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Low-temperature magnetoresistance of UPd2Al3 thin films

✍ Scribed by J. Hessert; M. Huth; M. Jourdan; H. Adrian

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
222 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

The transverse magnetoresistance Ap/p(B,T)=(p(B,T)-p(0,T))/p(0,T) of epitaxial UPd2A13 thin films with various defect densities has been measured in the temperature range from 2K to 35K and in magnetic fields up to 12T. Whereas in films with low defect densities Ap/9 for BIl_c shows a strong positive magnetoresistance (up to 15% at (12T,2K)) due to the formation of a coherent band of heavy quasiparticles, we find a negative magnetoresistance in films with high defect concentration which is expected for a Kondo system in the incoherent regime. For B.l_c a local maximum in the (B,T)-plane of Ap/p can be resolved near (4T,6K).

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We report on high-field (B < 38 T) magnetoresistance experiments on a single-crystalline sample of the heavy-fermion antiferromagnet UPd2A13 (T N = 14 K) at liquid-helium temperatures. The antiferromagnetic phase boundary, previously detected by magnetization measurements at B c = 18 T for a field i