Low temperature specific heat and thermoelectric power of UCu3M2Al7 alloys

Wojciech Suski 1,2Krzysztof Gofryk 1Alicja Hackemer 1Konrad WOCHOWSKI 1

1. Polish Academy of Sciences, Institute of Low Temperature and Structure Research (INTiBS), Okólna 2, Wrocław 50-422, Poland
2. International Laboratory of High Magnetic Fields and Low Temperatures (ML), Gajowicka 95, Wrocław 53-421, Poland

Abstract

Our previous investigations of the magnetic and electrical properties of the UCu3M2Al7 alloys where M = Cr, Mn and Fe are being extended now to the examination of the specific heat and thermoelectric power. The specific heat has been measured in the temperature range 1.2 - 70 K in magnetic field H = 0 and 3T using a homemade and fully automatic calorimeter, whereas the thermoelectric power has been measured from 6 to 300 K emploing a differential method with copper as reference material. The specific heat vs. temperature plot exhibits only minute influence of magnetic field and no anomaly in the investigated temperature region. However, the coefficient of the electronic specific heat is enhanced amounting to about 200 mJ/molK2 at high temperature and to about 400 mJ/molK2 at low temperature. Strongly correlated electrons or crystallographic disorder are considered as a reason for these values. The thermoelectric power demonstrates moderate values in whole investigated temperature range.

 

Presentation: poster at E-MRS Fall Meeting 2005, Symposium B, by Wojciech Suski
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-17 10:54
Revised:   2009-06-07 00:44