Crossover to quantum tunneling and relaxation in dipolar glasses

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

dos Santos, JMBL (Autor) FCUP; Santos, ML (Autor) FCUP; Chaves, MR (Autor) FCUP; Almeida, A (Autor) FCUP; Klopperpieper, A (Autor) Outra

Revista

Título: Physical Review B - Condensed Matter and Materials Physics

Vol. 61

Páginas: 3155-3158

ISSN: 1098-0121

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 5 Citações

Scopus - 5 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-001-0Z6

Abstract (EN): Arrhenius plots of mean relaxation rates in dipolar glasses often show deviations from linear behavior at low temperatures. The upward curvature in these plots is usually attributed to quantum tunneling solely on the basis that a quantum tunneling rate should have a finite, nonzero value, at T = 0, without further quantitative analysis of experimental data. We find that experimental data of relaxation in several dipolar glasses fits quite well to detailed theoretical predictions for the crossover region between classical activation and quantum tunneling. The values of the parameters of the metastable potential barriers obtained from the fits raise some interesting questions about these often quoted deviations from Arrhenius behavior.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4