We report a metamagnetic critical point at (B*,T*)=(5.1T,1.1K) for magnetic fields applied perpendicular to the (tetragonal) c-axis of Sr3Ru2O7. First-order behaviour well below T* indicates that (B*,T*) marks a critical end-point that terminates a line of first-order metamagnetic transitions. The absence of first-order behaviour in the metamagnetic transition with B||c confirms that the non-Fermi liquid behaviour for B||c is underpinned by a metamagnetic quantum critical end-point for which T*->0. Scaling behaviour of the resistivity under hydrostatic pressure yields the surprising result that although B* increases rapidly with pressure, T* has only a weak pressure dependence.
@article{arxiv.cond-mat/0207697,
title = {Critical end-point and metamagnetic quantum criticality in Sr3Ru2O7},
author = {May Chiao and C. Pfleiderer and R. Daou and A. McCollam and S. R. Julian and G. G. Lonzarich and R. S. Perry and A. P. Mackenzie and Y. Maeno},
journal= {arXiv preprint arXiv:cond-mat/0207697},
year = {2007}
}