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Probing electronic nematicity and anisotropic electron-phonon coupling in strained YBCO nanowires
(2024) Rongrueangkul, Karn; Chalmers tekniska högskola / Institutionen för mikroteknologi och nanovetenskap (MC2); Chalmers University of Technology / Department of Microtechnology and Nanoscience (MC2); Lombardi, Floriana; Kalaboukhov, Alexei; Bauch, Thilo
Despite nearly 40 years since its discovery in 1986, the underlying mechanism behind the high-temperature superconductivity (HTS) in cuprates remains a significant enigma in condensed matter physics. The existence of multiple intertwined local orders, originating from the strongly correlated electrons, further complicates the study of these materials. Such complexity of the normal state is depicted in a very intricate temperature-doping phase diagram. A way to advance the knowledge of these materials is to tune the local orders, both in the superconducting and in the normal state, to disentangle them for individual study. One way to achieve such an effect is to apply strain to the cuprates in nm-thick films. Previously, it was discovered that the unidirectional strain, induced by few-unit-cell-thick films deposited on a nanostructured surface, can modify the charge order and cause the in-plane resistivity of the films to become much more anisotropic than in bulk materials. According to the Boltzmann transport model, such anisotropy in the in-plane resistivity is due to the directional modification of the Fermi velocity in which the velocity along one crystallographic in-plane direction is much higher than another. This results in an anisotropic Fermi surface that connects to the presence of an electronic nematicity, wherein the electronic structure retains translational symmetry while spontaneously breaking rotational symmetry. In earlier reports on the archetypal HTS YBa2Cu3O7−δ (YBCO) superconductor, the photoemission and transport measurements appear to show that electron-phonon coupling (EPC) can become directionally suppressed if the Fermi surface becomes nematic (as in our sample). This should strongly affect the heat transport in nm-thick YBCO films. Hence, the focus of this thesis work is to investigate the anisotropic EPC through the study of electrical and heat transport properties of YBCO nanowires oriented along different crystallographic axes. The nanowires are fabricated from YBCO thin films epitaxially grown by the Pulsed Laser Deposition technique, and the strain is tuned by modifying the film thickness.
Aircraft simulations using hydrogen as an energy carrier
(2023) Hall, Jonathan; Mustafha, Mohamed; Shanbhag, Shashank Gobalkrishna; Chalmers tekniska högskola; Chalmers University of Technolog; Wickman, Björn; Grönstedt, Tomas
Extra High Tensile Steel Applications for RoPax ferries
(2024) Ribeiro Da Silva Mangas Pereira, Ana Carolina; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Chalmers University of Technology / Department of Mechanics and Maritime Sciences; Li, Zhiyuan; Li, Zhiyuan
From Learning to Execution: A General Interface for Kinesthetic Teaching in Robotics
(2024) Ahlebrand, Hampus; Chalmers tekniska högskola / Institutionen för elektroteknik; Dean, Emmanuel; Ramirez, Karinne
Post-extraction matters; re-programming Smöjen limestone quarry through landscape-based design
(2023) Ahlklo, Sys; Chalmers tekniska högskola / Institutionen för arkitektur och samhällsbyggnadsteknik (ACE); Chalmers tekniska högskola / Institutionen för arkitektur och samhällsbyggnadsteknik (ACE); Adelfio, Marco; Björling, Nils
With the disused quarry at Smöjen, Gotland as a context, this thesis asks the question How can architects take responsibility for the use of materials when re-programming post-industrial landscapes? The thesis aims at highlighting the necessity of conscious use of materials by utilizing the landscape. The argument is being made that the physical limitations that come with a landscape-based design could be formulated as a creative framework that opens up for interesting solutions while avoiding depletion of recourses. As a result of mining natural resources on an ever-increasing scale, the amount of extraction sites have multiplied. Today, there are rules and guidelines for the rehabilitation of quarries, but quarries from before the 1970s have not been subject to rehabilitation in the same way. The harsh landscape alterations of dis-used quarries make the landscape-rehabilitation process slow, but the same barren landscape with its traces from past lives have proven to attract an increasing number of visitors. Smöjen is subject to this increasing tourism meanwhile in need of rehabilitation to prevent potential safety hazards. Regionally, Smöjen is defined as an area of development in the larger context of the Gotland archipelago. The thesis proposes an intervention at Smöjen limestone quarry, focusing on three support structures for information, visits and accommodation, using the existing landscape and material remains as a design framework. Literature research, archive visits and extensive site explorations have informed the design proposal. In addition, an extension of the hiking trail S:t Olofsleden is proposed, adding context to Smöjen and other already established visitor destinations along the north-east coast. The thesis focuses on the understanding of the material in the early phases of the design process. The proposal preserves and strengthens the identity of Smöjen, demonstrating concept development in relation to material use and circularity and contributes to the discussion regarding the architect as consumer of building materials.