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説明:

The emergence of superconductivity in doped insulators such as cuprates and pnictides coincides with their doping-driven insulator–metal transitions. Above the critical doping threshold, a metallic state sets in at high temperatures, while superconductivity sets in at low temperatures. An unanswered question is whether the formation of Cooper pairsin a well-established metal will inevitably transform the host material into a superconductor, as manifested by a resistance drop. Here, this question is addressed by investigating the electrical transport in nanoscale rings (full loops) and half loops manufactured from heavily boron-doped diamond. It is shown that in contrast to the diamond half-loops (DHLs) exhibiting a metal–superconductor transition, the diamond nanorings (DNRs) demonstrate a sharp resistance increase up to 430% and a giant negative “magnetoresistance” below the superconducting transition temperature of the starting material. The finding of the unconventional giant negative “magnetoresistance”, as distinct from existing categories of magnetoresistance, that is, the conventional giant magnetoresistance in magnetic multilayers, the colossal magnetoresistance in perovskites, and the geometric magnetoresistance in semiconductor–metal hybrids, reveals the transformation of the DNRs from metals to bosonic semiconductors upon the formation of Cooper pairs. DNRs like these could be used to manipulate Cooper pairs in superconducting quantum devices.

権利情報:

• In Copyright
  

  This is the pre-peer reviewed version of the following article: Unconventional Giant “Magnetoresistance" in Bosonic Semiconducting Diamond Nanorings, which has been published in final form at https://doi.org/10.1002/adma.202211129. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

キーワード: bosonic semiconductors, diamond nanorings, diamond nanowires, trapping of Cooper pairs, unconventional giant magnetoresistance

刊行年月日: 2023-04-07

出版者: Wiley

掲載誌:

• ADVANCED MATERIALS (ISSN: 09359648) vol. 35 issue. 22 p. 2211129-2211129

研究助成金:

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.4274

公開URL: https://doi.org/10.1002/adma.202211129

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更新時刻: 2024-01-05 22:12:59 +0900

MDRでの公開時刻: 2023-12-06 13:30:40 +0900