Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solder
Sn–Pb solders are superconducting materials whose Sn and Pb are perfectly phase-separated. Recently, anomalous magnetic-flux trapping in a Sn45–Pb55 solder has been revealed, where the magnetic fluxes are selectively trapped in the Sn regions due to the supercurrents in the surrounding Pb regions. H...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2023-12-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0183526 |
| _version_ | 1797367036946415616 |
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| author | Takumi Murakami Hiroto Arima Yoshikazu Mizuguchi |
| author_facet | Takumi Murakami Hiroto Arima Yoshikazu Mizuguchi |
| author_sort | Takumi Murakami |
| collection | DOAJ |
| description | Sn–Pb solders are superconducting materials whose Sn and Pb are perfectly phase-separated. Recently, anomalous magnetic-flux trapping in a Sn45–Pb55 solder has been revealed, where the magnetic fluxes are selectively trapped in the Sn regions due to the supercurrents in the surrounding Pb regions. Here, we report on the observation of the anomalous critical field (Hc)-temperature (T) phase diagram of superconductivity in the Sn45–Pb55 solder. Although the Hc(T) for the Pb regions decreases with increasing field as in normal type-I superconductors and is consistent with the conventional trend with Hc(0) ∼ 800 Oe, the Hc(T) for the Sn regions exhibits anomalous behaviors. The most noticeable trend was observed in the field-cooled (under 1500 Oe) solder. The Hc-T phase diagram for the Sn regions largely varies when the applied external field is reversed, and Tc increases with increasing field amplitude when H < 0 Oe is applied. On the basis of the flux trapping and the observed anomalous Hc-T phase diagrams, we propose that the field-robust superconductivity in the Sn regions is related to the ferromagnetically aligned magnetic fluxes (or formation of vortices) in the Sn regions of the Sn45–Pb55 solder. |
| first_indexed | 2024-03-08T17:13:15Z |
| format | Article |
| id | doaj.art-bce1552384ff4aaeb51e5e26d31303d2 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-03-08T17:13:15Z |
| publishDate | 2023-12-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-bce1552384ff4aaeb51e5e26d31303d22024-01-03T19:51:06ZengAIP Publishing LLCAIP Advances2158-32262023-12-011312125008125008-510.1063/5.0183526Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solderTakumi Murakami0Hiroto Arima1Yoshikazu Mizuguchi2Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji 192-0397, JapanDepartment of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji 192-0397, JapanDepartment of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji 192-0397, JapanSn–Pb solders are superconducting materials whose Sn and Pb are perfectly phase-separated. Recently, anomalous magnetic-flux trapping in a Sn45–Pb55 solder has been revealed, where the magnetic fluxes are selectively trapped in the Sn regions due to the supercurrents in the surrounding Pb regions. Here, we report on the observation of the anomalous critical field (Hc)-temperature (T) phase diagram of superconductivity in the Sn45–Pb55 solder. Although the Hc(T) for the Pb regions decreases with increasing field as in normal type-I superconductors and is consistent with the conventional trend with Hc(0) ∼ 800 Oe, the Hc(T) for the Sn regions exhibits anomalous behaviors. The most noticeable trend was observed in the field-cooled (under 1500 Oe) solder. The Hc-T phase diagram for the Sn regions largely varies when the applied external field is reversed, and Tc increases with increasing field amplitude when H < 0 Oe is applied. On the basis of the flux trapping and the observed anomalous Hc-T phase diagrams, we propose that the field-robust superconductivity in the Sn regions is related to the ferromagnetically aligned magnetic fluxes (or formation of vortices) in the Sn regions of the Sn45–Pb55 solder.http://dx.doi.org/10.1063/5.0183526 |
| spellingShingle | Takumi Murakami Hiroto Arima Yoshikazu Mizuguchi Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solder AIP Advances |
| title | Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solder |
| title_full | Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solder |
| title_fullStr | Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solder |
| title_full_unstemmed | Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solder |
| title_short | Anomalous field-temperature phase diagram of superconductivity in Sn–Pb solder |
| title_sort | anomalous field temperature phase diagram of superconductivity in sn pb solder |
| url | http://dx.doi.org/10.1063/5.0183526 |
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