Field-tuned Fermi liquid in quantum critical YFe2Al10

We present measurements of the magnetization M, ac susceptibility chi', electrical resistivity., and specific heat C in single crystals of metallic YFe2Al10. The magnetic susceptibility follows a Curie-Weiss temperature dependence for 75 K <= T <= 750 K, with a fluctuating Fe moment of 0.45 mu(B)/Fe, and the ac susceptibility chi' diverges at lower temperatures chi' similar to T-1.28 +/- 0.04 when the ac field is in the basal plane. The field B and temperature T dependencies of the magnetization M are well described by the scaling expression MT-beta = F(B/T beta+gamma) for 1.8 K <= T <= 30 K and for fields larger than 0.1T. These results indicate that strong quasi-two-dimensional critical fluctuations are present that can be suppressed by magnetic fields. The magnetic and electronic parts of the specific heat C-M show a similar divergence for 0.4 K <= T <= 12 K, where C-M/T similar to T-0.47 +/- 0.03. The divergences in chi' and C-M/T indicate that YFe2Al10 is located near a quantum critical point, and no magnetic order is observed above 0.09 K. We argue that our results are inconsistent with quantum impurity or disorder models, suggesting instead that YFe2Al10 is on the verge of bulk magnetic ordering, and that the critical fluctuations that are associated with this quantum critical point lead to the divergencies in C-M/T and chi'.