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Title: Ferromagnetic quantum critical point avoided by the appearance of another magnetic phase in LaCrGe 3 under pressure

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [1];  [2];  [3];  [4];  [4];  [5];  [1];  [5];  [5];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. STFC Rutherford Appleton Lab., Oxfordshire (United Kingdom)
  4. Parco Area delle Scienze, Parma (Italy)
  5. Iowa State Univ., Ames, IA (United States)

Here, 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.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358; FA9550-09-1-0603
OSTI ID:
1321914
Alternate ID(s):
OSTI ID: 1262444
Report Number(s):
IS-J-9021; PRLTAO
Journal Information:
Physical Review Letters, Vol. 117, Issue 3; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (5)

Quantum tricritical points in NbFe2 journal September 2017
Tricritical wings and modulated magnetic phases in LaCrGe3 under pressure journal September 2017
New materials physics journal November 2019
Microscopic mechanism for the unusual antiferromagnetic order and the pressure-induced transition to ferromagnetism in USb 2 journal January 2018
Quantum tricritical points in NbFe2 text January 2018

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