Effect of chemical substitution and pressure on YbRh2Si2

Details Effect of chemical substitution and pressure on YbRh2Si2 Effect of chemical substitution and pressure on YbRh2Si2

2010-03-10

arxiv.org/abs/1003.2143v1

Phys. Status Solidi B 247, 727 (2010).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, proceedings paper of the QCNP09

Scientific paper

10.1002/pssb.200983064

We carried out electrical resistivity experiments on (Yb,La)Rh2Si2 and on Yb(Rh,Ir)2Si2 under pressure and in magnetic fields. YbRh2Si2 exhibits a weak antiferromagnetic transition at atmospheric pressure with a N\'eel temperature of only T_N = 70 mK. By applying a small magnetic field T_N can be continuously suppressed to T=0 at B_c = 60 mT (B_|_c) driving the system to a quantum critical point (QCP). On applying external pressure the magnetic phase is stabilized and T_N(p) is increasing as usually observed in Yb-based heavy-fermion metals. Substituting Yb by La or Rh by Ir allows to create a negative chemical pressure, La (Ir) being smaller than Yb (Rh), and eventually to drive YbRh2Si2 to a pressure controlled QCP. In this paper we compare the effect of external hydrostatic pressure and chemical substitution on the ground-state properties of YbRh2Si2.

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