Article
Nanoscience & Nanotechnology
Kun-Rok Jeon, Binoy Krishna Hazra, Jae-Keun Kim, Jae-Chun Jeon, Hyeon Han, Holger L. Meyerheim, Takis Kontos, Audrey Cottet, Stuart S. P. Parkin
Summary: This study reports the spin-triplet supercurrent spin valves in chiral antiferromagnetic Josephson junctions and a direct-current superconducting quantum interference device. By utilizing the Berry curvature-induced fictitious magnetic fields and the non-collinear atomic-scale spin arrangement, long-range triplet Cooper pairing is achieved in the chiral antiferromagnet Mn3Ge. The observed supercurrent spin-valve behaviors under a small magnetic field and the direct-current superconducting quantum interference device functionality are theoretically verified.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Lucia Vigliotti, Fabio Cavaliere, Giacomo Passetti, Maura Sassetti, Niccolo Traverso Ziani
Summary: This study investigates a Josephson junction with coupled reconstructed topological channels, and finds a robust f(0) Josephson effect without the presence of external magnetic fields. The anomalous current increases as a function of temperature. These results have significant implications for the technological applications of superconductors and nanostructures.
Article
Materials Science, Multidisciplinary
Michael Barth, Jacob Fuchs, Denis Kochan
Summary: This study investigates the interplay between spectral and transport properties in bilayer graphene and s-wave superconductors using Green's function analytical methods and numerical simulations. The results reveal unique superconducting signatures that differentiate between resonant and off-resonant regimes, providing important insights into the behavior of bilayer graphene and other functionalized superconductors.
Article
Chemistry, Multidisciplinary
Kaifei Kang, Helmuth Berger, Kenji Watanabe, Takashi Taniguchi, Laszlo Forro, Jie Shan, Kin Fai Mak
Summary: Researchers have observed a thickness-driven 0-pi transition in Josephson junctions made of NbSe2 and Cr2Ge2Te6, and have also observed unusual supercurrent interference patterns near the critical thickness, indicating the formation of nanoscale domains in Cr2Ge2Te6.
Article
Physics, Applied
Remko Fermin, Junxiang Yao, Kaveh Lahabi, Jan Aarts
Summary: Research on the generation of s-wave spin-triplet Cooper pairs in ferromagnetic metals has been ongoing for over a decade, with important aspects of the phenomenon well understood. The key to converting s-wave singlet pairs in a superconductor to s-wave triplets in a ferromagnet lies in engineering well-defined magnetic inhomogeneity at the superconductor interface, using vertical layer stacks or magnetic textures as triplet generators. This paper presents experimental findings on lateral disk-shaped Josephson junctions, emphasizing the different generator mechanisms and the observation of strong supercurrents confined to the rims, which are attributed to the triplet nature but remain a mystery.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Taras Golod, Razmik A. Hovhannisyan, Olena M. Kapran, Vyacheslav V. Dremov, Vasily S. Stolyarov, Vladimir M. Krasnov
Summary: This work presents prototypes of a phase shifter utilizing Josephson phase shift generated by coreless superconducting vortices. The small size of the vortex enables broad-range tunability through nanoscale manipulation in a micron-size array of vortex traps. The phase shift in the device can be reconfigured between quantized states in a broad [-3 pi +3 pi] range with just a few vortex traps.
Article
Materials Science, Multidisciplinary
Qiang Cheng, Qing Yan, Qing-Feng Sun
Summary: Our study reveals that the Josephson effect in spin-triplet superconductor-quantum anomalous Hall insulator-spin-triplet superconductor junctions strongly depends on the orientations of the d vectors in superconductors, showing different effects for different configurations.
Article
Materials Science, Multidisciplinary
Oleksii Maistrenko, Benedikt Scharf, Dirk Manske, Ewelina M. Hankiewicz
Summary: The study reveals that uniform magnetization in three-dimensional topological insulator Josephson junctions can induce asymmetry in the Andreev spectrum, leading to Majorana modes and the Josephson Hall effect. Magnetic control and gating can enable significant Josephson Hall currents compared to longitudinal currents.
Article
Materials Science, Multidisciplinary
Yuri Fukaya, Yukio Tanaka, Paola Gentile, Keiji Yada, Mario Cuoco
Summary: We study the non-trivial properties of non-centrosymmetric superconductors with spin-triplet pairing, and investigate the effects of spin-orbit coupling on the Josephson behavior. The results demonstrate the potential for designing superconducting orbitronics devices and explain anomalies in oxide interface superconductors.
NPJ QUANTUM MATERIALS
(2022)
Article
Chemistry, Physical
D. Sanchez-Manzano, S. Mesoraca, F. A. Cuellar, M. Cabero, V. Rouco, G. Orfila, X. Palermo, A. Balan, L. Marcano, A. Sander, M. Rocci, J. Garcia-Barriocanal, F. Gallego, J. Tornos, A. Rivera, F. Mompean, M. Garcia-Hernandez, J. M. Gonzalez-Calbet, C. Leon, S. Valencia, C. Feuillet-Palma, N. Bergeal, A. I. Buzdin, J. Lesueur, Javier E. Villegas, J. Santamaria
Summary: Josephson effect is achieved over micrometres and at tens of kelvins by coupling the half-metallic manganite La0.7Sr0.3MnO3 with the superconducting cuprate YBa2Cu3O7. This opens new possibilities for superconducting spintronics and quantum computing.
Article
Materials Science, Multidisciplinary
Claudio Guarcello, Luca Chirolli, Maria Teresa Mercaldo, Francesco Giazotto, Mario Cuoco
Summary: This study demonstrates that a dynamical regime with oscillating phase evolution is a universal characteristic of driven Josephson systems with sign competition in the Josephson couplings, and can be initiated by changing the parameters that set the phase state.
Article
Chemistry, Multidisciplinary
Francesca Telesio, Matteo Carrega, Giulio Cappelli, Andrea Iorio, Alessandro Crippa, Elia Strambini, Francesco Giazotto, Manuel Serrano-Ruiz, Maurizio Peruzzini, Stefan Heun
Summary: We demonstrate evidence of Josephson coupling in a planar few-layer black phosphorus junction, confirming its existence and characteristics. These findings will accelerate further research on the unique properties of exfoliated black phosphorus thin flakes.
Article
Materials Science, Multidisciplinary
Daniel Margineda, Jill S. Claydon, Fatjon Qejvanaj, Chris Checkley
Summary: This study reports evidence of anomalous Josephson effect in superconducting-normal-superconducting (SNS) junctions that do not require Zeeman splitting or spin-orbit coupling. The authors demonstrate that a spontaneous phase emerges in the weak link by modifying the nonequilibrium conditions, similar to f0-junctions. Voltage-controlled phase shift is detected through magnetoresistance measurements, indicating an interplay of Aharanov-Bohm-like and conventional Josephson currents for the anomalous current-phase relation. These findings are significant for engineering superconducting nanocircuits with voltage-tunable quantum properties.
Article
Physics, Fluids & Plasmas
A. E. Botha, Yu. M. Shukrinov, J. Tekic, M. R. Kolahchi
Summary: In the superconductor-ferromagnet-superconductor Josephson junction, the magnetic layer provides additional degrees of freedom that lead to chaotic dynamics, which is not observed in the ordinary superconductor-insulator-superconductor Josephson junction. By studying various parameters, we discovered that chaos occurs when the Josephson frequency is close to the ferromagnetic frequency. Furthermore, the onset of chaos precedes the transition to the superconducting state as the dc-bias current decreases.
Article
Physics, Multidisciplinary
Dariush Mehrparvar, Nader Ghobadi, Reza Daqiq
Summary: The tunnel magneto-resistance ratio in spin-filter magnetic tunnel junctions with spin-orbit coupling is investigated using the non-equilibrium Green's function formalism. The transmission function is calculated in the linear-response limit. The results show that spin-filter magnetic tunnel junctions have a larger tunnel magneto-resistance compared to conventional magnetic tunnel junctions due to the presence of a spin-filter layer. Therefore, these findings open up new possibilities for improving spintronics.
Article
Physics, Condensed Matter
S. Mesoraca, S. Knudde, D. C. Leitao, S. Cardoso, M. G. Blamire
JOURNAL OF PHYSICS-CONDENSED MATTER
(2018)
Article
Chemistry, Physical
Ekta Bhatia, Abhishek Talapatra, Jyoti Ranjan Mohanty, Kartik Senapati
Article
Chemistry, Physical
Kun-Rok Jeon, Chiara Ciccarelli, Andrew J. Ferguson, Hidekazu Kurebayashi, Lesley F. Cohen, Xavier Montiel, Matthias Eschrig, Jason W. A. Robinson, Mark G. Blamire
Article
Physics, Applied
Ekta Bhatia, J. M. Devine-Stoneman, Zoe H. Barber, J. W. A. Robinson, Kartik Senapati
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Applied
Avanendra Singh, Kartik Senapati, Ranveer Singh, Parasmani Rajput, Tapobrata Som, Pratap K. Sahoo
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Condensed Matter
Ekta Bhatia, Zainab Hussain, V. Raghavendra Reddy, Zoe H. Barber, Kartik Senapati
Summary: This report investigates the additional resistance caused by scattering of electrons passing through ferromagnetic domain walls, as well as the possible spin-triplet supercurrent conversion effect in these domain walls. Experimental results indicate that in the superconducting state, the transport current may induce spin-triplet correlations in the ferromagnetic domain walls.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Ekta Bhatia, Anand Srivastava, James Devine-Stoneman, Nadia A. Stelmashenko, Zoe H. Barber, Jason W. A. Robinson, Kartik Senapati
Summary: Researchers have successfully realized a nanoscale S/F/S planar junction by patterning a ferromagnetic material, showing long-range triplet supercurrents crossing a ferromagnetic barrier. They have also demonstrated a ferromagnetic planar nano-SQUID device consisting of two spin-triplet Josephson junctions.
Article
Physics, Multidisciplinary
Halima Giovanna Ahmad, Martina Minutillo, Roberto Capecelatro, Avradeep Pal, Roberta Caruso, Gianluca Passarelli, Mark G. Blamire, Francesco Tafuri, Procolo Lucignano, Davide Massarotti
Summary: This study reports the detection of spin-triplet Cooper pairs in a heterostructure made of different materials. The coupling capabilities of the materials through functional interfaces pave the way for exciting experiments and advanced device design.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Applied
Ekta Bhatia, Kartik Senapati
Summary: The notion of competing ferromagnetic and superconducting orders in hybrid structures has undergone a transformation with the realization of ferromagnetic Josephson pi-junctions and the prediction of spin-triplet correlations in such structures. These hybrid structures are now studied as rich sources of emergent states and new effects.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
B. Stoddart-Stones, X. Montiel, M. G. Blamire, J. W. A. Robinson
Summary: Superconducting spintronics aims to enhance the performance of spintronics-based devices by utilizing the interaction between magnetic order and superconductivity. In this study, the authors experimentally investigate a superconducting spin valve and observe a crossover from giant magnetoresistance to the superconducting spin-valve effect as the thickness of the material changes.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Bidyadhar Das, Tapas Ranjan Senapati, Ashok Kumar Yadav, G. R. Umapathy, Sambhu Nath Jha, Kartik Senapati, Pratap Kumar Sahoo
Summary: This article explores the dynamics involved in the formation of NiBi3 thin films using the codeposition method. By studying films grown at different evaporation rates of Bi, it is found that almost stoichiometric NiBi3 is formed only at the top surface, while a nonlinear stoichiometric variation occurs toward the substrate. The bonding environment around Ni, studied by X-ray absorption spectroscopy, agrees with the findings of RBS. The observed superconducting transition and magnetic coercivity are consistent with the ratio of Ni and Bi.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Laxmipriya Nanda, Bidyadhar Das, Subhashree Sahoo, Pratap K. Sahoo, Kartik Senapati
Summary: We conducted a study on the growth of NiBi3 nanowires and nanorods during the preparation of super-conducting NiBi3 films by co-evaporation of Ni and Bi. The films grown via this method achieve higher transition temperatures compared to single crystal NiBi3, but sometimes nanoscale features like nanowires and nanorods appear on the film surfaces. The growth of NiBi3 nanorods could be controlled by the deposition rate of Bi and elevated temperatures promote the emergence of long single crystalline nanorods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Pratiksha Pratap, Laxmipriya Nanda, Kartik Senapati, R. P. Aloysius, Venugopal Achanta
Summary: We studied the effect of nitrogen partial pressure on the growth of NbTiN thin films and found that the optimal window for achieving the highest critical temperature (T(C)) and epitaxial growth is between 5.8% and 8.51% N-2 content. The T(C) showed a nonlinear variation with N-2 content, while the values of B(C2)(0), diffusion coefficient, and coherence length showed a linear dependence.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
H. S. Alagoz, B. Prasad, J. Jeon, M. G. Blamire, K. H. Chow, J. Jung
Article
Physics, Applied
Konstantinos Rogdakis, Noah Alfert, Anand Srivastava, Jason W. A. Robinson, Mark G. Blamire, Lesley F. Cohen, Hidekazu Kurebayashi
APPLIED PHYSICS EXPRESS
(2018)