Origin of low specific heat and possible self-heating in field-cooled Sn-Pb solders
arxiv(2024)
摘要
Magnetic flux trapping in field-cooled (FC) Sn-Pb solders has been recently
studied because of the observation of nonvolatile magneto-thermal switching [H.
Arima et al., Commun. Mater. 5, 34 (2024)] and anomalous magnetic
field-temperature (H-T) phase diagrams [T. Murakami et al., AIP Adv. 13, 125008
(2023)]. In this paper, we investigate the origin of the anomalously low
specific heat (C) in Sn10-Pb90 and Sn45-Pb55 solders after FC at H = 1500 Oe.
We show that the FC solders exhibit self-heating possibly caused by the flux
flow during the reduction of trapped fluxes when heating the sample during the
C measurements. The T dependence of T rise clearly exhibits unexpectedly large
values when the low-C states are observed. In addition, the cause of the
transition-like behavior in C-T of FC solders are explained by local heating
during H control and flux-jump phenomena.
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