Magnetotransport in <i>H</i> || <i>c</i> of La<sub>1.875</sub>Ba<sub>0.125</sub>CuO<sub>4</sub> near the charge order (CO) transition
ORAL
Abstract
The nature of the dynamics of charge-ordered states in underdoped cuprates has been of great recent interest. Our work on La2-xBaxCuO4 with x=0.125 (LBCO) in zero magnetic field (H) reveals the presence of dynamic behavior within the charge-ordered state in the form of avalanches, similar to that in La1.48Nd0.4Sr0.12CuO4 (LNSCO). In LNSCO, avalanches were also observed to be asymmetrically driven by H around the concurrent CO and structural transition with an additional onset of negative magnetoresistance (MR), which was attributed to the emergence of CO [1]. In La1.7Eu0.2Sr0.12CuO4 (LESCO) negative MR, albeit with no avalanches, was observed at the onset of CO but not at the higher temperatures around the structural transition [1]. The presence of avalanches and overlap of the CO and structural transitions in LBCO present the opportunity to clarify the role of the LNSCO Nd3+ moments and the origin of the negative MR. Therefore, we report the H = 0 findings and the study of H || c magnetoresistance of LBCO near the CO transition.
[1] P. G. Baity et al., Phys. Rev. Lett. 120, 156602 (2018).
[1] P. G. Baity et al., Phys. Rev. Lett. 120, 156602 (2018).
*Supported by NSF DMR-1707785 and NHMFL via NSF DMR-1644779 and the State of Florida. Work at BNL supported by Office of Basic Energy Sciences, US DOE, under Contract No. DE-SC0012704.
–
Presenters
-
Lily Stanley
- Department of Physics and National High Magnetic Field Lab, Florida State University
- Dept. of Phys. Natl. High Magnetic Field Lab.