4.6 Article

Switching of magnetic ground states across the UIr1-xRhxGe alloy system

期刊

PHYSICAL REVIEW B
卷 95, 期 15, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.155138

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资金

  1. Japan Society for the Promotion of Science (JSPS) KAKENHI [15H05884, 16K05463, 15KK0149, 15K05156, JP15H05852]
  2. REIMEI Research Program of Japan Atomic Energy Agency (JAEA)
  3. [25400386]
  4. Grants-in-Aid for Scientific Research [15H05884, 15H05745, 16H04006, 16K05463, 15KK0149, 15K05156, 15KK0174] Funding Source: KAKEN

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We investigated the evolution ofmagnetism in the UIr1-xRhx Ge system by the systematic study of high-quality single crystals. Lattice parameters of both parent compounds are very similar, resulting in almost identical nearest interatomic uranium distances close to the Hill limit. We established the x-T phase diagram of the UIr1-xRhx Ge system and found a discontinuous antiferromagnetic/ferromagnetic boundary at x(crit) = 0.56, where a local minimum in ordering temperature andmaximum of the Sommerfeld coefficient gamma approximate to 175 mJ/molK(2) occurs in the UCoGe-URhGe-UIrGe system, signaling an increase in magnetic fluctuation. However, a quantum critical point is not realized because of the finite ordering temperature at x(crit). A magnon gap on the antiferromagnetic side abruptly suppresses magnetic fluctuations. We find a field-induced first order transition in the vicinity of the critical magnetic field along the b axis (H-b, crit) in the entire UIr1-xRhx Ge system, including the ferromagnetic region similar to UCo0.6Rh0.4Ge-URhGe.

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