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Absence of an insul...
Absence of an insulator-metal transition in Rb4C60 up to 2 GPa
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- Iwasiewicz-Wabnig, Agnieszka (författare)
- Umeå universitet,Institutionen för fysik
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- Wågberg, Thomas (författare)
- Umeå universitet,Institutionen för fysik
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- Makarova, Tatiana (författare)
- Umeå universitet,Institutionen för fysik
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- Sundqvist, Bertil (författare)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- 2008
- 2008
- Engelska.
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Ingår i: Physical Review B. - 0163-1829. ; 77:8, s. 085434-
- Relaterad länk:
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http://scitation.aip...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present the results of direct resistance measurements on Rb4C60 under pressures up to 2 GPa. At all pressures covered by this study and over the temperature range of 90–450 K Rb4C60 is a semiconductor with a weakly pressure dependent band gap near 0.7 eV. We do not observe the insulator-to-metal transition previously reported to occur below 1.2 GPa, although we cannot rule out the possibility that such a transition might occur at some significantly higher pressure. The measured resistivity is surprisingly low and is dominated by carriers excited over a 0.1 eV gap. Because the corresponding conductivity increases with deformation of the sample, we assign these states to structural or orientational defects. The known structural transformation below 0.5 GPa leads to a decrease in resistivity under high pressure, but the material remains semiconducting. A Rb6C60 control sample showed a similar behavior, also being a semiconductor under all conditions studied. At temperatures above 460 K, Rb was partially lost from our samples, resulting in metallization by a transformation into Rb3C60.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Fullerene
- C60
- fulleride
- Rb3C60
- Rb4C60
- Rb6C60
- high pressure
- metal-insulator transition
- phase transition
- resistance
- conductance
- semiconductor
- band gap
- gap states
- superconductivity
- critical temperature
- Raman spectroscopy
- X-ray diffraction
- susceptibility
- NMR
- Condensed matter physics
- Kondenserade materiens fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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