Spin-polarized transport through the Kondo-lattice 2-D vdW ferromagnets FenGeTe2

DEEPTI RANA; Monika Bhakar; Soumyaranjan Dash; Aswini R; Basavaraja G; Chandan Patra; Satyabrata Bera; Sandeep Howlader; Neeraj Saini; Suman K Pradhan; Rajeswari R Chowdhury; Mintu Mondal; Ravi P Singh; Mukul Kabir; Sanjeev Kumar; Goutam Sheet

Spin-polarized transport through the Kondo-lattice 2-D vdW ferromagnets Fe<sub>n</sub>GeTe<sub>2</sub>

ORAL

Abstract

The emerging generation of 2D vdW ferromagnets, specifically the compounds denoted as Fe_nGeTe₂(with n=3, 4), holds great promise for realizing low-power spintronics. These ferromagnetic materials exhibit ferromagnetic behavior at nearly room temperature, possess excellent electrical conductivity, and can be seamlessly integrated with other materials due to their layered structure. This makes them highly relevant for efficient applications in the field of spintronics. Through point contact spectroscopy (PCS) and scanning tunneling microscopy/spectroscopy experiments (STM/S), we have provided evidence of the simultaneous existence of a highly spin-polarized Fermi surface and Kondo lattice behavior in these ferromagnets. Our PCS findings, involving mesoscopic junctions between these itinerant ferromagnets and conventional superconductors, demonstrate the ability of both ferromagnets to generate highly spin-polarized transport current. Spectroscopic measurements have revealed the presence of a hybridization gap, indicating the existence of heavy Fermionic characteristics in these systems. Due to the unique coexistence of itinerant ferromagnetism and heavy Fermionic behavior, the Fe_nGeTe₂ family possesses the potential to give rise to novel quantum phenomena when their physical properties are allowed to interact with other quantum orders through material heterostructuring.

^*INSPIRE awarded by the Department of Science and Technology, Government of India

March 7, 2024, 10:36 AM – March 7, 2024, 10:48 AM

Publication: [1] D. Rana, R. Aswini, G. Basavaraja, C. Patra, S. Howlader, R. R. Chowdhury, M. Kabir, R.P. Singh, and G. Sheet, Physical Review B 106, 085120 (2022).
[2] D. Rana, M. Bhakar, G. Basavaraja, S. Bera, N. Saini, S. K. Pradhan, M. Mondal, M. Kabir and G. Sheet Physical Review B 107, 085120 (2022).
[3] D. Rana, S. Dash, M. Bhakar, R. R. Chowdhury, R. P. Singh, S. Kumar, and G. Sheet arXiv:2310.06521 (To appear in Physical Review B)

Presenters

DEEPTI RANA
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India

Authors

DEEPTI RANA
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India
Monika Bhakar
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India
Soumyaranjan Dash
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India
Aswini R
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India
Basavaraja G
- Department of Physics, Indian Institute of Science Education and Research (IISER) Pune, PO 411008, India
Chandan Patra
- Department of Physics, Indian Institute of Science Education and Research (IISER) Bhopal, PO 462066, India
Satyabrata Bera
- School of Physical Sciences, Indian Association for the Cultivation Of Science, Jadavpur, Kolkata PO 700032
Sandeep Howlader
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India
Neeraj Saini
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India
Suman K Pradhan
- School of Physical Sciences, Indian Association for the Cultivation Of Science, Jadavpur, Kolkata PO 700032
Rajeswari R Chowdhury
- Department of Physics, Indian Institute of Science Education and Research (IISER) Bhopal, PO 462066, India
Mintu Mondal
- School of Physical Sciences, Indian Association for the Cultivation Of Science, Jadavpur, Kolkata PO 700032
Ravi P Singh
- Indian Institute of Science Education and Research Bhopal
- Department of Physics, Indian Institute of Science Education and Research (IISER) Bhopal, PO 462066, India
Mukul Kabir
- Department of Physics, Indian Institute of Science Education and Research (IISER) Pune, PO 411008, India
Sanjeev Kumar
- Indian Institute of Science Education and Research, Mohali
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India
- Indian Institute of Science Education and Research (IISER) Mohali
Goutam Sheet
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 8 1, S.A. S. Nagar, Manauli, PO 140306, India