Absence of strong magnetic fluctuations or interactions in the normal state of LaNiGa$_2$
P. Sherpa, I. Vinograd, Y. Shi, S. A. Sreedhar, C. Chaffey, T., Kissikov, M.-C. Jung, A. S. Bontana, A. P. Dioguardi, R. Yamamoto, M. Hirata,, G. Conti, S. Nemsak, J. R. Badger, P. Klavins, I. Vishik, V. Taufour, and N., J. Curro
TL;DR
This study uses NMR, NQR, and magnetization measurements to show that LaNiGa$_2$ lacks significant magnetic fluctuations or interactions in its normal state, indicating that its superconducting properties are not driven by strong electron correlations.
Contribution
The paper provides the first detailed magnetic resonance and magnetization data demonstrating the absence of magnetic fluctuations in LaNiGa$_2$, clarifying the nature of its superconductivity.
Findings
No evidence of magnetic fluctuations in LaNiGa$_2$
Absence of enhanced paramagnetism in the normal state
Superconducting time-reversal symmetry breaking is not due to strong correlations
Abstract
We present nuclear magnetic (NMR) and qudrupole (NQR) resonance and magnetization data in the normal state of the topological crystalline superconductor LaNiGa. We find no evidence of magnetic fluctuations or enhanced paramagnetism. These results suggest that the time-reversal symmetry breaking previously reported in the superconducting state of this material is not driven by strong electron correlations.
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Taxonomy
TopicsRare-earth and actinide compounds · Physics of Superconductivity and Magnetism · Magnetic Properties of Alloys