Nuclear magnetic resonance studies of the normal state of the heavy fermion system UBe sub 13

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5216042

Lan, K M.D.

{sup 9}Be nuclear magnetic resonance measurements are reported for the normal state of the actinide intermetallic compound UBe{sub 13}. The motivation for this work was to examine the enhancement effect of the heavy fermions in this material in terms of their effect on the dynamic and static parts of the local magnetic field provided by the heavy fermions. The NMR experiments were done over a wide range of temperature and magnetic field. In the normal state of UBe{sub 13}, measurements in the temperature range extending from 0.8 K to room temperature were carried out, while a magnetic field of up to 70 kOe was applied. The measured {sup 9}Be Knight shift in the normal state of UBe{sub 13} is large, strongly temperature-dependent and highly anisotropic. The {sup 9}Be spin-lattice relaxation rate in UBe{sub 13} shows that the noise power of {sup 9}Be local-field fluctuation due to the presence of heavy electrons is three orders of magnitude larger than the value observed in the corresponding non-5f intermetallic compounds ThBe{sub 13}. The magnetic field dependence of {sup 9}Be spin-lattice relaxation rate was also measured in the superconducting state to understand the role of undetermined paramagnetic impurities in the heavy-fermion system.

• Research Organization: California Univ., Los Angeles, CA (USA)
• OSTI ID: 5216042
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALKALINE EARTH ISOTOPES
ALLOYS
BERYLLIUM 9
BERYLLIUM ALLOYS
BERYLLIUM ISOTOPES
EVEN-ODD NUCLEI
FERMIONS
INTERMETALLIC COMPOUNDS
ISOTOPES
KNIGHT SHIFT
LIGHT NUCLEI
MAGNETIC FIELDS
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
URANIUM ALLOYS