On heat capacity of nanoclusters with a shell structure

Baturin, Vladimir S.; Losyakov, V. V.

doi:10.1134/s1063776111010031

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…Size-resolved metal nanocluster particles display a number of distinctive quantum size effects, one of the most remarkable being their “superatom”-like electronic shell structure. , It has been predicted that as a result of the shell levels’ high degeneracy, nanoclusters composed of just tens to hundreds of atoms can display pair correlations associated with the superconducting state. − For certain sizes and materials, the pairing may become exceptionally strong. Such effects should have spectroscopic manifestations.…”

Section: Resultsmentioning

confidence: 99%

A Novel Feature in Aluminum Cluster Photoionization Spectra and Possibility of Electron Pairing at T ≳ 100 K

2015

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A unique property of size-resolved metal nanocluster particles is their "superatom"-like electronic shell structure. The shell levels are highly degenerate, and it has been predicted that this can enable exceptionally strong superconducting-type electron pair correlations in certain clusters composed of just tens to hundreds of atoms. Here we report on the observation of a possible spectroscopic signature of such an effect. A bulge-like feature appears in the photoionization yield curve of a free cold aluminum cluster and shows a rapid rise as the temperature approaches ≈100 K. This is an unusual effect, not previously reported for clusters. Its characteristics are consistent with an increase in the effective density of states accompanying a pairing transition, which suggests a high-temperature superconducting state with Tc ≳ 100 K. Our results highlight the promise of metal nanoclusters as high-Tc building blocks for materials and networks.

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Section: Resultsmentioning

confidence: 99%

A Novel Feature in Aluminum Cluster Photoionization Spectra and Possibility of Electron Pairing at T ≳ 100 K

2015

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“…The publication [13] was followed by a number of calculations by different groups [14,[33][34][35]. Thus the prediction of high-temperature superconducting pairing in individual size-selected clusters with shell structure rests on solid theoretical foundation and is ripe for experimental verification.…”

Section: Introductionmentioning

confidence: 99%

“…As a new class of high-temperature superconductors, such metal nanocluster particles are promising building blocks for high-T c materials, devices, and networks. destroy the pairing transition: thanks to the large values of T c and Δ, the coherence length becomes small, i.e., comparable to the cluster size, hence in this respect the system is not zero-dimensional.The publication [13] was followed by a number of calculations by different groups [14,[33][34][35]. Thus the prediction of high-temperature superconducting pairing in individual size-selected clusters with shell structure rests on solid theoretical foundation and is ripe for experimental verification.What is nontrivial, of course, is how to probe for the appearance of pairing correlations in individual clusters flying in a molecular beam.…”

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confidence: 99%

Spectroscopy of metal “superatom” nanoclusters and high-Tcsuperconducting pairing

Halder

Kresin

2015

Phys. Rev. B

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A unique property of metal nanoclusters is the "superatom" shell structure of their delocalized electrons.The electronic shell levels are highly degenerate and therefore represent sharp peaks in the density of states. This can enable exceptionally strong electron pairing in certain clusters composed of tens to hundreds of atoms. In a finite system, such as a free nanocluster or a nucleus, pairing is observed most clearly via its effect on the energy spectrum of the constituent fermions. Accordingly, we performed a photoionization spectroscopy study of size-resolved aluminum nanoclusters and observed a rapid rise of the near-threshold density of states of several clusters (Al 37,44,66,68 ) with decreasing temperature. The characteristics of this behavior are consistent with compression of the density of states by a pairing transition into a high-temperature superconducting state with T c ≳100 K. This value exceeds that of bulk aluminum by two orders of magnitude. These results highlight the potential of novel pairing effects in size-quantized systems and the possibility to attain even higher critical temperatures by optimizing the particles' size and composition. As a new class of high-temperature superconductors, such metal nanocluster particles are promising building blocks for high-T c materials, devices, and networks.

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High-Temperature Superconductivity in Size-Selected Metal Nanoclusters: Gas-Phase Spectroscopy and Prototype Devices for Deposition Studies

Edwards

Khojasteh

Halder

et al. 2021

J Supercond Nov Magn

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On heat capacity of nanoclusters with a shell structure

Cited by 3 publications

References 10 publications

A Novel Feature in Aluminum Cluster Photoionization Spectra and Possibility of Electron Pairing at T ≳ 100 K

A Novel Feature in Aluminum Cluster Photoionization Spectra and Possibility of Electron Pairing at T ≳ 100 K

Spectroscopy of metal “superatom” nanoclusters and high-Tcsuperconducting pairing

High-Temperature Superconductivity in Size-Selected Metal Nanoclusters: Gas-Phase Spectroscopy and Prototype Devices for Deposition Studies

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