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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.22: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Spin density wave quantum phase transition in the LuFe₂Ge₂/YFe₂Ge₂ system — •Zhuo Feng and Malte Grosche — Quantum Matter Group, Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, U.K.

In intermetallic transition metal compounds, spin density wave order and studies of the associated quantum critical point are still comparatively rare. LuFe₂Ge₂ has been reported to exhibit spin density wave order below 9K, and its isoelectronic sister compound YFe₂Ge₂ is paramagnetic. Together, they form an attractive system for probing spin density wave quantum criticality. We have grown high quality crystals of YFe₂Ge₂ and LuFe₂Ge₂ using flux as well as radio frequency induction methods. YFe₂Ge₂ exhibits an unusually high Sommerfeld coefficient of the specific heat capacity C/T at 1 K in excess of 100 mJ/(mol K²) and still rising significantly with decreasing temperature, as well as an anomalous temperature dependence of the electrical resistivity, ρ ∼ T^3/2. High-pressure measurements are under way in LuFe₂Ge₂, to investigate its magnetic phase diagram near the magnetic quantum phase transition, and to examine the associated quantum critical behaviour.