Strange metal transport and violation of the conjectured Planckian scattering rate limit in electron-doped cuprates*

I will discuss recent transport studies of the electron-doped cuprate system La2-xCexCuO4 that exhibits strange metal transport in the normal state down to 35 mK. The strange metal behavior is manifested as a linear-in-T resistivity from 35 mK to 20K and a ~T^2 resistivity from 50K to 400K over a range of doping above and below a Fermi surface reconstruction at x = 0.14 [1-2]. Other strange metal behavior includes an anomalous low temperature linear-in-H magnetoresistance and lnT thermopower [3-5]. I also show that the magnitude of the ~T^2 resistivity far exceeds the conjectured Planckian bound on inelastic scattering [6].

1. T. Sarkar et al., Phys. Rev. B 103, 224501 (2021)

2. T. Sarkar et al., Phys. Rev. B 98, 224503 (2018)

3. R. L. Greene et al., Ann Rev Cond. Matt. Phys. 11, 213 (2020)

4. T. Sarkar et al., Sci. Adv. 5, eeav6753 (2019)

5. P. R. Mandal et. al., PNAS 116, 5991 (2019)

6. N. P. Poniatowski et al., arXiv:2109.00513 (2021)