Local electronic properties of dilute magnetic alloys

Technical Report · Fri Dec 01 04:00:00 EST 1978

OSTI ID:6054262

Yoksan, S

Some local properties of dilute magnetic alloys are studied in the normal and the superconducting states. The effects of elastic and inelastic scattering are considered. It is found that near the transition temperature, the spatial variation of the superconducting order parameter around a single magnetic impurity at large distances has a chracteristic 1/r dependence with an amplitude proportional to the depression of T/sub c/, whereas at short distances, the spatial dependence is of the form (a + bcos2k/sub f/r)/r/sup 2/ + c/r. A microscopic calculation is presented for the host nuclear spin-lattice relaxation time in the presence of 3d-transition metal impurities in a host at T << T/sub k/, as a function of impurity-host distance r. Two important mechanisms are considered; the relaxation due to the localized spin fluctuations, and the kinematic change because of the resonant scattering of conduction electrons. It is found that, for systems with low T/sub k/ such as Cu Fe, the spin fluctuation contribution is dominant and the Korringa relation is valid, but for systems with high T/sub k/, both mechanisms are of equal importance, the net host relaxation rate and the excess Knight shift do not satisfy the Korringa relation.

• Research Organization: California Univ., Riverside (USA)
• OSTI ID: 6054262
• Report Number(s): SAN-0034-T4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
ALLOYS
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EQUATIONS
IMPURITIES
IRON ALLOYS
KNIGHT SHIFT
KONDO EFFECT
MAGNETIC MATERIALS
MATHEMATICAL MODELS
METALS
PHYSICAL PROPERTIES
RELAXATION
SPIN-LATTICE RELAXATION
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE