Carrier density independent scattering rate in SrTiO₃-based electron liquids

Mikheev, Evgeny; Raghavan, Santosh; Zhang, Jack Y.; Marshall, Patrick B.; Kajdos, Adam P.; Balents, Leon; Stemmer, Susanne

doi:10.1038/srep20865

Title: Carrier density independent scattering rate in SrTiO₃-based electron liquids

Journal Article · Wed Feb 10 00:00:00 EST 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep20865· OSTI ID:1242355

Mikheev, Evgeny ^[1]; Raghavan, Santosh ^[1]; Zhang, Jack Y. ^[1]; Marshall, Patrick B. ^[1]; Kajdos, Adam P. ^[1]; Balents, Leon ^[2]; Stemmer, Susanne ^[1]

Univ. of California, Santa Barbara, CA (United States). Dept. of Materials
Univ. of California, Santa Barbara, CA (United States). Kavli Institute for Theoretical Physics

We examine the carrier density dependence of the scattering rate in two- and three-dimensional electron liquids in SrTiO₃ in the regime where it scales with Tⁿ (T is the temperature and n ≤ 2) in the cases when it is varied by electrostatic control and chemical doping, respectively. It is shown that the scattering rate is independent of the carrier density. This is contrary to the expectations from Landau Fermi liquid theory, where the scattering rate scales inversely with the Fermi energy (E_F). We discuss that the behavior is very similar to systems traditionally identified as non-Fermi liquids (n < 2). This includes the cuprates and other transition metal oxide perovskites, where strikingly similar density independent scattering rates have been observed. Ultimately, the results indicate that the applicability of Fermi liquid theory should be questioned for a much broader range of correlated materials and point to the need for a unified theory.

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Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-02ER45994

OSTI ID:: 1242355

Journal Information:: Scientific Reports, Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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