The low-temperature (< 60 K) transport properties of as-grown La0.7Sr0.3MnO3 ultrathin films, deposited by the molecular beam epitaxy, have been investigated as a function of the sample thickness (from 40 to 3.5 nm) and in the presence of an external magnetic field. With decreasing thickness, a clear low-temperature resistivity minimum slightly affected by the application of the magnetic field has been observed, and its presence has been possibly interpreted in terms of quantum interference effects. As a function of the thickness, a crossover from a three-dimensional (3D) to a two-dimensional (2D) behavior of the system takes place below 20 nm. A re-entrant 3D behavior is induced in ultrathin films by the application of large (>20 kOe) magnetic fields. Negative values of the magnetoresistance have been observed in all of the investigated samples for all of the measured magnetic fields.

Low-temperature resistivity of La0.7Sr0.3MnO3 ultra thin films: Role of quantum interference effects

Maritato L.
Writing – Original Draft Preparation
;
Barone C.
Writing – Original Draft Preparation
;
De Luca G. M.
Membro del Collaboration Group
;
Galdi A.
Data Curation
;
2006-01-01

Abstract

The low-temperature (< 60 K) transport properties of as-grown La0.7Sr0.3MnO3 ultrathin films, deposited by the molecular beam epitaxy, have been investigated as a function of the sample thickness (from 40 to 3.5 nm) and in the presence of an external magnetic field. With decreasing thickness, a clear low-temperature resistivity minimum slightly affected by the application of the magnetic field has been observed, and its presence has been possibly interpreted in terms of quantum interference effects. As a function of the thickness, a crossover from a three-dimensional (3D) to a two-dimensional (2D) behavior of the system takes place below 20 nm. A re-entrant 3D behavior is induced in ultrathin films by the application of large (>20 kOe) magnetic fields. Negative values of the magnetoresistance have been observed in all of the investigated samples for all of the measured magnetic fields.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/1534874
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 48
  • ???jsp.display-item.citation.isi??? 50
social impact