Correlation between scale-invariant normal state resistivity and superconductivity in an electron-doped cuprate
| Autor: | Sarkar, Tarapada, Mandal, P. R., Poniatowski, N. R., Chan, M. K., Greene, Richard L. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Science Advances 5, eaav6753 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1126/sciadv.aav6753 |
| Popis: | An understanding of the normal state in the high-temperature superconducting cuprates is crucial to the ultimate understanding of the long-standing problem of the origin of the superconductivity itself. This so-called strange metal state is thought to be associated with a quantum critical point (QCP) hidden beneath the superconductivity(1,2). In electron-doped cuprates in contrast to hole-doped cuprates it is possible to access the normal state at very low temperatures and low magnetic fields to study this putative QCP and to probe the T~0 K state of these materials(3,4). We report measurements of the low temperature normal state magnetoresistance (MR) of the n-type cuprate system La2-xCexCuO4 (LCCO) and find that it is characterized by a linear-in-field behavior, which follows a scaling relation with applied field and temperature, for doping (x) above the putative QCP (x= 0.14)(5). This unconventional behavior suggests that magnetic fields probe the same physics that gives rise to the anomalous low-temperature linear-in-T resistivity(4). The magnitude of the linear MR decreases as Tc decreases and goes to zero at the end of the superconducting dome (x ~0.175) above which a conventional quadratic MR is found. These results show that there is a strong correlation between the quantum critical excitations of the strange metal state and the high-Tc superconductivity. Comment: 21 pages, 13 figures, comments are welcome |
| Databáze: | arXiv |
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