Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons - Poster Session
TT 20.8: Poster
Mittwoch, 28. März 2007, 14:00–17:45, Poster A
High pressure resistivity studies on YbIr2Si2 — •Monica Macovei1, Michael Nicklas1, Cornelius Krellner1, Zakir Hossain2, Christoph Geibel1, and Frank Steglich1 — 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01069 Dresden, Germany — 2Departament of Physics, Indian Institute of Technology, Kampur 208016, India
We investigated the high pressure phase diagram on high-quality single crystals of YbIr2Si2. Electrical resistivity,ρ, was measured in the pressure range up to 10 GPa and for temperature 0.05 K < T < 300 K. Ambient pressure specific heat and resistivity studies confirmed a Fermi liquid ground state below ∼ 200 mK [1]. The Fermi liquid ground state is persisting at low pressure p < 2 GPa. However, with further increasing pressure the low-temperature dependence of the resisitivity changes from a T2 dependence to ρ= ρ0+ ATn with n<2, indicating non-Fermi liquid behavior. By applying a magnetic field the Fermi liquid ground state is stabilized again. For p >7 GPa magnetic order is developing marked by a kink in resistivity similar like in other Yb based heavy fermion compounds, e.g. YbRh2Si2, YbCu2Si2 and YbNi2Ge2.
[1] Z.Hossain et al. Phys. Rev. B 72, 094411 (2005).