Heterostructures*

A variety of interesting physical phenomenon have been found to live at the interface between complex oxide layers. Significant work has been done to characterize the electrical transport properties of the two dimensional conducting gases present in systems like LaAlO₃ (LAO)/ SrTiO₃ (STO). Recently, (La_0.3Sr_0.7)(Al_0.65Ta_0.35)O₃ (LSAT) /STO has been investigated due to improved lattice matching when compared to LAO/STO, and interesting effects due to strong spin orbit interactions^1,2. Here we report an anomalous transverse resistance observed in Hall bars at the interface of (111) oriented LSAT/STO. This effect does not track with low field Hall coefficient, nor longitudinal resistance over temperatures from 4 K to 70 K. We discuss these findings in the context of similar effects seen in La_2-xSr_xCuO₄ (LSCO)/STO and LAO/STO systems^3,4.

[1] Bal et al., Phys Rev B. 98, 085416 (2018)
[2] Bal et al., Phys Rev B. 99, 035408 (2019)
[3] Wu et al., J. of Supercon Novel Magn. 32:1623-1628 (2019)
[4] Davis et al., Phys Rev B. 98, 024504 (2018)