Ferromagnetic Quantum Critical Point Avoided by the Appearance of Another Magnetic Phase in LaCrGe₃ under Pressure
The temperature-pressure phase diagram of the ferromagnet LaCrGe3 is determined for the first time from a combination of magnetization, muon-spin-rotation, and electrical resistivity measurements. The ferromagnetic phase is suppressed near 2.1 GPa, but quantum criticality is avoided by the appearance of a magnetic phase, likely modulated, AFMQ. Our density functional theory total energy calculations suggest a near degeneracy of antiferromagnetic states with small magnetic wave vectors Q allowing for the potential of an ordering wave vector evolving from Q = 0 to finite Q, as expected from the most recent theories on ferromagnetic quantum criticality. Our findings show that LaCrGe3 is a very simple example to study this scenario of avoided ferromagnetic quantum criticality and will inspire further study on this material and other itinerant ferromagnets.
V. Taufour and U. S. Kaluarachchi and R. Khasanov and M. C. Nguyen and Z. Guguchia and P. K. Biswas and P. Bonfà and R. De Renzi and X. Lin and For full list of authors, see publisher's website., "Ferromagnetic Quantum Critical Point Avoided by the Appearance of Another Magnetic Phase in LaCrGe₃ under Pressure," Physical Review Letters, vol. 117, no. 3, article no. 37207, American Physical Society (APS), Jul 2016.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.117.037207
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© 2016 American Physical Society (APS), All rights reserved.
13 Jul 2016
U.S. Department of Energy, Grant 149486