotope shifts and phonon-induced zero-field splitting

Abstract The Debye model is used to calculate the mean-square displacement of the magnetic ions in host lattices. The theory is able to account for the observed temperature dependence of the isotope shift in the zero-field splitting.

Phonon-induced spectral linewidths in crystals

Abstract The phonon-induced linewidths of spectral lines in paramagnetic crystals have been calculated. The agreement between theory and experiment is good.

Microwave Properties of Superconducting Intercalated 2H-TaS2

A new class of superconducting compounds has very recently been investigated.1,2 These compounds are atomically thin metallic layers separated by one or more layers of organic molecules.1 The variety of T c ’s obtainable and the strongly anisotropic critical field behavior invite careful study. The normal-to-superconducting transitions of these materials is usually quite broad (~0.5-1°K)2 In some cases this can be directly attributable to inhomogeneities or other phase regions in the sample.3 Microwaves probe a much smaller region in the material than other types of measurements and yield the critical field and temperature information as well as the penetration of the fields into the material.

MICROWAVE PROPERTIES OF SUPERCONDUCTING Pb--In WIRES.

Abstract The microwave properties of superconducting Pb-In wires have been studied as a function of a magnetic field and temperature at 9.2 GHz. Anomalies in the absorption were found both near the critical field and the critical temperature.