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The position is placed at the Department of Earth Sciences (www.geo.uu.se). The Department has six programs engaged in a collaborative research of high international standard. The high-pressure group performs experimental studies on materials at extreme conditions of pressures and temperatures, pursuing interdisciplinary projects across research fields of physics, chemistry, mineralogy and materials science. The research will be conducted in a close collaboration with colleagues from the departments of chemistry and physics, which facilitates access to the relevant infrastructure at the Ångström Laboratory.
Project description: The project builds on the synthesis of a larger range of Tsai-type quasicrystals (QC) and approximant crystals (AC) in the systems RE-Au-E (RE=Lanthanides, Y, Sc, Ca; E = Si, Ge, Sn, Al, Ga, In), which is part of a parallel research project. Within this project, these materials will undergo a rigorous characterization of their atomic/nuclear structures and their magnetic properties. The research studies will focus on the application of neutron scattering for elucidating spin interactions in Tsai-type QCs and ACs, and for probing pressure induced magnetic transitions and long-range ordering. It is envisioned to perform neutron diffraction and inelastic neutron scattering experiments at the facilities SNS and HFIR (ORNL, USA), ISIS (UK) and ILL (France). The project will thus involve applying for and travelling to these international facilities. The goal is to conduct these experiments on single crystals/grain specimens at pressures up to 10 GPa and at 1-2 K temperature. The use of high pressure will enable probing the electronic states and nature of magnetic interactions, as well as conversion of spin-glass states into ordered magnetic structures. Magnetic susceptibility, magnetization, magnetoresistance and Hall Effect will be measured using MPMS/MPMS under pressure in a diamond anvil cell (DAC). Sub-Kelvin temperatures, which are necessary for systematic studies into quantum criticality, will be reached with a dilution refrigerator. As an important complement to the diffraction experiments at large-scale facilities; in-house X-ray diffraction will be used to carefully characterize the nuclear structures of the samples. The results are expected to make a decisive contribution to the fundamental question whether Tsai-type QCs containing RE elements can display unique magnetic structures and properties based on the ordering of spins in a quasiperiodic structure. The outlined research will also involve the development of state-of-the-art infrastructure, allowing small quasicrystals (~100 μm) to be characterised with respect to various physical properties under previously unexplored pressures and temperatures.
SwedNESS: The project is a part of SwedNESS, the national graduate school for Neutron research. The graduate school aims at strengthening Sweden’s long-term competence and competitiveness within the area of neutron science by providing its students with research training and a foundation for networking. Please see link for more information http://swedness.se/.
Duties: The main duties of doctoral students are to devote themselves to their research studies, which includes participating in research projects and third cycle courses. The work duties can also include teaching and other departmental duties (no more than 20%).
The student is expected to study QCs and ACs within the system RE-Au-E described above. The student will utilise a combination of techniques to characterise the structure and properties with a key focus on neutron diffraction and inelastic neutron scattering. In addition, the student will take initiative to gain access to and utilise other methods to support the core project, through either collaboration or performing the work himself or herself. The student must design, plan and execute the experimental work, occasionally in collaboration with other researchers nationally and internationally, critically analyse and discuss the results, and present their work orally at scientific conferences and written in the form of papers in peer-reviewed journals. Finally, the student is expected to participate in all mandatory group activities, including becoming the responsible person for specific lab equipment.
Admission requirements: A person meets the general admission requirements for third-cycle courses and study programmes if he or she:
- has been awarded a second-cycle qualification, or
- has satisfied the requirements for courses comprising at least 240 credits of which at least 60 credits were awarded in the second cycle, or
- has acquired substantially equivalent knowledge in some other way in Sweden or abroad.
- degree or equivalent as above in natural or engineering sciences
- very good oral and written proficiency in English.
- high motivation and strong interest in experimental studies utilizing neutrons as a probing tool.
Additional qualifications: Prior experience with the Rietveld method, INS, high pressure DAC technique, aforementioned analytical techniques, and/or performing experiments at major facilities, is considered as an important qualifying merit.
Consideration will also be given to good organisational discipline, collaborative skills, drive and willingness to take initiative, enthusiasm and independence. Finally, how the applicant, through his or her experience and skills, is deemed to have the abilities necessary for successfully completing the third cycle programme.
Rules governing PhD students are set out in the Higher Education Ordinance chapter 5, §§ 1-7 and in Uppsala University’s rules and guidelines http://regler.uu.se/?languageId=1.
Application procedure: The application should include a statement of research interest, CV, certificates of exams, degrees and grades, a copy of Master thesis, published articles or relevant materials, if available. Also, contact information of at least two reference persons should be included.
Salary: According to local agreement for PhD students.
Starting date: 01-02-2021 or as otherwise agreed.
Type of employment: Temporary position according to the Higher Education Ordinance chapter 5 § 7.
Scope of employment: 100 %.
Please submit your application by 23 DEcember 2020, UFV-PA 2020/4535.
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Submit your application through Uppsala University’s recruitment system.
Placement: Department of Earth Sciences
Type of employment: Full time , Temporary position longer than 6 months
Pay: Fixed salary
Number of positions: 1
Working hours: 100 %
County: Uppsala län
Union representative: ST/TCO firstname.lastname@example.org
Seko Universitetsklubben email@example.com
Number of reference: UFV-PA 2020/4535
Last application date: 2020-12-23
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Post expires on Wednesday December 23rd, 2020