Probing the phase diagram of cuprates with YBa2Cu3O7−δ thin films and nanowires
Artikel i vetenskaplig tidskrift, 2018

We have grown and characterized 30-nm-thick YBa2Cu3O7−δ (YBCO) films, deposited by pulsed laser deposition on both MgO (110) and SrTiO3 (001) substrates, which induce opposite strain to the superconducting layer. By carefully tuning the in situ post-annealing oxygen pressure, we achieved, in a reproducible way, films at different oxygen doping, spanning from the slightly overdoped down to the strongly underdoped region of the phase diagram. The transport properties of the films, investigated through resistance versus temperature measurements, are in perfect qualitative agreement with single crystals. Starting from these films, we have also successfully fabricated nanowires with widths down to 65 nm, at different oxygen doping. The nanostructures exhibit characteristic temperatures (as the critical temperature Tc and the pseudogap temperature T∗) similar to those of the as-grown films and carry critical current densities Jc close to the critical depairing value, limited by vortex entry. This implies that the superconducting and the normal state properties of underdoped YBCO are preserved in our films, and they can be studied as a function of the dimensionality of the system, down to the nanoscale.

YBCO

Underdoped

High-Temperature Superconductors

Thin-Film

Nanoscale

Nanowires

Författare

Riccardo Arpaia

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Eric Andersson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Edoardo Trabaldo

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physical Review Materials

2475-9953 (eISSN)

Vol. 2 024804

Infrastruktur

Nanotekniklaboratoriet

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1103/PhysRevMaterials.2.024804

Mer information

Senast uppdaterat

2018-03-21