Nanoscale competition between multiple phases in high-temperature superconductors and ferroelectrics
Event details
| Date | 06.02.2015 |
| Hour | 14:15 |
| Speaker |
Dr. Alessandro Ricci, Deutsches Elektronen-Synchrotron DESY, Hamburg Bio: Alessandro entered to the Faculty of Dentistry, University of Pisa (Italy), in 2002 and graduated with honours (magna cum laude) in 2007. After a two-year clinical training in General Dentistry at the Careggi University Hospital in Florence (Italy), he has exclusively worked in the private dental sector. Alessandro’s special clinical interests are Implantology, Prosthodontics, Cosmetic Dentistry, and he has also a consolidated experience in Invisible Orthodontics, being an accredited All-in (Micerium) and Clear-Aligner (Scheu) provider. During the years, his continuing education program has involved several postgraduate diplomas. In particular, Alessandro has gained a MSc in Orthodontics (University of L’Aquila, Italy, 2011), a Postgraduate certificate in Oral Surgery and Pathology (University of Milan-Bicocca, Italy, 2012), a Diploma in Oral Surgery and Implantology (University of Innsbruck, Austria), and he is currently taking part in a two-year MSc in Implantology at the São Paulo University (Brazil). |
| Location | |
| Category | Conferences - Seminars |
Functional materials like high temperatureintrinsic complexity. Indeed, they show a coexistence of multiple phases like Charge-Density-Wave (CDW), Spin-Density-Wave (SDW) and the defects that get organized in different nano-domains and exhibit a strong dynamic competition. The understanding of the interplay among these multiple phases is challenging because their complex spatial competition and dynamics are strongly connected to the emerging of functional properties at the macroscopic scale. The interpretation at the nanoscale of these processes will open the way to the development and optimization of new functional materials.
In order to clarify the phase’s coexistence it is important to understand their spatial-organization. On this purpose we developed innovative techniques like scanning micro X-ray diffraction (SµXRD) and resonant scanning micro X-ray diffraction (rSµXRD) to directly visualize the spatial-organization of the SDW, CDW and defects nano-domains. By the use of SµXRD on several High temperature superconductors (HTS) we evidenced a common nanoscale phase separation scenario, characterized by the coexistence of competing scale-free networks of self-organized nano-domains [1-6]. Moreover, we found that an optimum inhomogeneity is needed to promote the percolation process and the emergence of properties like superconductivity at the macroscopic scale [7]. In this process, the way how the nano-domains interact and evolve in time is still a fundamental missing point. For this reason a new experimental approach that combines temporal and spatial resolution with bulk sensitivity has been developed [8]. Combining a time-resolved scattering technique like X-ray Photon Correlation Spectroscopy (XPCS) with resonant X-ray scattering (RIXS), we were able to find peculiar slow dynamics in the nano-domains competition with high temperature superconductivity. Recently, I extended these studies to the nano-structure and dynamics of magnetic and ferroelectric materials with the aim to nano-manipulate them and design new generation materials for electronics.
References:
1. Drees, Y.*, Z. W. Li*, A. Ricci*, et al., Nature Communications 5, 5731+ (2014). (*these authors equally contribute)
2. A. Ricci, et al., New Journal of Physics 16, 053030+ (2014).
3. A. Ricci, et al., Scientific Reports 3, 2383+ (2013).
4. N. Poccia, M. Fratini, A. Ricci, et al., Nature Materials, 10, 733-736 ( 2011).
5. A. Ricci, et al., Physical Review B 84, 060511+ (2011).
6. M. Fratini, N. Poccia, A. Ricci, et al., Nature 466, 841 (2010).
7. N. Poccia, A. Ricci, et al., Proceedings of the National Academy of Sciences 109, 15685 (2012).
8. A. Ricci, Journal of Superconductivity and Novel Magnetism 1-4 (2014).
In order to clarify the phase’s coexistence it is important to understand their spatial-organization. On this purpose we developed innovative techniques like scanning micro X-ray diffraction (SµXRD) and resonant scanning micro X-ray diffraction (rSµXRD) to directly visualize the spatial-organization of the SDW, CDW and defects nano-domains. By the use of SµXRD on several High temperature superconductors (HTS) we evidenced a common nanoscale phase separation scenario, characterized by the coexistence of competing scale-free networks of self-organized nano-domains [1-6]. Moreover, we found that an optimum inhomogeneity is needed to promote the percolation process and the emergence of properties like superconductivity at the macroscopic scale [7]. In this process, the way how the nano-domains interact and evolve in time is still a fundamental missing point. For this reason a new experimental approach that combines temporal and spatial resolution with bulk sensitivity has been developed [8]. Combining a time-resolved scattering technique like X-ray Photon Correlation Spectroscopy (XPCS) with resonant X-ray scattering (RIXS), we were able to find peculiar slow dynamics in the nano-domains competition with high temperature superconductivity. Recently, I extended these studies to the nano-structure and dynamics of magnetic and ferroelectric materials with the aim to nano-manipulate them and design new generation materials for electronics.
References:
1. Drees, Y.*, Z. W. Li*, A. Ricci*, et al., Nature Communications 5, 5731+ (2014). (*these authors equally contribute)
2. A. Ricci, et al., New Journal of Physics 16, 053030+ (2014).
3. A. Ricci, et al., Scientific Reports 3, 2383+ (2013).
4. N. Poccia, M. Fratini, A. Ricci, et al., Nature Materials, 10, 733-736 ( 2011).
5. A. Ricci, et al., Physical Review B 84, 060511+ (2011).
6. M. Fratini, N. Poccia, A. Ricci, et al., Nature 466, 841 (2010).
7. N. Poccia, A. Ricci, et al., Proceedings of the National Academy of Sciences 109, 15685 (2012).
8. A. Ricci, Journal of Superconductivity and Novel Magnetism 1-4 (2014).
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphaël Butté)
Contact
- Prof. Davor Pavuna ([email protected])