Unusual oscillation in tunneling magnetoresistance near a quantum critical point in Sr₃Ru₂O₇

The experimental data obtained from single-electron tunneling measurements on Sr₃Ru₂O₇, were reported. Tunneling measurements were carried out in a ³He cryostat using a standard four-probe technique. An unusual oscillation in tunneling magnetoresistance and a sharp change of the Fermi surface in tunneling spectra were observed near the metamagnetic transition in Sr₃Ru₂O₇. The results show that single-electron tunneling might prove to be very effective means of studying quantum critical phenomena.