Microscopic Magnetic Characterization of Quantum Criticality in LaCrGe<sub>3</sub> using <sup>139</sup>La NMR under Pressure
ORAL
Abstract
LaCrGe3 is a peculiar itinerant ferromagnet with a unique route to avoid a ferromagnetic quantum critical point (QCP) by not only changing the order of the phase transition from second to first, but also through the appearance of a high-pressure magnetic phase. Expanding on earlier work which suggested that the high-pressure magnetic phase could be a short-range magnetically ordered cluster phase, 139La nuclear magnetic resonance (NMR) measurements were carried out under pressure up to 2.64 GPa. The NMR spectrum measurements suggest that a ferromagnetic order develops below 50 K at pressures higher than ~1.5 GPa under the applied magnetic field of 7.2 T. Furthermore, three-dimensional ferromagnetic fluctuations were found in the paramagnetic state which persisted even at high pressures close to the putative QCP. These findings provide a novel insight into the quantum criticality of this system.
*This work was supported by the USDOE, Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract No. DE-AC02-07CH11358. Part of the work was supported by the Japan Soiety for the Promotion of Science KAKENHI Grants No. JP15H05882, JP15H05885, JP15K21732, and JP18H04321 (J-Physics).
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Publication: Magnetic properties of the itinerant ferromagnet LaCrGe3 under pressure studied by 139La NMR "K. Rana, H. Kotegawa, R. R. Ullah, E. Gati, S. L. Bud'ko, P. C. Canfield, H. Tou, V. Taufour, and Y. Furukawa, Phys. Rev. B 103 174426 (2021) (Editor's suggestion) DOI: 10. 1103/PhysRevB.103.174426
Presenters
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Khusboo Rana
- Ames Laboratory