Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe<sub>3</sub>
ORAL
Abstract
LaCrGe3 has emerged as a model system for the study of the avoidance of ferromagnetic (FM) quantum criticality in itinerant magnets [1,2]. In this talk, we will present our results from combining thermodynamic, transport, x-ray and neutron scattering as well as μSR measurements on LaCrGe3 under pressure to identify the various phases in the phase diagram across the avoided FM quantum-critical point. We present thermodynamic evidence (i) for the first-order character of the FM transition at lowest temperatures and (ii) for the formation of new phases at high pressures. From our microscopic data, we infer that short-range FM ordered clusters rather than long-range modulated antiferromagnetism exist in these high-pressure phases. Overall, our results suggest that the phase diagram of LaCrGe3 combines features that are usually associated with avoided criticality in either clean or strongly disordered FM metals.
[1] Taufour et al., PRL 117, 037207 (2016); [2] Kaluarachchi et al., Nat. Commun. 8, 546 (2017).
[1] Taufour et al., PRL 117, 037207 (2016); [2] Kaluarachchi et al., Nat. Commun. 8, 546 (2017).
*This work was carried out at Iowa State University and supported by Ames Laboratory, US DOE, under Contract No. DE-AC02- 07CH11358. Parts of this work were supported by the Gordon and Betty Moore Foundation, the Keck foundation, DOE, NSF and the Swiss NSF.
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Presenters
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Elena Gati
- Iowa State University/ Ames Laboratory
- Ames Lab/Iowa State
- Ames Lab