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Optical investigation of the antiferromagnetic phase transitions in heavy-electron compounds

✍ Scribed by L. Degiorgi; H.R. Ott; M. Dressel; G. Grüner; C. Geibel; F. Steglich; Z. Fisk

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
205 KB
Volume
206-207
Category
Article
ISSN
0921-4526

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✦ Synopsis

We have investigated the electrodynamic response of the heavy-electron compounds UPd2AI 3 (T N = 14.5 K) and UCu 5 (T N = 15 K). The complete excitation spectra were obtained by Kramers-Kronig transformation of the optical reflectivities measured on a fairly broad frequency range (i.e. from 15 up to 105 cm 1), combined with the direct measurement of the conductivity at millimeter and microwave frequencies. In UCu 5 we found an absorption in the far infrared below Try, which is ascribed to excitations across a spin-density-wave-type gap and indicates the itinerant nature of the magnetic phase transition. This feature is absent in UPd2AI3, in accordance with the local magnetic moment character of the antiferromagnetic order.

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