Proximity Driven Commensurate Pinning in YBa2Cu3O7 through All-Oxide Magnetic Nanostructures
M Rocci1,2, J Azpeitia3,2, J Trastoy4,5
1GFMC, Dpto. Fisica Aplicada III, Univ. Complutense Madrid , 28040 Madrid, Spain.
Nano Letters
|October 7, 2015
Summary
Ordered oxide nanostructures offer a new method for controlling superconductivity in cuprates. This research demonstrates a novel vortex pinning mechanism using ferromagnetic nanodots, enhancing critical current for applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Superconductivity
Background:
- Artificial vortex pinning landscapes are crucial for large-scale cuprate superconductor applications.
- Disordered nanometric inclusions can enhance critical current but ordered nanostructures remain unexplored due to fabrication challenges and small coherence lengths.
Purpose of the Study:
- To investigate the effect of ordered oxide nanostructures on vortex pinning in cuprates.
- To explore novel vortex pinning mechanisms at manganite-cuprate interfaces.
Main Methods:
- Fabrication of YBCO films with ordered arrays of LCMO ferromagnetic nanodots.
- Investigation of vortex nucleation and pinning phenomena at the oxide interfaces.
Main Results:
- Demonstrated long-range suppression of superconductivity at manganite-cuprate interfaces.
- Observed commensurate vortex pinning in YBCO films with ordered LCMO nanodots.
- Identified proximity-induced reduction of condensation energy near nanodots as the pinning mechanism.
Conclusions:
- Ordered all-oxide nanostructures provide a powerful new route for artificial manipulation of vortex matter in cuprates.
- This approach offers enhanced friction between nanodot arrays and vortex lattices, improving critical current.
Related Concept Videos
02:42Valence Bond Theory
11.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.7K
01:31Ferromagnetism
3.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.5K
03:02Colors and Magnetism
14.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.6K
02:33Lattice Centering and Coordination Number
15.5K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Types of Unit Cells
Imagine taking a large number of identical...
15.5K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.9K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.9K