Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.12: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Hydrostatic-pressure tuning of the magnetic states in the frustrated itinerant system YFe4Si2 — •C. Thurn1, B. Wolf1, C. Krellner1, N. Mufti2, C. Geibel2, and M. Lang1 — 1Physikalisches Institut, Goethe Uni, Frankfurt/M., SFB/TR49, Germany — 2MPI CPfS, Dresden, Germany
Magnetic frustration can enhance quantum fluctuations which are supposed to be the key in creating exotic states. Whereas frustration is often found in insulators, frustrated magnetic metals are rare. The family of intermetallic AFe4X2 with A=Y, Lu, Zr and X=Ge, Si represents such frustrated itinerant systems in which the Fe ions are arranged on slightly distorted, edge-linked tetrahedra which promote the frustration. The properties of these compounds cover a wide range, including frustrated antiferromagnetic order and potentially paramagnetic states close to quantum-critical points. The substitution on the A and X sites here modifies the unit-cell parameters, suggesting a significant influence of chemical pressure on the ground-state properties. In order to mimic and fine-tune the effect of chemical pressure, we present a study of the magnetic properties of YFe4Si2 under hydrostatic pressures up to 4 kbar. This compound shows two consecutive magnetic phase transitions at ambient pressure which are strongly coupled to structural degrees of freedom. Our results indicate moderate pressure dependences of the two phase transitions. In order to investigate the interplay of the structure with magnetic frustration in more detail, we also discuss pressure tuning of the distinctly more frustrated system ZrFe4Si2 which might be located close to a quantum-critical point.