arXiv subjects

Armando Galluzzi

Publications and source records attributed to Armando Galluzzi.

3 recordsLinked to original sources

arXiv2024

Comments on "Fundamental nature of the self-field critical current in superconductors", arxiv:2409.16758

We provide comments on article "Fundamental nature of the self-field critical current in superconductors" by Talantsev and Tallon, arXiv:2409.16758 and https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4978589 related to the predictions of the key equation proposed in article "Universal self-field critical current for thin-film superconductors," by Talantsev and Tallon, Nat. Commun. 6 (2015) 7820. We respond to claims and assertions made in these articles and also show that the so-called "Universal self-field critical current" and the "fundamental limit" for self-field Jc suggested by Talantsev and Tallon, has been proven incorrect experimentally and this invalidates the key claims and findings stated in both these articles.

cond-mat.supr-con↗

arXiv2024

Comments on "Procedures for proper validation of record critical current density claims" by Chiara Tarantini and David C. Larbalestier

We provide comments on article titled "Procedures for proper validation of record critical current density claims" by Chiara Tarantini and David C. Larbalestier, arXiv:2410.22195. We respond to claims and assertions that the expressions for calculation of $J_{c,mag}$ from magnetic moments proposed in Polichetti et al. 2024, arXiv:2410.09197, are incorrect. We show that the analysis presented in Tarantini and Larbalestier is wrong. We also re-emphasize the expression presented in Polichetti et al. for calculation of $J_{c,mag}$ from magnetic moments in which the pre-factor is dimensionless and has NO units. We make the case for establishment of national user facilities for measurement of transport $J_c(H,T,\theta)$ that are easily accessible in an equitable and rapid manner to enable much needed advances in the field.

cond-mat.supr-con↗

arXiv2021

Magnetic instabilities in quasi-one-dimensional Cr-based material

The magnetic response of a K2Cr3As3 sample has been studied by means of dc magnetization measurements as a function of magnetic field (H) at different temperatures ranging from 5 K up to 300 K. Looking at the magnetic hysteresis loops m(H), a diamagnetic behavior of the sample has been inferred at temperatures higher than 60 K, whereas at lower temperatures the sample shows a hysteresis loop compatible with the presence of ferrimagnetism. Moreover, several spike-like magnetization jumps, both positive and negative, have been observed at certain fields in the range -1000 Oe < H < 1000 Oe, regardless of the temperature considered. The field position of the magnetization jumps has been studied at different temperatures, and their distribution can be described by a Lorentzian curve.

cond-mat.supr-con↗