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We have studied the magnetotransport properties of the metallic, p-typeSb2Te2Se which is a topological insulator. Magnetoresistance shows Shubnikov deHaas oscillations in fields above B=15 T. The maxima/minima positions ofoscillations measured at different tilt angles with respect to the B directionalign with the normal component of field Bcosine, implying the existence of a2D Fermi surface in Sb2Te2Se. The value of the Berry phase determined from aLandau level fan diagram is very close to 0.5, further suggesting that theoscillations result from topological surface states. From Lifshitz-Kosevichanalyses, the position of the Fermi level is found to be EF =250 meV, above theDirac point. This value of EF is almost 3 times as large as that in ourprevious study on the Bi2Se2:1Te0:9 topological insulator; however, it stilltouches the tip of the bulk valence band. This explains the metallic behaviorand hole-like bulk charge carriers in the Sb2Te2Se compound.

Quantum oscillations in metallic Sb2Te2Se topological insulator