We developed novel techniques to fabricate atomically thin Bi 2.1 Sr 1.9 CaCu 2.0 O 8 + δ van der Waals heterostructures down to two unit cells while maintaining a transition temperature T c close to the bulk, and carry out magnetotransport measurements on these van der Waals devices. We find a double sign change of the Hall resistance R x y as in the bulk system, spanning both below and above T c . Further, we observe a drastic enlargement of the region of sign reversal in the temperature-magnetic field phase diagram with decreasing thickness of the device. We obtain quantitative agreement between experimental R x y ( T , B ) and the predictions of the vortex dynamics-based description of Hall effect in high-temperature superconductors both above and below Tc.
Sign-Reversing Hall Effect in Atomically Thin High-Temperature Bi2.1Sr1.9CaCu2.0O8+δ Superconductors / Frank Zhao, S. Y.; Poccia, N; Margaret G., Panetta; Cyndia, Yu; Jedediah W., Johnson; Hyobin, Yoo; Ruidan, Zhong; G. D., Gu; Kenji, Watanabe; Takashi, Taniguchi; Svetlana V., Postolova; Valerii M., Vinokur; and Philip, Kim. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - (2019). [https://doi.org/10.1103/PhysRevLett.122.247001]
Sign-Reversing Hall Effect in Atomically Thin High-Temperature Bi2.1Sr1.9CaCu2.0O8+δ Superconductors
Poccia N;
2019
Abstract
We developed novel techniques to fabricate atomically thin Bi 2.1 Sr 1.9 CaCu 2.0 O 8 + δ van der Waals heterostructures down to two unit cells while maintaining a transition temperature T c close to the bulk, and carry out magnetotransport measurements on these van der Waals devices. We find a double sign change of the Hall resistance R x y as in the bulk system, spanning both below and above T c . Further, we observe a drastic enlargement of the region of sign reversal in the temperature-magnetic field phase diagram with decreasing thickness of the device. We obtain quantitative agreement between experimental R x y ( T , B ) and the predictions of the vortex dynamics-based description of Hall effect in high-temperature superconductors both above and below Tc.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
