Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.23: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Quantum critical field and pressure tuning in the heavy fermion ferromagnet CeAgSb₂ — •Peter Logg¹, Zhou Feng¹, Takao Ebihara², Patricia Alireza¹, Swee Goh¹, and F. Malte Grosche¹ — ¹Cavendish Laboratory, University of Cambridge, UK — ²Department of Physics, Shizuoka University, Shizuoka 422-8529, Japan

Quantum critical phenomena have over the past decade been investigated primarily in ferromagnetic or nearly ferromagnetic d-electron systems and in antiferromagnetic f-electron systems. Here, we present a series of measurements of the ferromagnetic cerium compound CeAgSb₂. CeAgSb₂ is a Kondo-lattice compound which at ambient pressure undergoes a ferromagnetic transition at T_c=9.6 K. Ferromagnetism is rapidly suppressed by applied hydrostatic pressure, and at pressures > 3.5 GPa it is replaced by an unidentified ordered phase, presumably antiferromagnetism. Alternatively, the ferromagnetic phase may be suppressed to 0K by the application of a magnetic tuning field, which is applied perpendicular to the easy-axis of magnetisation.

We investigate both the P-T and H-T phase diagrams of this compound through a series of ac-susceptibility, resistivity and high-pressure magnetisation measurements.