The ground-state properties of new (RE, U) nTIn3n+2 intermetallic compounds
| Název práce v češtině: | Studium základního stavu nových intermetalických sloučenin (RE, U) nTIn3n+2 |
|---|---|
| Název v anglickém jazyce: | The ground-state properties of new (RE, U) nTIn3n+2 intermetallic compounds |
| Klíčová slova: | intermetalické sloučeniny na bázi vzácných zemin a uranu, příprava monokrystalů, supravodivost a magnetismus |
| Klíčová slova anglicky: | Rare-earth and Uranium Intermetallic Compounds, Single crystal growth, Superconductivity and Magnetism |
| Akademický rok vypsání: | 2011/2012 |
| Typ práce: | disertační práce |
| Jazyk práce: | angličtina |
| Ústav: | Katedra fyziky kondenzovaných látek (32-KFKL) |
| Vedoucí / školitel: | Dr. rer. nat. Jeroen Custers |
| Řešitel: | skrytý - zadáno a potvrzeno stud. odd. |
| Datum přihlášení: | 26.09.2011 |
| Datum zadání: | 26.09.2011 |
| Datum potvrzení stud. oddělením: | 29.12.2011 |
| Datum a čas obhajoby: | 07.09.2015 09:00 |
| Datum odevzdání elektronické podoby: | 20.07.2015 |
| Datum odevzdání tištěné podoby: | 20.07.2015 |
| Datum proběhlé obhajoby: | 07.09.2015 |
| Oponenti: | prof. Mohsen Abd-Elmeguid |
| Frank Roelof De Boer | |
| Konzultanti: | prof. RNDr. Vladimír Sechovský, DrSc. |
| doc. RNDr. Jan Prokleška, Ph.D. | |
| Zásady pro vypracování |
| 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. |
| Seznam odborné literatury |
| 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) |