Positive and 'colossal' magnetocaloric effect due to charge ordering in CMR manganites

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Reis, Mário Souza (Author) Other; Gomes, Angelo M S (Author) Other; Araújo, João Pedro (Author) FCUP; Tavares, Pedro B. (Author) Other; Oliveira, Ivan S. (Author) Other; Amaral, V. S. (Author) Other

Journal

Title: Journal of Magnetism and Magnetic Materials

Vol. 272

Pages: 2393-2394

ISSN: 0304-8853

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-000-AM2

DOI: 10.1016/j.jmmm.2003.12.650

Abstract (EN): The magnetocaloric effect (DeltaS(M)) is studied across the ferromagnetic to charge ordered composition range in Pr1-xCaxMnO3 manganites (0.25 less than or equal to x less than or equal to 0.40). The ferromagnetic phase transition leads to usual entropy decrease on the application of a magnetic field. The charge order transition (T-CO similar to 220-250 K) leads to an uncommon entropy increase, of comparable magnitude (4 J kg(-1) K-1 for 40 kOe). At lower temperatures (T < 50K), close to the field-induced mixed phase, extremely large values of DeltaS(M) are found (for x = 0.32, -20.8 J kg(-1) K-1 for 40 kOe at 26 K).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 2