Phase diagrams and ground-state magnetic properties of Pr-based filled skutterudites

Toshiro Sakakibara; Takashi Tayama; Jeroen Custers; Hidekazu Sato; Takahiro Onimaru; Hitoshi Sugawara; Yuji Aoki; Hideyuki Sato; S. R. Saha

doi:10.1016/j.physb.2005.01.245

Phase diagrams and ground-state magnetic properties of Pr-based filled skutterudites

Toshiro Sakakibara^*, Takashi Tayama, Jeroen Custers, Hidekazu Sato, Takahiro Onimaru, Hitoshi Sugawara, Yuji Aoki, Hideyuki Sato, S. R. Saha

^*Corresponding author for this work

Department of Physics

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

7 Scopus citations

Abstract

Phase diagrams and the ground-state magnetic properties of PrOs4Sb12, PrRu4P12 and PrFe4P12 are studied by means of low-temperature magnetization and specific heat measurements. Field-induced ordering observed in PrOs4Sb12 for all directions above 4.5 T is well explained by a level crossing in the Γ1-Γ4(Th) pseudo-quartet states with inclusion of an antiferroquadrupolar (AFQ) interaction. In PrRu4P12, a Curie-like increase of the susceptibility observed down to below 300 mK indicates that a half of Pr3+ ions have the magnetic Γ4(Th) triplet ground state, in accordance with a dramatic change in the crystal field splitting below the metal-insulator transition at 63 K recently observed by an inelastic neutron scattering experiment. In PrFe4P12, a new ordered phase is observed for H(∥[111])>7.5 T above the AFQ phase below 0.6 K, which is probably responsible for unusual heavy electron behavior observed in this field direction.

Original language	English
Pages (from-to)	836-843
Number of pages	8
Journal	Physica B: Condensed Matter
Volume	359-361
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physb.2005.01.245
State	Published - 2005/04/30

Keywords

Quadrupolar ordering
Skutterudite
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/j.physb.2005.01.245

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@article{0738c07fa581433e922ebdeeebe78a15,

title = "Phase diagrams and ground-state magnetic properties of Pr-based filled skutterudites",

abstract = "Phase diagrams and the ground-state magnetic properties of PrOs4Sb12, PrRu4P12 and PrFe4P12 are studied by means of low-temperature magnetization and specific heat measurements. Field-induced ordering observed in PrOs4Sb12 for all directions above 4.5 T is well explained by a level crossing in the Γ1-Γ4(Th) pseudo-quartet states with inclusion of an antiferroquadrupolar (AFQ) interaction. In PrRu4P12, a Curie-like increase of the susceptibility observed down to below 300 mK indicates that a half of Pr3+ ions have the magnetic Γ4(Th) triplet ground state, in accordance with a dramatic change in the crystal field splitting below the metal-insulator transition at 63 K recently observed by an inelastic neutron scattering experiment. In PrFe4P12, a new ordered phase is observed for H(∥[111])>7.5 T above the AFQ phase below 0.6 K, which is probably responsible for unusual heavy electron behavior observed in this field direction.",

keywords = "Quadrupolar ordering, Skutterudite, Superconductivity",

author = "Toshiro Sakakibara and Takashi Tayama and Jeroen Custers and Hidekazu Sato and Takahiro Onimaru and Hitoshi Sugawara and Yuji Aoki and Hideyuki Sato and Saha, {S. R.}",

note = "Funding Information: The authors would like to thank K. Iwasa, H. Harima and K. Matsuhira for useful discussions. The work has been supported by a Grant-in-Aid for Scientific Research Priority Area “Skutterudite” (No. 15072203) of MEXT, Japan. J.C. is supported by the JSPS Postdoctoral Fellowship for Foreign Researchers.",

year = "2005",

month = apr,

day = "30",

doi = "10.1016/j.physb.2005.01.245",

language = "英語",

volume = "359-361",

pages = "836--843",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

number = "SPEC. ISS.",

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TY - JOUR

T1 - Phase diagrams and ground-state magnetic properties of Pr-based filled skutterudites

AU - Sakakibara, Toshiro

AU - Tayama, Takashi

AU - Custers, Jeroen

AU - Sato, Hidekazu

AU - Onimaru, Takahiro

AU - Sugawara, Hitoshi

AU - Aoki, Yuji

AU - Sato, Hideyuki

AU - Saha, S. R.

N1 - Funding Information: The authors would like to thank K. Iwasa, H. Harima and K. Matsuhira for useful discussions. The work has been supported by a Grant-in-Aid for Scientific Research Priority Area “Skutterudite” (No. 15072203) of MEXT, Japan. J.C. is supported by the JSPS Postdoctoral Fellowship for Foreign Researchers.

PY - 2005/4/30

Y1 - 2005/4/30

N2 - Phase diagrams and the ground-state magnetic properties of PrOs4Sb12, PrRu4P12 and PrFe4P12 are studied by means of low-temperature magnetization and specific heat measurements. Field-induced ordering observed in PrOs4Sb12 for all directions above 4.5 T is well explained by a level crossing in the Γ1-Γ4(Th) pseudo-quartet states with inclusion of an antiferroquadrupolar (AFQ) interaction. In PrRu4P12, a Curie-like increase of the susceptibility observed down to below 300 mK indicates that a half of Pr3+ ions have the magnetic Γ4(Th) triplet ground state, in accordance with a dramatic change in the crystal field splitting below the metal-insulator transition at 63 K recently observed by an inelastic neutron scattering experiment. In PrFe4P12, a new ordered phase is observed for H(∥[111])>7.5 T above the AFQ phase below 0.6 K, which is probably responsible for unusual heavy electron behavior observed in this field direction.

AB - Phase diagrams and the ground-state magnetic properties of PrOs4Sb12, PrRu4P12 and PrFe4P12 are studied by means of low-temperature magnetization and specific heat measurements. Field-induced ordering observed in PrOs4Sb12 for all directions above 4.5 T is well explained by a level crossing in the Γ1-Γ4(Th) pseudo-quartet states with inclusion of an antiferroquadrupolar (AFQ) interaction. In PrRu4P12, a Curie-like increase of the susceptibility observed down to below 300 mK indicates that a half of Pr3+ ions have the magnetic Γ4(Th) triplet ground state, in accordance with a dramatic change in the crystal field splitting below the metal-insulator transition at 63 K recently observed by an inelastic neutron scattering experiment. In PrFe4P12, a new ordered phase is observed for H(∥[111])>7.5 T above the AFQ phase below 0.6 K, which is probably responsible for unusual heavy electron behavior observed in this field direction.

KW - Quadrupolar ordering

KW - Skutterudite

KW - Superconductivity

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JF - Physica B: Condensed Matter

IS - SPEC. ISS.

ER -

Phase diagrams and ground-state magnetic properties of Pr-based filled skutterudites

Abstract

Keywords

ASJC Scopus subject areas

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