Tunnelling studies on sodium tungsten bronzes near the metal-insulator transition
Journal of Physics: Condensed Matter, ISSN: 0953-8984, Vol: 5, Issue: 44, Page: L551-L558
1993
- 8Citations
- 5Captures
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Article Description
We present measurements of tunnelling conductances (at T=4.2 K) of point contact and planar junctions formed on sodium tungsten bronze single crystals as the carrier concentration is changed through the metal-insulator (MI) transition. We find that the junction conductance is varies as mod V mod on the metallic side, and that as the MI transition is approached, the voltage dependence becomes deeper and changes to a linear dependence ( varies as mod V mod ) in the critical region. We interpret this observed behaviour as being due to evolution of short-range screened Coulomb interactions (giving rise to a square-root cusp in the density of states) in the disordered metallic phase into an Efros-Shklovskii-type Coulomb gap in the insulating phase. The possibility of breakdown of normal Fermi-liquid-like behaviour in the critical region is discussed.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0041512593&origin=inward; http://dx.doi.org/10.1088/0953-8984/5/44/002; https://iopscience.iop.org/article/10.1088/0953-8984/5/44/002; http://stacks.iop.org/0953-8984/5/i=44/a=002/pdf; https://dx.doi.org/10.1088/0953-8984/5/44/002; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=2a1e7ce7-e5f9-45e9-819c-27ce8180e6cb&ssb=64625244027&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F0953-8984%2F5%2F44%2F002&ssi=aefc999c-8427-4658-bf72-af839ac42b78&ssk=support@shieldsquare.com&ssm=327243283247937031389674836057892350&ssn=5a89734a6ee7ee952ea3745288c4e0d40b4b17f9ea44-4e1f-4e35-b1b080&sso=ff49715e-f9d9f87a371fedafa6db52c64b172afcf2fdd90ef2ffe283&ssp=19465728281719317295171981396604228&ssq=84625592341660602631505699169723912390630&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJyZCI6ImlvcC5vcmciLCJfX3V6bWYiOiI3ZjYwMDBjMGI2MzM1NC00OGRkLTRjNTUtODVmZS00NzZmMjgxYzE5ZDgxNzE5MzA1Njk5NDA1NTE3NzE2OTI5LTY4OTMzZTk2ODBiMmY0NjUxMzg5NTUiLCJ1em14IjoiN2Y5MDAwMWUxYTVkMGQtYjRlNi00ZTQ0LWFmYTgtNzUxMTFmZjg0ZDlmNy0xNzE5MzA1Njk5NDA1NTE3NzE2OTI5LTk0ZDkxMTlmZmI5YTk0YTcxMzg5NTIifQ==
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