TRANSPORT-PROPERTIES AND MAGNETIC PHASES OF NDRU2SI2

• Tipo: Artigo em Revista Científica Internacional
• Data: 1992

Autores

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

Revista

Título: Journal of Magnetism and Magnetic Materials

Vol. 111

Páginas: 239-248

ISSN: 0304-8853

Editora: Elsevier

Indexação

ISI Web of Knowledge - 11 Citações

Scopus - 12 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10