⁵¹V NMR spectroscopy on single crystal of A15 superconductor V₃Si down to milliKelvin temperatures

The A15 superconductor V₃Si, though well-studied for decades, continues to yield insights into its superconducting phase, as made possible by (1) newer methods in NMR spectroscopy, (2) on high-quality, single-crystal samples, and (3) at temperatures down to the milliKelvin range. After finding evidence that the Martensitic transformation (MT) occurs over a range of temperatures in which transformed and untransformed phases coexist [Gapud et al., Physica C, vol. 602, 1354137], new data on (1) the temperature dependence of the Knight shift show effects due to the MT not seen in previous studies, including a possible regime reminiscent of pseudogap phase and/or a Jahn-Teller effect; and (2) the temperature dependence of the NMR longitudinal relaxation time T1 strongly supporting a single superconducting gap -- as will be reported and discussed.