Localization Phenomena in Disordered Tantalum Films
Using dc transport and wide-band spectroscopic ellipsometry techniques we study localization phenomena in highly disordered metallic β -Ta films grown by rf sputtering deposition. The dc transport study implies non-metallic behavior (d ρ /dT < 0), with negative temperature coefficien...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/7/7/257 |
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| author | Natalia Kovaleva Dagmar Chvostova Alexandr Dejneka |
| author_facet | Natalia Kovaleva Dagmar Chvostova Alexandr Dejneka |
| author_sort | Natalia Kovaleva |
| collection | DOAJ |
| description | Using dc transport and wide-band spectroscopic ellipsometry techniques we study localization phenomena in highly disordered metallic β -Ta films grown by rf sputtering deposition. The dc transport study implies non-metallic behavior (d ρ /dT < 0), with negative temperature coefficient of resistivity (TCR). We found that as the absolute TCR value increased, specifying an elevated degree of disorder, the free charge carrier Drude response decreases, indicating the enhanced charge carrier localization. Moreover, we found that the pronounced changes occur at the extended spectral range, involving not only the Drude resonance, but also the higher-energy Lorentz bands, in evidence of the attendant electronic correlations. We propose that the charge carrier localization, or delocalization, is accompanied by the pronounced electronic band structure reconstruction due to many-body effects, which may be the key feature for understanding the physics of highly disordered metals. |
| first_indexed | 2024-12-13T05:55:11Z |
| format | Article |
| id | doaj.art-57f3d2e038b449b189ed46bb8826e46f |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-13T05:55:11Z |
| publishDate | 2017-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-57f3d2e038b449b189ed46bb8826e46f2022-12-21T23:57:27ZengMDPI AGMetals2075-47012017-07-017725710.3390/met7070257met7070257Localization Phenomena in Disordered Tantalum FilmsNatalia Kovaleva0Dagmar Chvostova1Alexandr Dejneka2Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 18221, Czech RepublicInstitute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 18221, Czech RepublicInstitute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 18221, Czech RepublicUsing dc transport and wide-band spectroscopic ellipsometry techniques we study localization phenomena in highly disordered metallic β -Ta films grown by rf sputtering deposition. The dc transport study implies non-metallic behavior (d ρ /dT < 0), with negative temperature coefficient of resistivity (TCR). We found that as the absolute TCR value increased, specifying an elevated degree of disorder, the free charge carrier Drude response decreases, indicating the enhanced charge carrier localization. Moreover, we found that the pronounced changes occur at the extended spectral range, involving not only the Drude resonance, but also the higher-energy Lorentz bands, in evidence of the attendant electronic correlations. We propose that the charge carrier localization, or delocalization, is accompanied by the pronounced electronic band structure reconstruction due to many-body effects, which may be the key feature for understanding the physics of highly disordered metals.https://www.mdpi.com/2075-4701/7/7/257disordered metalsweak and Anderson localizationdc transportspectroscopic ellipsometry |
| spellingShingle | Natalia Kovaleva Dagmar Chvostova Alexandr Dejneka Localization Phenomena in Disordered Tantalum Films Metals disordered metals weak and Anderson localization dc transport spectroscopic ellipsometry |
| title | Localization Phenomena in Disordered Tantalum Films |
| title_full | Localization Phenomena in Disordered Tantalum Films |
| title_fullStr | Localization Phenomena in Disordered Tantalum Films |
| title_full_unstemmed | Localization Phenomena in Disordered Tantalum Films |
| title_short | Localization Phenomena in Disordered Tantalum Films |
| title_sort | localization phenomena in disordered tantalum films |
| topic | disordered metals weak and Anderson localization dc transport spectroscopic ellipsometry |
| url | https://www.mdpi.com/2075-4701/7/7/257 |
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