The ground-state properties of new (RE, U) nTIn3n+2 intermetallic compounds
| Thesis title in Czech: | Studium základního stavu nových intermetalických sloučenin (RE, U) nTIn3n+2 |
|---|---|
| Thesis title in English: | The ground-state properties of new (RE, U) nTIn3n+2 intermetallic compounds |
| Key words: | intermetalické sloučeniny na bázi vzácných zemin a uranu, příprava monokrystalů, supravodivost a magnetismus |
| English key words: | Rare-earth and Uranium Intermetallic Compounds, Single crystal growth, Superconductivity and Magnetism |
| Academic year of topic announcement: | 2011/2012 |
| Thesis type: | dissertation |
| Thesis language: | angličtina |
| Department: | Department of Condensed Matter Physics (32-KFKL) |
| Supervisor: | Dr. rer. nat. Jeroen Custers |
| Author: | hidden - assigned and confirmed by the Study Dept. |
| Date of registration: | 26.09.2011 |
| Date of assignment: | 26.09.2011 |
| Confirmed by Study dept. on: | 29.12.2011 |
| Date and time of defence: | 07.09.2015 09:00 |
| Date of electronic submission: | 20.07.2015 |
| Date of submission of printed version: | 20.07.2015 |
| Date of proceeded defence: | 07.09.2015 |
| Opponents: | prof. Mohsen Abd-Elmeguid |
| Frank Roelof De Boer | |
| Advisors: | prof. RNDr. Vladimír Sechovský, DrSc. |
| doc. RNDr. Jan Prokleška, Ph.D. | |
| Guidelines |
| The competition between the long-range magnetic order as a result of the RKKY mechanism and the paramagnetic ground state due to Kondo shielding of the magnetic moments in Heavy Fermion (HF) compounds leads to unexpected new physics. In several HF materials, in particular the Uranium based ones, new forms of superconductivity is reported. Yet little is known about the superconducting (SC) state due to experimental restrictions of common techniques.
The project targets on mapping out the superconducting gap topology of several interesting Uranium-based HF compounds by means of magnetic field-angle resolved specific heat and thermal conductivity experiments at low temperatures and under hydrostatic pressure. These new techniques make use of the Volovik effect, and allow experiments under multiple extreme conditions (low temperatures, high magnetic fields and hydrostatic pressures). The results reveal exact knowledge about the superconducting gap which elucidates the fundamental properties of the superconducting state. In the course of this work experiments on single crystals of UPt3, UPd2Al3, UBe13, UCoGe, URhGe, UIr, and UGe2 are planned. It is envisaged that samples are grown and characterized within the project. Measurements will be conducted in a dilution refrigerator as millikelvin temperatures are necessary, and rotation of the single crystals with respect to the magnetic field direction is done by piezo-rotator. For the latter two compounds applying hydrostatic pressure is necessary to enter the SC state. For this, miniature pressure cells will be designed which will withstand pressures up to 3GPa. |
| References |
| H. v. Löhneysen et al., Rev. Mod. Phys. 79, 1015 (2007)
M. Sigrist: Introduction to Unconventional Superconductivity (Switzerland) P. Thalmeier, G. Zwicknagl: Unconventional superconductivity and magnetism in lanthanide and actinide intermetallic compounds, Handb. Phys. Chem. Rare Earths 34, 135 (2005) |