Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.24: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Pressure and field tuning in CeAgSb2 and NbFe2 — •Peter Logg1, Zhuo Feng1,2, Takao Ebihara3, William J Duncan4, Andreas Neubauer5, Christian Pfleiderer5, Hong’En Tan1, Sven Friedemann1, Patricia Alireza1, Swee Goh1, and F Malte Grosche1 — 1Cavendish Laboratory, University of Cambridge, Cambridge, UK — 2London Centre for Nanotechnology, UCL, London, UK — 3Dept. of Physics, Shizuoka University, Shizuoka, Japan — 4Dept. of Physics, Royal Holloway, University of London, Egham, UK — 5Physik Department E21, Technische Universitat Munchen, Garching, Germany
The intermetallic CeAgSb2 and the dilution series Nb1−yFe2+y both exhibit uniaxial magnetic order which is sensitive to both hydrostatic pressure and transverse magnetic fields. CeAgSb2 is a Kondo-lattice compound which at ambient pressure undergoes a ferromagnetic (FM) transition at TC = 9.6 K. FM is suppressed via the application of either hydrostatic pressure or an in-plane tuning field, and extrapolates to zero temperature by pressures exceeding 35 kbar or fields greater than 2.8 T. Contrastingly, slightly iron-rich Nb1−yFe2+y (y = 0.015) undergoes a spin-density wave transition at TN = 31 K, before becoming FM at TC = 23 K. The application of pressure rapidly suppresses both phases, driving the system towards the quantum critical point which may be reached via compositional tuning at around y = -0.015.
We investigate the HT and PT phase diagrams of both compounds, through a series of high-pressure and field tuned AC and DC susceptibility measurements.