GIAN MARCO PUGLIESE

Dottore di ricerca

ciclo: XXXV


supervisore: Naurang L. Saini

Titolo della tesi: Study of the functional-local structure relationship of some disordered systems

Disordered systems are encountered in numerous areas of research and have diverse applications in various fields. For instance, disordered materials are widely used in electronic devices, catalysis, and energy conversion, and understanding their structure and behavior is of utmost importance for improving their performance. In condensed matter physics, disordered systems are prevalent, and their properties are essential in understanding the behavior of materials such as amorphous solids and glasses. Disordered systems are also encountered in biological systems such as protein folding, where the local structure is crucial in determining the protein’s function. Disordered systems can exhibit intriguing properties such as localization, where a particle’s motion is constrained to a small region, leading to unusual diffusion behavior. The structural disorder can also lead to the emergence of non-equilibrium phenomena such as glassy dynamics, where the material appears to be stuck in a frozen state. Understanding the local structure of disordered systems is key to explaining their properties and behavior. Local structural motifs and correlations can provide insights into the system’s overall behavior and help establish predictive models. Tailoring the local structure of disordered systems can allow for the creation of materials with specific functionalities such as controlling electronic conductivity, catalytic activity, and thermal insulation. X-ray absorption spectroscopy (XAS) is a powerful technique for probing the local structure and electronic properties of materials, particularly at the atomic level. In this context, we have carried out XAS measurements on BiS2-based systems, high-entropy alloys (HEAs) and highly disordered systems such as TMs oxides and nanoparticles to investigate their local structure and electronic properties. In summary, we have found that the functional properties in BiS2-materials are driven by both the Bi-S axial bond distance and the in-plane BiS2 distortion acting on the charge transfer mechanism and the charge mobility, respectively. The high susceptibility of the local structure to external stimuli such as doping, chemical pressure and temperature makes these materials of particular interest for tailoring the local structure for the desired properties. The local structure also affects the metal-insulator transition in the TMO Ba3Nb5-xTixO15 driven by the local octahedral distortion and configuration disorder rather than temperature. Further studies on thermal conductivity and Seebeck coefficient could optimize the thermoelectric properties of these materials by manipulating local disorder through substitution. Then, we have found that the Zr-Zr network in the TrZr2 become more rigid increasing the configurational entropy suggesting the presence of nanoscale texturing and possible local order like granular materials.

Produzione scientifica

11573/1721922 - 2024 - Anisotropic atomic displacements, local orthorhombicity and anomalous local magnetic moment in Ba0.6K0.4Fe2As2 superconductor
Tortora, L.; Tomassucci, G.; Pugliese, G. M.; Hacisalihoglu, M. Y.; Simonelli, L.; Marini, C.; Das, G.; Ishida, S.; Iyo, A.; Eisaki, H.; Mizokawa, T.; Saini, N. L. - 01a Articolo in rivista
rivista: PHYSICAL CHEMISTRY CHEMICAL PHYSICS (Thomas Graham House, Science Park, Cambridge: Royal Society of Chemistry) pp. 22454-22462 - issn: 1463-9076 - wos: (0) - scopus: (0)

11573/1680116 - 2023 - Temperature dependent local inhomogeneity and magnetic moments of (Li1−xFex)OHFeSe superconductors
Tomassucci, G.; Tortora, L.; Pugliese, G. M.; Stramaglia, F.; Simonelli, L.; Marini, C.; Terashima, K.; Wakita, T.; Ayukawa, S.; Yokoya, T.; Kudo, K.; Nohara, M.; Mizokawa, T.; Saini, N. L. - 01a Articolo in rivista
rivista: PHYSICAL CHEMISTRY CHEMICAL PHYSICS (Thomas Graham House, Science Park, Cambridge: Royal Society of Chemistry) pp. 6684-6692 - issn: 1463-9076 - wos: WOS:000935227200001 (1) - scopus: 2-s2.0-85148667013 (1)

11573/1622396 - 2022 - Morphological, electronic, and magnetic properties of multicomponent cobalt oxide nanoparticles synthesized by high temperature arc plasma
Das, A.; Balasubramanian, C.; Orpe, P.; Pugliese, G. M.; Puri, A.; Marcelli, A.; Saini, N. L. - 01a Articolo in rivista
rivista: NANOTECHNOLOGY (Bristol, United Kingdom: IOP Publishing Limited) pp. 095603- - issn: 0957-4484 - wos: WOS:000728369600001 (1) - scopus: 2-s2.0-85121761144 (2)

11573/1663258 - 2022 - The local structure and metal-insulator transition in a Ba3Nb5-xTixO15 system
Pugliese, G M; Capone, F G; Tortora, L; Stramaglia, F; Simonelli, L; Marini, C; Kondoh, Y; Kajita, T; Katsufuji, T; Mizokawa, T; Saini, N L - 01a Articolo in rivista
rivista: MATERIALS (Basel: Molecular Diversity Preservation International-MDPI) pp. 4402- - issn: 1996-1944 - wos: WOS:000823901000001 (3) - scopus: 2-s2.0-85133154802 (3)

11573/1680117 - 2022 - Possible local order in the high entropy TrZr2 superconductors
Pugliese, G. M.; Tortora, L.; Tomassucci, G.; Kasem, R. Md.; Mizokawa, T.; Mizuguchi, Y.; Saini, N. L. - 01a Articolo in rivista
rivista: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS (Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010) pp. 111154- - issn: 0022-3697 - wos: WOS:000911043000001 (1) - scopus: 2-s2.0-85144253732 (2)

11573/1680114 - 2022 - Determination of the local structure of the La0.5-xNa0.5+xFe2As2 superconductor
Pugliese, Gm; Simonelli, L; Tortora, L; Tomassucci, G; Iyo, A; Eisaki, H; Mizokawa, T; Saini, Nl - 01a Articolo in rivista
rivista: PHYSICAL REVIEW. B (Ridge NY: American Physical Society, [2016-]) pp. - - issn: 2469-9950 - wos: WOS:000747403700001 (3) - scopus: 2-s2.0-85123763093 (3)

11573/1622401 - 2021 - The Local Structure of the BiS2 Layer in RE(O,F)BiS2 Determined by In-Plane Polarized X-ray Absorption Measurements
Pugliese, G. M.; Tortora, L.; Paris, E.; Wakita, T.; Terashima, K.; Puri, A.; Nagao, M.; Higashinaka, R.; Matsuda, T. D.; Aoki, Y.; Yokoya, T.; Mizokawa, T.; Saini, N. L. - 01a Articolo in rivista
rivista: PHYSCHEM (Basel: MDPI) pp. 250-258 - issn: 2673-7167 - wos: (0) - scopus: (0)

11573/1561404 - 2021 - Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe4As4 Iron-Based Superconductor
Stramaglia, F.; Pugliese, G. M.; Tortora, L.; Simonelli, L.; Marini, C.; Olszewski, W.; Ishida, S.; Iyo, A.; Eisaki, H.; Mizokawa, T.; Saini, N. L. - 01a Articolo in rivista
rivista: JOURNAL OF PHYSICAL CHEMISTRY. C (Washington, D.C.: American Chemical Society, c1997-) pp. 10810-10816 - issn: 1932-7447 - wos: WOS:000655640900064 (7) - scopus: 2-s2.0-85106393533 (7)

11573/1495339 - 2020 - The local structure of self-doped BiS2-based layered systems as a function of temperature
Pugliese, G. M.; Paris, E.; Capone, F. G.; Stramaglia, F.; Wakita, T.; Terashima, K.; Yokoya, T.; Mizokawa, T.; Mizuguchi, Y.; Saini, N. L. - 01a Articolo in rivista
rivista: PHYSICAL CHEMISTRY CHEMICAL PHYSICS (Thomas Graham House, Science Park, Cambridge: Royal Society of Chemistry) pp. 22217-22225 - issn: 1463-9076 - wos: WOS:000581179800004 (5) - scopus: 2-s2.0-85093539458 (5)

11573/1495336 - 2020 - Local structure displacements in La1−xCexOBiSSe as a function of Ce substitution
Pugliese, G. M.; Stramaglia, F.; Capone, F. G.; Hacisalihoglu, M. Y.; Kiyama, R.; Sogabe, R.; Goto, Y.; Pollastri, S.; De Souza, D. O.; Olivi, L.; Mizokawa, T.; Mizuguchi, Y.; Saini, N. L. - 01a Articolo in rivista
rivista: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS (Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010) pp. - - issn: 0022-3697 - wos: WOS:000567084700021 (6) - scopus: 2-s2.0-85087721681 (6)

11573/1383606 - 2019 - The local structure of the Ca0.9Pr0.1Fe2As2 superconductor as a function of temperature
Paris, E.; Wakita, T.; Simonelli, L.; Marini, C.; Olszewski, W.; Terashima, K.; Stramaglia, F.; Pugliese, G. M.; Mizokawa, T.; Ioka, S.; Kudo, K.; Nohara, M.; Yokoya, T.; Saini, N. L. - 01a Articolo in rivista
rivista: SUPERCONDUCTOR SCIENCE & TECHNOLOGY (Bristol, United Kingdom: IOP Publishing Limited) pp. 095001- - issn: 0953-2048 - wos: WOS:000476594300001 (4) - scopus: 2-s2.0-85072124182 (4)

11573/1383620 - 2019 - Temperature dependent local atomic displacements in NaSn2As2 system
Pugliese, G. M.; Stramaglia, F.; Goto, Y.; Terashima, K.; Simonelli, L.; Fujiwara, H.; Puri, A.; Marini, C.; Hacisalihoglu, M. Y.; D'acapito, F.; Yokoya, T.; Mizokawa, T.; Mizuguchi, Y.; Saini, N. L. - 01a Articolo in rivista
rivista: JOURNAL OF PHYSICS. CONDENSED MATTER (IOP Publishing Limited:Dirac House, Temple Back, Bristol BS1 6BE United Kingdom:011 44 117 9297481, EMAIL: custserv@iop.org, INTERNET: http://www.iop.org, Fax: 011 44 117 9294318) pp. - - issn: 0953-8984 - wos: WOS:000476903500002 (4) - scopus: 2-s2.0-85071711666 (5)

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