Magnetization measurements of non-centrosymmetric superconductor LaPt₃Si: Construction of low temperature magnetometers with the SQUID and Hall sensor

Abstract

We report magnetization of a non-centrosymmetric superconductor, LaPt3Si below 0.6 K up to 200 Oe. The home-made SQUID and Hall sensor magnetometers that operate below 1 K were constructed for this purpose. Although the SQUID magnetometer is more sensitive than the Hall sensor’s one, it was found not to work correctly for the rapid magnetization change of LaPt3Si below 0.4 K. The Hall sensor magnetometer, in contrast, can properly detect magnetization jumps in the M–H curve of the superconducting state. The observed flux jumps are probably related to the interfusion of the mixed state of the LaPt3Si that is observed in the μSR measurements.

Phase diagrams of vortex matter with multi-scale inter-vortex interactions in layered superconductors

“…[13][14][15][16][17][18][19] The first claim of experimental observation of this behavior was originally reported in works on MgB 2 [20][21][22] . Recently a similar claim was reported in experimental studies of Sr 2 RuO 4 4,23 and LaPt 3 Si 24,25 . The non-monotonic inter-vortex interaction is also possible in electromagnetically or proximity-effect-coupled bilayers.…”

Time-dependent Ginzburg–Landau equations for multi-gap superconductors*

“…[10][11][12][13] The novel magnetic responses, including unconventional disordered magnetic vortex patterns, cluster-like structures in small-size samples and stripes/gossamers in larger ones, were firstly experimentally observed in a two-gap superconductor, MgB 2 , [14][15][16] and then in Sr 2 RuO 4 , LaPt 3 Si and many other materials. [17][18][19][20][21][22][23][24][25][26] Moshchalkov et al termed this phenomenon as type-1.5 superconductivity. [14] Meanwhile, extensive theoretical investigations have been carried out on this novel phenomenon.…”

Type-1.5 superconductivity in multicomponent systems

“…24 Recently experimental works proposed that this state is realised in Sr 2 RuO 4 26,27 and LaPt 3 Si. 28,29 The experiments on the MgB 2 were done using Bitter decoration, scanning SQUID and scanning Hall probes. 24,25 The analysis of the nature of vortex clustering was done by cycling field and observing vortex cluster formation in different parts of the sample.…”