Unconventional Giant "Magnetoresistance" in Bosonic Semiconducting Diamond Nanorings.

Autor: Zhang G; Danish Institute for Advanced Study and Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sonderborg, DK-6400, Denmark., Zulkharnay R; School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK., Ke X; Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China., Liao M; Research Center for Functional Materials, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan., Liu L; Laboratory for Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Heverlee, B-3001, Belgium., Guo Y; Photonics Research Group, Department of Information Technology, Ghent University-IMEC, Ghent, 9052, Belgium., Li Y; Hunan Key Laboratory of Nanophotonics and Devices, School of Physics & Electronics and School of Materials Science & Engineering, Central South University, Changsha, 410083, China., Rubahn HG; Danish Institute for Advanced Study and Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sonderborg, DK-6400, Denmark., Moshchalkov VV; Department of Physics and Astronomy, KU Leuven, Heverlee, B-3001, Belgium., May PW; School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2023 Jun; Vol. 35 (22), pp. e2211129. Date of Electronic Publication: 2023 Apr 07.
DOI: 10.1002/adma.202211129
Abstrakt: 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.
(© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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