Spin-flip scattering in heavy-fermion alloys

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5525979

Sheng, Q G

The s-d model of two magnetic impurities coupled via a RKKY interaction is studied. The purpose is to investigate the relative importance of the RKKY interaction in the heavy-fermion systems. In addition to the known Kondo {chi}lnT dependence of the electron lifetime from single-impurity scattering, a {chi}{sup 2}/T dependence of the electron lifetime due to impurity-pair scattering (where {chi} is the impurity concentration) was found. This leads to a resistance maximum at a characteristic temperature, which is linearly dependent on {chi}. This theoretical prediction agrees with experimental results in several heavy-fermion alloys, such as (Ce{sub ex}La{sub 1-x})Cu{sub 2}Si{sub 2}. The study is extended to include an external magnetic field. The field is predicted to suppress both the Kondo lnT effect and the RKKY 1/T effect, in agreement with experimental magnetoresistance data for UBe{sub 13}.

• Research Organization: Virginia Univ., Charlottesville, VA (USA)
• OSTI ID: 5525979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CERIUM ALLOYS
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FERMIONS
IMPURITIES
INELASTIC SCATTERING
KONDO EFFECT
LANTHANUM ALLOYS
MAGNETIC FIELDS
MAGNETORESISTANCE
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SCATTERING
SILICON ALLOYS
SPIN FLIP
TEMPERATURE DEPENDENCE