Thermoelectric Power of Gd-4(Co-A)(3) Compounds (A = Cu, Pt)

• Type: Article in International Conference Proceedings Book
• Date: 2013

Authors

Teresa Seixas (Author) FCUP; M. A. Salgueiro da Silva (Author) FCUP; Braun, HF (Author) Other; Eska, G (Author) Other

Conference proceedings International

Title: ADVANCED MATERIALS FORUM VI, PTS 1 AND 2

Pages: 159-163

6th International Materials Symposium (MATERIALS 2011)/15th Meeting of SPM

Guimaraes, PORTUGAL, APR 18-20, 2011

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-005-3MT

DOI: 10.4028/www.scientific.net/msf.730-732.159

Abstract (EN): We report on a comparative study of thermoelectric power measurements (S(7)) in ferrimagnetic Gd-4(Co(1-x)A(x))(3) compounds with A = Cu, Pt, in the temperature range 8 K - 300 K. Whereas in Gd4Co3 S(T) is always negative, for x > 0 the substitution of Co for Cu/Pt gives rise to the appearance of a low temperature positive maximum in S(2) at around 30 K. Based on our previous study of Gd-4(Co1-xCux)(3) compounds, we argue that this maximum in S(7) originates from electron-magnon scattering and is sensitive to electron band structure changes resulting from the substitution of Co for Cu/Pt and the accompanying reduction in the ratio between the electron-magnon and the electron-phonon scattering strengths. The decreasing role of Co 3d electrons with the progressive substitution of Co for Cu/Pt, evidenced by a strong reduction in the spin disorder resistivity and the Co magnetic moment, is seen to be crucial for the existence of such low temperature maximum in S(T) for x > 0. It is seen that the substitution of Co for Pt leads to higher values of the amplitude and temperature of the positive maximum in S(T) than the substitution of Co for Cu.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5