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Abstract:
In the heavy-fermion antiferromagnet YbRh2Si2YbRh2Si2 pronounced non-Fermi-liquid behaviour is known to be related to the system being close to an antiferromagnetic quantum critical point (QCP). Using the magnetic field as a control parameter, YbRh2Si2YbRh2Si2 may continuously be driven through a (field-induced) QCP. The evolution of the Fermi sea volume with field is of great interest since it may discriminate between different QCP scenarios. If Hall measurements are used to probe the Fermi sea volume, the anomalous Hall effect has to be separated from the normal one. In this contribution it is shown how this can be achieved for the initial Hall coefficient in YbRh2Si2YbRh2Si2.
