TRANSPORT-PROPERTIES AND MAGNETIC PHASES OF NDRU2SI2

• Type: Article in International Scientific Journal
• Date: 1992

Authors

sousa, j. b. (Author) FCUP; AMADO, MA (Author) Other; PINTO, RP (Author) Other; M. A. Salgueiro da Silva (Author) FCUP; BRAGA, ME (Author) Other; CHEVALIER, B (Author) Other; ETOURNEAU, J (Author) Other

Journal

Title: Journal of Magnetism and Magnetic Materials

Vol. 111

Pages: 239-248

ISSN: 0304-8853

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 12 Citations

Other information

Authenticus ID: P-001-PHS

DOI: 10.1016/0304-8853(92)91082-5

Abstract (EN): The tetragonal NdRU2Si2 compound exhibits a sequence of different magnetic phases below T(N) = 23.5 K: (i) first, a purely sine-wave modulation with q=(2-pi/a)(0.13, 0.13, 0), (ii) below T*=15 K this structure gradually squares-up (3 q-harmonics) and (iii) below T(c) almost-equal-to 9 K the ferro-magnetic phase sets in. Accurate measurements of the electrical resistivity (rho, d(rho)/dT), thermoelectric power (S, dS/dT) and high resolution differential thermal analysis (DTA) are reported. Sharp singularities occur in d-rho/dT and dS/dT at T(c) and T(N). The onset of the square-modulated phase (T < 15 K) produces a pronounced decrease in rho(T). The DTA data show that the T(N)-anomaly is of 2nd order. Also, for the order-order transition at T(c) (modulated-ferro) the DTA data give no evidence for a latent heat. A theoretical account is given on the dominant effects observed in each magnetic phase. The anomalous behaviour of rho and S at high temperature are here associated to crystal field effects.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10