Dr Sven Friedemann
Dr.rer.nat.
Expertise
My research focuses on tuning correlations in metals, insulators, and semiconductors with hydrostatic pressure. Using transport, thermodynamic, and magnetic measurements I aim to enhance our understanding of electronic behavior.
Current positions
Associate Professor
School of Physics
Contact
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Biography
I conducted my PhD research project at the Max-Planck Institute for Chemical Physics of Solids and obtained a Dr. rer. nat. from the Technical University Dresden, Germany with distinction in 2009. Here, I performed high-resolution Hall effect measurements in crossed magnetic fields and established a Fermi surface reconstrution in the prototypical quantum critical material YbRh2Si2.
From 2010 to 2013 I worked as a research fellow at the University of Cambridge first on a Feodor-Lynen fellowship of the Alexander von Humboldt foundation and later on a Marie Curie fellowship of the European Research Council. My research focused on electronic structure studies using quantum oscillation measurements in combination with band structure calculations. In addition, I pioneered new pressure techniques which I utilized to perform Fermi surface studies under pressure.
In 2013, I joined the University of Bristol as a Lecturer and have since been promoted to Associate Professor. My group's work focuses on high-pressure studies of high-temperature sueprcondcutors including cuprate, hydride, and iron-pnictide superconductors as well as exotic magnetic and charge-ordered materials.
Research interests
My research focuses on tuning correlations in metals, insulators, and semiconductors with hydrostatic pressure. Using transport, thermodynamic, and magnetic measurements I aim to enhance our understanding of electronic behavior.
One focus of my research is to map the evolution of the Fermi surface whilst tuning materials from one ground state into another, e.g. from an antiferromagnet into a paramagnet. Strong correlations have been observed in such cases to lead to novel states like unconventional superconductivity. Here, I utilize quantum oscillation measurements to unravel the underlying electronic structure changes which can provide important input to theories of unconventional superconductivity.
Projects and supervisions
Research projects
8097 Room-Temperature Superconductivity in Hydrogen Cage Compounds
Principal Investigator
Managing organisational unit
School of PhysicsDates
01/06/2021 to 31/05/2024
EPSRC Equipment Award 2020 - Thin Film Evaporator for Air sensitive materials
Principal Investigator
Managing organisational unit
Science Faculty OfficeDates
15/11/2020 to 15/05/2022
EPSRC Equipment award 2020 - VSM Magnetometer upgrade
Principal Investigator
Managing organisational unit
Science Faculty OfficeDates
15/11/2020 to 15/05/2022
HPSuper
Principal Investigator
Description
Superconductors promote electrical currents without loss and are exploited for applications like magnets in medical imaging. Further applications like large scale usage in electrical power generation and transmission, however, are…Managing organisational unit
School of PhysicsDates
01/02/2017 to 31/01/2022
High-pressure studies of Charge-Density-Wave Superconductors
Principal Investigator
Managing organisational unit
School of PhysicsDates
01/07/2016 to 30/06/2018
Thesis supervisions
Characterisation of the high pressure - high temperature phase diagram of ruthenium
Supervisors
Electrical Transport Studies In Superconductors At Extreme Pressures
Supervisors
Extending the application range of Z-pins in composites
Supervisors
The synthesis of nanostructured functional metal oxides
Supervisors
Electronic transport studies of heavy fermion ferromagnet YbNi4P2
Supervisors
Magnetotransport studies of strong correlations and superconductivity in strange and quantum critical metals
Supervisors
Correlated Electron Systems Under Extreme Conditions
Supervisors
Superconducting Gap Measurements at Extreme Conditions
Supervisors
Publications
Recent publications
22/02/2024Absence of induced ferromagnetism in epitaxial uranium dioxide thin films
Physical Review B
High-temperature superconductivity in La4H23 below 100 GPa
Physical Review B
Rapid sol–gel synthesis of honeycomb-layered Na3Ni2BiO6 and orthorhombic Na3Ca2BiO6
Dalton Transactions
Truncated mass divergence in a Mott metal
Proceedings of the National Academy of Sciences
Clean-limit superconductivity in Im3¯m H3S synthesized from sulfur and hydrogen donor ammonia borane
Physical Review B
Teaching
I have taught a variety of undergraduate and graduate courses ranging from 1st year lab demonstration via the 4th year lecture course on Magnetism and Superconductivity, to the postgraduate training course on high-pressure methods.
For my lecture course on Magnetism and Superconductivity, I was awarded the student-led teaching prize.