Quantum Size Effect Probed by NMR Measurements

Tomonori Okuno, Shunsaku Kitagawa, Kenji Ishida (), Kohei Kusada and Hiroshi Kitagawa
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Tomonori Okuno: Kyoto University
Shunsaku Kitagawa: Kyoto University
Kenji Ishida: Kyoto University
Kohei Kusada: Kyoto University
Hiroshi Kitagawa: Kyoto University

Chapter Chapter 14 in Creative Complex Systems, 2021, pp 215-230 from Springer

Abstract: Abstract NanoparticleNanoparticle systems are important in both applied and fundamental studies. In 1962, the theory of nanoparticlesNanoparticle by R. Kubo predicted that the discrete energy levels in nanoparticlesNanoparticle were realized and that their physical quantities behave differently from that of bulk at low temperatures where the thermal fluctuations fall down the energy spacing of the discrete energy levels. In addition, the behavior of physical quantities depends on the parity of the number of the electrons in a nanoparticleNanoparticle. This phenomenon is termed the quantum size effectQuantum size effect (QSE). Although various studies on nanoparticlesNanoparticle have been conducted to date, QSEs are not well separated from surface effects, which originate from the difference between surface and interior regions of nanoparticles. We succeeded in the separation of QSEs and surface effects, and found novel magnetic fluctuations related to QSEs in Pt nanoparticles. The magnetic fluctuations at low temperatures are not caused by surface effects or magnetic order, and their energy scale seems to be independent of electronic correlation. Further studies on such magnetic fluctuations are in progress.

Keywords: Nano particle; Quantum size effect; Kubo effect; NMR; Knight shift (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:spr:crechp:978-981-16-4457-3_14

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DOI: 10.1007/978-981-16-4457-3_14

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