Thermal Expansion of the Heavy Fermion Antiferromagnet YbAgGe

We measured the thermal expansion of YbAgGe. YbAgGe is a heavy fermion with two antiferromagnetic phase transitions and a possible magnetic field induced quantum critical point. We measured the linear thermal expansion along the a-axis as well as along the c-axis of the substance. We combined the measurements to calculate the volume thermal expansion. Our calculations and measurements show regions of both positive and negative thermal expansion. We will present and discuss these results