Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"Heavy Fermions"”.
-
Magnetism in strongly correlated electron systems
… systems, the high-T$\sb{c}$ materials and heavy fermions.
-
Searching for novel objects in the electroweak theory
… temporally periodic configurations. We consider heavy fermion quantum fluctuations about static Higgs-Gauge configurations, and argue for the existence of stable fermionic solitons. These could resolve the fermion decoupling puzzle in chiral gauge theories. We describe our search for a fermionic …
-
Elementary excitations in heavy-fermion superconductors
… is presented of the elementary excitations in heavy-fermion superconductors, under the hypothesis that the Cooper pairs are in a relative p-wave or d-wave. First, all p-wave and d-wave states are classified in the presence of strong spin-orbit coupling and crystal fields, which are important …
-
Ponto crítico quântico supercondutor em sistemas multi-bandas
… by experiments on the cuprate superconductors, heavy fermions' materials, organic conductors and related compounds. Nevertheless, the transitions involving superconducting phases are not as well explored theoretically as transitions involving magnetic phases. Thus, the study of superconduct- ing …
-
Competition and unification of Kondo coherence and magnetic ordering
The heavy fermion quantum critical point is one of the most puzzling problems in the field of highly correlated electrons. This is a quantum critical point separating a non-magnetic heavy fermi liquid metal from an antiferromagnetically ordered metal. The major problem facing us is the fact that, …
-
Untersuchung der magnetischen Eigenschaften von CeCu2(Si1-xGex)2 mittels Neutronenstreuung
1979 wurde mit CeCu2Si2 erstmalig ein Schwere-Fermionen-Supraleiter entdeckt. Diese Verbindung, entdeckt von Steglich und Mitarbeitern, befindet sich nahe an einem quantenkritischen Punkt, an dem die magnetische Ordnung gerade unterdrückt wird. Der Abstand zu diesem Punkt kann sowohl durch Druck …
-
Wechselspiel von Magnetismus und Supraleitung im Schwere-Fermionen-System CeCu2Si2
Das Auftreten von Supraleitung in Systemen mit schweren Fermionen, erstmals entdeckt in CeCu_2Si_2, wird mit der Nähe zu einem quantenkritischen Punkt in Verbindung gebracht. Daraus ergibt sich ein komplexes Zusammenspiel von Magnetismus und Supraleitung, das in der vorliegenden Arbeit durch …
-
Electrical resistivity of YbRh2Si2 and EuT2Ge2 (T = Co, Cu) at extreme conditions of pressure and temperature
This investigation address the effect that pressure, p, and temperature, T, have on 4f-states of the rare-earth elements in the isostructural YbRh2Si2, EuCo2Ge2, and EuCu2Ge2 compounds. Upon applying pressure, the volume of the unit cell reduces, enforcing either the enhancement of the …