Kondo anomalies of heat conductivity and Lorenz ratio in normal state (La,Ce)Al$sub 2$

Journal Article · Sun Jun 01 04:00:00 EDT 1975 · Z. Phys., B, v. 21, no. 2, pp. 165-170

OSTI ID:4123863

Moeser, J H; Steglich, F

The thermal conductivity of LaAl$sub 2$ and of two dilute (La, Ce)Al$sub 2$ alloys was measured in the normal state between 0.4 and 8 K. From the lattice conductivity of LaAl$sub 2$ a high dislocation density Nsub(d) caused by the arc melting process can be inferred. After annealing Nsub(d) is reduced by an order of magnitude. For the (La, Ce)Al$sub 2$ samples minima are observed at 5 K in the Wsup(e) x T vs. T curves (Wsup(e) = electronic thermal resistivity). Below 1 K the quantity Wsup(e) x T is linear in (-ln T). The electronic Lorenz ratio Lsup(e)(T) = p(T)/Wsup(e)(T) x T shows a maximum at 2 K with a value 23% above Lsup(e)(0). It is for the first time that this Kondo anomaly is established in its full temperature dependence. (orig.)

• Research Organization: Koeln Univ. (F.R. Germany). 2. Physikalisches Inst.
• NSA Number: NSA-33-009839
• OSTI ID: 4123863
• Journal Information: Z. Phys., B, v. 21, no. 2, pp. 165-170, Journal Name: Z. Phys., B, v. 21, no. 2, pp. 165-170; ISSN ZPBBD
• Country of Publication: Germany
• Language: English

Related Subjects

*ALUMINIUM ALLOYS-- THERMAL CONDUCTIVITY
*CERIUM ALLOYS-- THERMAL CONDUCTIVITY
*LANTHANUM BASE ALLOYS-- THERMAL CONDUCTIVITY
360104* --Materials--Metals & Alloys--Physical Properties
ANNEALING
DISLOCATIONS
INTERMETALLIC COMPOUNDS
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
ULTRALOW TEMPERATURE