A5071319170- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- ZnO doping and properties
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- 2D Materials and Applications
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Magnetic properties of thin films
- MXene and MAX Phase Materials
- Superconducting Materials and Applications
- Graphene research and applications
- Frequency Control in Power Systems
- Semiconductor materials and devices
- Copper-based nanomaterials and applications
- Characterization and Applications of Magnetic Nanoparticles
- Superconductivity in MgB2 and Alloys
- HVDC Systems and Fault Protection
- Chalcogenide Semiconductor Thin Films
- Magnetic Properties and Synthesis of Ferrites
- Topological Materials and Phenomena
- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
University of Chinese Academy of Sciences
2019-2024
Institute of Physics
2024
Institut de Ciència de Materials de Barcelona
2011-2020
Instituto de Nanociencia y Materiales de Aragón
2016-2020
Consejo Superior de Investigaciones Científicas
2013-2020
Universidad de Zaragoza
2015-2019
Universitat Autònoma de Barcelona
2013-2017
Universidad de Guanajuato
2012
General Atomics (United States)
1993-1998
Hafnium oxide-based ferroelectric materials are promising candidates for next-generation nanoscale devices because of their ability to integrate into silicon electronics. However, the intrinsic high coercive field fluorite-structure oxide leads incompatible operating voltage and limited endurance performance. We discovered a complementary metal-oxide semiconductor (CMOS)-compatible rhombohedral Hf(Zr)1+xO2 material rich in hafnium-zirconium [Hf(Zr)]. X-ray diffraction combined with scanning...
Abstract The explosive growth of massive‐data storage and the demand for ultrafast data processing require innovative memory devices with exceptional performance. 2D materials their van der Waal heterostructures atomically sharp interfaces hold great promise innovations in devices. Here, this work presents non‐volatile, floating‐gate all functional layers made materials, achieving programming/erasing speeds (20 ns), high extinction ratios (up to 10 8 ), multi‐bit capability. These also...
An oriented attachment and growth mechanism allows an accurate control of the size morphology Cu(2-x)S nanocrystals, from spheres disks to tetradecahedrons dodecahedrons. The synthesis conditions are detailed here.
We report the chemical vapor deposition (CVD) growth, characterization, and low-temperature magnetotransport of 1T phase multilayer single-crystalline VTe2 nanoplates. The transport studies reveal that no sign intrinsic long-range ferromagnetism but localized magnetic moments exist in individual metallic give rise to Kondo effect, evidenced by logarithmical increment resistivity with decreasing temperature negative magnetoresistance (NMR) regardless direction field at temperatures below...
Abstract The achievement of high growth rates in YBa 2 Cu 3 O 7 epitaxial high-temperature superconducting films has become strategic to enable high-throughput manufacturing long length coated conductors for energy and large magnet applications. We report on a transient liquid assisted process capable achieving ultrafast (100 nm s −1 ) critical current densities (5 MA cm −2 at 77 K). This is based the kinetic preference Ba-Cu-O form liquids prior crystalline thermodynamic equilibrium phases,...
The development of electrically ultrafast-programmable semiconductor homojunctions can lead to transformative multifunctional electronic devices. However, silicon-based are not programmable so that alternative materials need be explored. Here 2D, multi-functional, lateral made van der Waals heterostructures with a semi-floating-gate configuration on p++ Si substrate feature atomically sharp interfaces and electrostatically programmed in nanoseconds, more than seven orders magnitude faster...
Epitaxial films of ${\mathrm{SrMnO}}_{3}$ and bilayers ${\mathrm{SrMnO}}_{3}/{\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3}$ have been deposited by pulsed laser deposition on different substrates, namely, ${\mathrm{LaAlO}}_{3}$ (001), $({\mathrm{LaAlO}}_{3}{)}_{0.3}({\mathrm{Sr}}_{2}{\mathrm{AlTaO}}_{6}{)}_{0.7}$ ${\mathrm{SrTiO}}_{3}$ allowing us to perform an exhaustive study the dependence antiferromagnetic order exchange bias field epitaxial strain. The N\'eel temperatures...
Engineering defects and strains in oxides provides a promising route for the quest of thin film materials with coexisting ferroic orders, multiferroics, efficient magnetoelectric coupling at room temperature. Precise control strain gradient would enable custom tailoring multiferroic properties but presently remains challenging. Here we explore existence polar-graded state epitaxially strained antiferromagnetic SrMnO3 films, whose polar nature was predicted theoretically recently demonstrated...
In-field angular pinning performances at different temperatures have been analysed on chemical solution deposited (CSD) YBa2Cu3O7−x (YBCO) pristine films and nanocomposites. We show that with this analysis we are able to quantify the vortex strength energies, associated kinds of natural artificial defects, acting as efficient centres regions H–T phase diagram. A good quantification variety defects active magnetic fields provides a unique tool design best landscape under operating conditions....
Natural superlattice structures MnBi2Te4(Bi2Te3)n (n = 1, 2, ...), in which magnetic MnBi2Te4 layers are separated by nonmagnetic Bi2Te3 layers, hold band topology, magnetism and reduced interlayer coupling, providing a promising platform for the realization of exotic topological quantum states. However, their two-dimensional limit, is crucial further exploration phenomena, remains elusive. Here, complex ferromagnetic-antiferromagnetic coexisting ground states that persist down to 2-septuple...
The preparation and manipulation of crystalline yet bendable functional complex oxide membranes has been a long-standing issue for myriad applications, in particular, flexible electronics. Here, we investigate the viability to prepare magnetic CoFe2O4 (CFO) by means Sr3Al2O6 (SAO) sacrificial layer approach using chemical deposition techniques. Meticulous structural study SAO surface SAO/CFO interface properties have allowed us identify formation an amorphous capping carbonates upon air...
Monolayer Six Cy constitutes an important family of 2D materials that is predicted to feature a honeycomb structure and appreciable bandgaps. However, due its binary chemical nature the lack bulk polymorphs with layered structure, fabrication such has so far been challenging. Here, synthesis atomic monolayer Si9 C15 on Ru (0001) Rh(111) substrates reported. A combination scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), transmission electron (STEM), density...
The manipulation of two-dimensional (2D) magnetic order is significant importance to facilitate future 2D magnets for low-power and high-speed spintronic devices. van der Waals stacking engineering makes promises controllable magnetism via interlayer coupling. However, directly examining the changes accompanying transitions at atomic scale preparing device-ready with orders remain elusive. Here, we demonstrate effective control in exfoliated CrBr3 thermally assisted strain engineering....
Abstract 2D transition metal dichalcogenides (TMDs) exhibit remarkable properties that are strongly influenced by their atomic structures, as well various types of defects and interfaces can be precisely engineered controlled. These features make TMDs TMD‐based materials highly promising for a wide range applications in electronics, optoelectronics, magnetism, spintronics, catalysis, energy, etc. By providing comprehensive approach to understand the structure–property–functionality...
We present a thorough study of the nucleation and growth processes solution-based YBa2Cu3O7–Ba2YTaO6 (YBCO–BYTO) system, carried out with view to controlling characteristics BYTO phase meet requirements for specific power applications. Scanning transmission electron microscopy x-ray diffraction have been used characterize evolution during YBCO–BYTO conversion. At high loads (>10 mol%), nanoparticles tend aggregate, resulting in much less efficiency generating nanostrained areas YBCO matrix,...
Defects in ceramic materials are generally seen as detrimental to their functionality and applicability. Yet, some complex oxides, defects present an opportunity enhance of properties or even lead the discovery exciting physics, particularly presence strong correlations. A paradigmatic case is high-temperature superconductor YBa2Cu3O7-δ (Y123), which nanoscale play important role they can immobilize quantized magnetic flux vortices. Here previously unforeseen point buried Y123 thin films...
We report the epitaxial growth and superconducting properties of Y2O3-added YBa2Cu3Ox (YBCO) films grown on SrTiO3-buffered MgO substrates by pulsed-laser deposition using surface-modified YBCO targets. Areas Y2O3 sectors target were increased to 5.44% 9.22% total pellet in order find a correlation between content, morphology, pinning + mixed films. The maximum global forces, FP, at 77 K 14.3 GN m−3 1.15 for 5.44A% 9.22A%, respectively. sample presents very high value force K, approaching...
Self-intercalation of native magnetic atoms within the van der Waals (vdW) gap layered two-dimensional (2D) materials provides a degree freedom to manipulate magnetism in low-dimensional systems. Among various vdW magnets, vanadium telluride is an interesting system explore interlayer order-disorder transition impurities due its flexibility taking nonstoichiometric compositions. In this work, we combine high-resolution scanning transmission electron microscopy (STEM) analysis with density...
A mathematical model was proposed for determining the crack growth rate of hydrogen-induced cracking (HIC) in steel plates exposed to a sour gas. The assumes that extension an embedded circular results from accumulation internal hydrogen pressure produces rise stress intensity factor excess plane strain fracture toughness with dissolved hydrogen. Upon extension, volume cavity increases, and drops, causing arrest. As is filled again hydrogen, process repeated. HIC experiments were conducted...
We report on the spontaneous segregation of double perovskite Ba2YTaO6 (BYTO) nanoparticles within YBa2Cu3O7 (YBCO) films forming a nanocomposite with two ternary oxides by low cost and scalable chemical solution trifluoroacetate approach. Phase orientation, nanostructural pinning studies are carried out 2D x-ray diffraction, advanced scanning transmission electron microscopy transport measurements, respectively. In this complex oxide system (YBCO–BYTO) majority segregated (00l)-oriented...
In this letter we use high resolution scanning transmission electron microscopy to study epitaxial YBa2Cu3O7−δ (YBCO) nanocomposite thin films. We find that twin boundaries (TB) in YBCO films are disturbed by the presence of secondary phase nanoparticles as well intergrowths. Secondary phases promote nucleation TBs and, at same time, result bending, decreasing and changing TB's spacing. On other hand, local strain ensuing from partial dislocation associated Y248 Y125 intergrowths break...
We study the effect of twin boundaries (TBs) on critical current density YBa2Cu3O (YBCO) films and nanocomposites grown different substrates. Varying both direction magnetic field, we show that TB orientation is a crucial parameter to consider in optimization Jc for particular applications. A quantitative detailed analysis role TBs vortex dynamics has allowed us infer extended planes pristine YBCO can reduce by 60% at low temperatures due channeling effects or increase it 98% high...