Switching of magnetic ground states across the UI r1-x R hxGe alloy system

Jiří Pospíšil; Yoshinori Haga; Shinsaku Kambe; Yo Tokunaga; Naoyuki Tateiwa; Dai Aoki; Fuminori Honda; Ai Nakamura; Yoshiya Homma; Etsuji Yamamoto; Tomoo Yamamura

doi:10.1103/PhysRevB.95.155138

Switching of magnetic ground states across the UI r1-x R hxGe alloy system

Jiří Pospíšil, Yoshinori Haga, Shinsaku Kambe, Yo Tokunaga, Naoyuki Tateiwa, Dai Aoki, Fuminori Honda, Ai Nakamura, Yoshiya Homma, Etsuji Yamamoto, Tomoo Yamamura

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We investigated the evolution of magnetism in the UIr1-xRhxGe 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-xRhxGe system and found a discontinuous antiferromagnetic/ferromagnetic boundary at xcrit=0.56, where a local minimum in ordering temperature and maximum of the Sommerfeld coefficient γ≈175mJ/molK2 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 xcrit. 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 (Hb,crit) in the entire UIr1-xRhxGe system, including the ferromagnetic region ∼UCo0.6Rh0.4Ge-URhGe.

Original language	English
Article number	155138
Journal	Physical Review B
Volume	95
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevB.95.155138
Publication status	Published - Apr 24 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.95.155138

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@article{c79f0799ec37437488d398c2a6d8e4de,

title = "Switching of magnetic ground states across the UI r1-x R hxGe alloy system",

abstract = "We investigated the evolution of magnetism in the UIr1-xRhxGe 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-xRhxGe system and found a discontinuous antiferromagnetic/ferromagnetic boundary at xcrit=0.56, where a local minimum in ordering temperature and maximum of the Sommerfeld coefficient γ≈175mJ/molK2 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 xcrit. 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 (Hb,crit) in the entire UIr1-xRhxGe system, including the ferromagnetic region ∼UCo0.6Rh0.4Ge-URhGe.",

author = "Ji{\v r}{\'i} Posp{\'i}{\v s}il and Yoshinori Haga and Shinsaku Kambe and Yo Tokunaga and Naoyuki Tateiwa and Dai Aoki and Fuminori Honda and Ai Nakamura and Yoshiya Homma and Etsuji Yamamoto and Tomoo Yamamura",

note = "Funding Information: The authors thank Z. Fisk for fruitful discussion of the experimental data. This paper was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grants No. 15H05884 (J-Physics), No. 16K05463, No. 15KK0149, No. 15K05156, and No. JP15H05852 and the REIMEI Research Program of Japan Atomic Energy Agency (JAEA). This paper was also supported by a Grant-in-Aid for Scientific Research C (Grant No. 25400386). Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

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doi = "10.1103/PhysRevB.95.155138",

language = "English",

volume = "95",

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T1 - Switching of magnetic ground states across the UI r1-x R hxGe alloy system

AU - Pospíšil, Jiří

AU - Haga, Yoshinori

AU - Kambe, Shinsaku

AU - Tokunaga, Yo

AU - Tateiwa, Naoyuki

AU - Aoki, Dai

AU - Honda, Fuminori

AU - Nakamura, Ai

AU - Homma, Yoshiya

AU - Yamamoto, Etsuji

AU - Yamamura, Tomoo

N1 - Funding Information: The authors thank Z. Fisk for fruitful discussion of the experimental data. This paper was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grants No. 15H05884 (J-Physics), No. 16K05463, No. 15KK0149, No. 15K05156, and No. JP15H05852 and the REIMEI Research Program of Japan Atomic Energy Agency (JAEA). This paper was also supported by a Grant-in-Aid for Scientific Research C (Grant No. 25400386). Publisher Copyright: © 2017 American Physical Society.

PY - 2017/4/24

Y1 - 2017/4/24

N2 - We investigated the evolution of magnetism in the UIr1-xRhxGe 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-xRhxGe system and found a discontinuous antiferromagnetic/ferromagnetic boundary at xcrit=0.56, where a local minimum in ordering temperature and maximum of the Sommerfeld coefficient γ≈175mJ/molK2 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 xcrit. 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 (Hb,crit) in the entire UIr1-xRhxGe system, including the ferromagnetic region ∼UCo0.6Rh0.4Ge-URhGe.

AB - We investigated the evolution of magnetism in the UIr1-xRhxGe 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-xRhxGe system and found a discontinuous antiferromagnetic/ferromagnetic boundary at xcrit=0.56, where a local minimum in ordering temperature and maximum of the Sommerfeld coefficient γ≈175mJ/molK2 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 xcrit. 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 (Hb,crit) in the entire UIr1-xRhxGe system, including the ferromagnetic region ∼UCo0.6Rh0.4Ge-URhGe.

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ER -

Switching of magnetic ground states across the UI r1-x R hxGe alloy system

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