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Zhao SYF, Poccia N, Panetta MG, Yu C, Johnson JW, Yoo H, Zhong R, Gu GD, Watanabe K, Taniguchi T, Postolova SV, Vinokur VM, Kim P. Sign-Reversing Hall Effect in Atomically Thin High-Temperature Bi_{2.1}Sr_{1.9}CaCu_{2.0}O_{8+δ} Superconductors. PHYSICAL REVIEW LETTERS 2019; 122:247001. [PMID: 31322397 DOI: 10.1103/physrevlett.122.247001] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 01/31/2019] [Indexed: 06/10/2023]
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_{xy} 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_{xy}(T,B) and the predictions of the vortex dynamics-based description of Hall effect in high-temperature superconductors both above and below T_{c}.
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Affiliation(s)
- S Y Frank Zhao
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Nicola Poccia
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Margaret G Panetta
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Cyndia Yu
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Jedediah W Johnson
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Hyobin Yoo
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Ruidan Zhong
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - G D Gu
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Kenji Watanabe
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
| | - Takashi Taniguchi
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
| | - Svetlana V Postolova
- Institute for Physics of Microstructures RAS, Nizhny Novgorod 603950, Russia
- Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk 630090, Russia
| | - Valerii M Vinokur
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Consortium for Advanced Science and Engineering, Office of Research and National Laboratories, University of Chicago, Chicago, Illinois 60637, USA
| | - Philip Kim
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
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