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Contact Details

Postal Address

Dr Thomas Gruner
Cavendish Laboratory
J J Thomson Avenue
Cambridge CB3 0HE
United Kingdom

Phone & Fax

Office: +44 1223 337081
Fax: +44 1223 337351

E-mail

tg424 (at) cam.ac.uk

Researcher Profiles

ResearcherID: C-8059-2014
ORCID (Open Researcher and Contributor ID): 0000-0001-6179-8499
Loop profile: 280830

Dr. Thomas Gruner


Thomas Gruner
   

Research Interests

I am a Feodor Lynen Fellow of the German Alexander von Humboldt Foundation and a Schlumberger Research Fellow at Darwin College, Cambridge. In the Quantum Matter group at the Cavendish Laboratory I am investigating novel materials that can be used either for solid state refrigeration or to explore emergent correlated electronic states at low temperatures.

An important part of my project is devoted to new metallic rare earth-based compounds, which combine the local moment nature of f-electron states with the itinerant nature of the metallic matrix in which the rare earth atoms are embedded. I am interested in the fundamental physics which causes ultra-weak intersite exchange interactions between electrons in neighbouring f-shells. This, together with ultra-low ordering temperatures can produce a colossal magnetocaloric effect, making this type of new materials very favourable candidates for new refrigerants in adiabatic demagnetisation cooling. Their high, metallic thermal conductivity and the much higher entropy density available in these metallic magnetocalorics can bring about an order of magnitude in performance improvement with respect to traditional refrigerants, which are typically based on paramagnetic salts.

Furthermore, I will focus on fundamental science which investigates novel electronic states. Frequently, they replace well-known ordered states close to quantum critical points. Such a special point denotes a second-order phase transition exactly at absolute zero (0K = -273.15 C). Since it is experimentally not accessible, it is essential to identify second-order transitions at finite temperatures, followed by continuous suppression of this transition by tuning non-thermal control parameters. I will map comprehensive phase diagrams by applying high magnetic fields, chemical substitution or high pressures.
Since high-quality samples are imperative, I will synthesise promising new materials with different techniques. For the most interesting compounds I will optimise the preparation process and grow single crystals using an appropriate method.

Publications

(Please visit my researcher profiles)

ResearcherID, ORCID or loop
1st of October 2019