| Texto completo | |
| Autor(es): |
Granato, Enzo
[1]
Número total de Autores: 1
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| Afiliação do(s) autor(es): | [1] Inst Nacl Pesquisas Espaciais, Lab Associado Sensores & Mat, BR-12227010 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 1
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| Tipo de documento: | Artigo Científico |
| Fonte: | European Physical Journal B; v. 94, n. 7 JUL 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
We study the effects of random pi Josephson junctions and applied magnetic field on the quantum phase transitions of superconducting arrays, described by a two-dimensional phase-glass model. The zero-temperature phase diagram and critical behavior are obtained from path-integral Monte Carlo simulations. A superconducting chiral-glass phase occurs for sufficiently large disorder resulting from frustration effects of the pi junctions. Unlike the superconductor-insulator transition for weak disorder, the chiral-glass to insulator transition is insensitive to additional frustration introduced by an external magnetic field corresponding to half flux quantum per plaquette. The results are consistent with recent measurements on superconducting thin films with a periodic pattern of nanoholes in an applied magnetic field and doped with magnetic impurities. The magnetic-field frustration effects for the activation energy at low doping and its disappearance at higher doping, observed experimentally, is indicative of a transition to the chiral-glass regime. (AU) | |
| Processo FAPESP: | 18/19586-9 - Dinâmica, defeitos topológicos e transições de fase em sistemas bidimensionais |
| Beneficiário: | Enzo Granato |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |