Universal correlation between H-linear magnetoresistance and T-linear resistivity in high-temperature superconductors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39333487.
- Also identified by DOI 10.1038/s41467-024-52564-3 and PMC identifier 11436940.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The signature feature of the 'strange metal' state of high-T<sub>c</sub> cuprates-its linear-in-temperature resistivity-has a coefficient α<sub>1</sub> that correlates with T<sub>c</sub>, as expected were α<sub>1</sub> derived from scattering off the same bosonic fluctuations that mediate pairing. Recently, an anomalous linear-in-field magnetoresistance (=γ<sub>1</sub>H) has also been observed, but only over a narrow doping range, leaving its relation to the strange metal state and to the superconductivity unclear. Here, we report in-plane magnetoresistance measurements on three hole-doped cuprate families spanning a wide range of temperatures, magnetic field strengths and doping. In contrast to expectations from Boltzmann transport theory, γ<sub>1</sub> is found to correlate universally with α<sub>1</sub>. A phenomenological model incorporating real-space inhomogeneity is proposed to explain this correlation. Within this picture, superconductivity in hole-doped cuprates is governed not by the strength of quasiparticle interactions with a bosonic bath, but by the concentration of strange metallic carriers.