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Ferromagnetic Quantum Critical Point Avoided by the Appearance of Another Magnetic Phase in LaCrGe3 under Pressure

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Taufour Valentin, Kaluarachchi Udhara S., Khasanov Rustem, Nguyen Manh Cuong, Guguchia Zurab, Biswas Pabitra Kumar, Bonfa Pietro, De Renzi Roberto, Lin Xiao, Kim Stella K., Mun Eun Deok, Kim Hyunsoo, Furukawa Yuji, Wang Cai-Zhuang, Ho Kai-Ming, Bud'ko Sergey L., Canfield Paul C.,
Project Interplay between the superconductivity and magnetism in cuprate and Fe-based superconductors
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Original article (peer-reviewed)

Journal PHYSICAL REVIEW LETTERS
Volume (Issue) 117(3)
Page(s) 037207
Title of proceedings PHYSICAL REVIEW LETTERS
DOI 10.1103/physrevlett.117.037207

Abstract

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, AFM(Q). 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.
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