Unexpected observation of spatially separated Kondo scattering and ferromagnetism in Ta alloyed anatase TiO2 thin films.
Tarapada Sarkar,Kalon Gopinadhan,Mallikarjuna Rao Motapothula,Surajit Saha,Zhiwei Huang,Sankar Dhar,Abhijeet Patra,W. M. Lü,Francesca Telesio,Ilaria Pallecchi,Ariando,Daniele Marré,Thirumalai Venkatesan +12 more
TLDR
The observation of spatially separated Kondo scattering and ferromagnetism in anatase Ta0.06Ti0.94O2 thin films as a function of thickness is reported to study the effect of neighboring presence of two competing magnetic phenomena and the possibility for tuning them.Abstract:
We report the observation of spatially separated Kondo scattering and ferromagnetism in anatase Ta0.06Ti0.94O2 thin films as a function of thickness (10–200 nm). The Kondo behavior observed in thicker films is suppressed on decreasing thickness and vanishes below ~25 nm. In 200 nm film, transport data could be fitted to a renormalization group theory for Kondo scattering though the carrier density in this system is lower by two orders of magnitude, the magnetic entity concentration is larger by a similar magnitude and there is strong electronic correlation compared to a conventional system such as Cu with magnetic impurities. However, ferromagnetism is observed at all thicknesses with magnetic moment per unit thickness decreasing beyond 10 nm film thickness. The simultaneous presence of Kondo and ferromagnetism is explained by the spatial variation of defects from the interface to surface which results in a dominantly ferromagnetic region closer to substrate-film interface while the Kondo scattering is dominant near the surface and decreasing towards the interface. This material system enables us to study the effect of neighboring presence of two competing magnetic phenomena and the possibility for tuning them.read more
Citations
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Anatase TiO2—A Model System for Large Polaron Transport
Bixing Yan,Dongyang Wan,Xiao Chi,Changjian Li,Mallikarjuna Rao Motapothula,Sonu Hooda,Ping Yang,Zhen Huang,Shengwei Zeng,Akash Gadekar Ramesh,Stephen J. Pennycook,Andrivo Rusydi,Ariando,Jens Martin,Thirumalai Venkatesan +14 more
TL;DR: The screening of the electron-phonon (e-ph) coupling by excess carriers is necessary to explain this unusual dependence and the various transport behaviors could be organized into a single phase diagram, which clarifies the evolution of large polaron in this material.
Journal ArticleDOI
The dramatic enhancement of ferromagnetism and band gap in Fe-doped In2O3 nanodot arrays.
TL;DR: The nanodot arrays exhibit the ferromagnetism at room temperature, where the magnetic moment increases as the dot size is reduced, rising to a maximum of about 230 emu/cm3 (equivalent to an average moment on the Fe ions of 15.30 µB/Fe).
Journal ArticleDOI
Origin of room temperature ferromagnetism in SnO 2 films
TL;DR: In this article, the saturation magnetization (M s ) of the SnO 2 films exhibits a decreasing trend followed by increasing with the growth temperature increased from RT to 400℃.
Dissertation
Effect of oxygen vacancies on the structural and transport properties of SrTiO3 thin films: experiments and ab-initio calculations
TL;DR: In this article, the effects of oxygen vacancies and strain on the structural and transport properties of strained SrTiO3 thin films, fabricated by pulsed laser deposition technique, have been investigated.
Journal ArticleDOI
Observations of the Kondo effect and its coexistence with ferromagnetism in a magnetically undoped metal oxide nanostructure
TL;DR: In this paper, the authors reported unusual observations of Kondo effect and coexistence of ferromagnetism in indium tin oxide (ITO) nanowires that were synthesized without incorporating any magnetic impurities.
References
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The renormalization group: Critical phenomena and the Kondo problem
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Journal ArticleDOI
Resistance Minimum in Dilute Magnetic Alloys
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Journal ArticleDOI
Kondo effect in a single-electron transistor
David Goldhaber-Gordon,David Goldhaber-Gordon,Hadas Shtrikman,Diana Mahalu,David Abusch-Magder,U. Meirav,Marc Kastner +6 more
TL;DR: In this paper, the binding energy of the spin singlet has been observed in a single-electron transistor (SET) with only two electrodes and without control over the structure.
Journal ArticleDOI
Kondo Physics in a Single Electron Transistor
David Goldhaber-Gordon,Hadas Shtrikman,Diana Mahalu,David Abusch-Magder,U. Meirav,Marc Kastner +5 more
TL;DR: Meir et al. as mentioned in this paper reported measurements on a new generation of SETs that display all the aspects of the Kondo phenomenon: the spin singlet forms and causes an enhancement of the zero-bias conductance when the number of electrons on the artificial atom is odd but not when it is even.
Journal ArticleDOI
Anisotropic ferromagnetism in substituted zinc oxide.
TL;DR: Results are interpreted in terms of a spin-split donor impurity-band model, which can account for ferromagnetism in insulating or conducting high-k oxides with concentrations of magnetic ions that lie far below the percolation threshold.
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