Probing the phase diagram of cuprates with YBa2Cu3O7−δ thin films and nanowires
Journal article, 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.

Nanoscale

YBCO

Underdoped

Nanowires

Thin-Film

High-Temperature Superconductors

Author

Riccardo Arpaia

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Eric Andersson

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Edoardo Trabaldo

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Thilo Bauch

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Floriana Lombardi

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Physical Review Materials

2475-9953 (eISSN)

Vol. 2 2 024804

Functional Dirac Materials

Knut and Alice Wallenberg Foundation, 2014-07-01 -- 2019-06-30.

Spin kommunikation i Dirac Material heterostrukturer

Swedish Research Council (VR), 2017-01-01 -- 2020-12-31.

Infrastructure

Nanofabrication Laboratory

Subject Categories

Condensed Matter Physics

DOI

10.1103/PhysRevMaterials.2.024804

More information

Latest update

2/19/2019