Successive magnetic transitions in a frustrated compound YbAgGe

Kazunori Umeo; Kyoutarou Yamane; Yuji Muro; Kenichi Katoh; Yuzuru Niide; Akira Ochiai; Takaaki Morie; Toshiro Sakakibara; Toshiro Takabatake

doi:10.1143/JPSJ.73.537

Successive magnetic transitions in a frustrated compound YbAgGe

Kazunori Umeo, Kyoutarou Yamane, Yuji Muro, Kenichi Katoh, Yuzuru Niide, Akira Ochiai, Takaaki Morie, Toshiro Sakakibara, Toshiro Takabatake

SCI - Physics

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

38 Citations (Scopus)

Abstract

Low-temperature properties of a heavy fermion compound YbAgGe have been investigated by electrical resistivity, specific heat and magnetization measurements on a single crystalline sample. This compound, crystallizing in the hexagonal ZrNiAl-type structure, undergoes two magnetic phase transitions at T_MI = 0.8 K (second order) and T_M2 = 0.65 K (first order). Below T_M2, the jump of the resistivity along the a axis indicates gap formation on the Fermi surface along the a axis. The extremely small magnetic entropy of 0.6 J/mol K released at T_MI is attributed to the combination of the Kondo effect and magnetic frustration effect. When the magnetic field B ∥ a is increased to 5 T, T_MI is depressed to 0 K. At this critical magnetic field, the magnetic susceptibility χ follows the Curie-Weiss law, χ^-1 - χ₀^-1 ∝ T, in a wide temperature range from 0.45 K to 300 K.

Original language	English
Pages (from-to)	537-540
Number of pages	4
Journal	journal of the physical society of japan
Volume	73
Issue number	3
DOIs	https://doi.org/10.1143/JPSJ.73.537
Publication status	Published - 2004 Mar 1

Keywords

Geometrical frustration
Heavy fermion compound
Magnetic transition
YbAgGe

ASJC Scopus subject areas

Physics and Astronomy(all)

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Successive magnetic transitions in a frustrated compound YbAgGe. / Umeo, Kazunori; Yamane, Kyoutarou; Muro, Yuji; Katoh, Kenichi; Niide, Yuzuru; Ochiai, Akira; Morie, Takaaki; Sakakibara, Toshiro; Takabatake, Toshiro.

In: journal of the physical society of japan, Vol. 73, No. 3, 01.03.2004, p. 537-540.

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

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abstract = "Low-temperature properties of a heavy fermion compound YbAgGe have been investigated by electrical resistivity, specific heat and magnetization measurements on a single crystalline sample. This compound, crystallizing in the hexagonal ZrNiAl-type structure, undergoes two magnetic phase transitions at TMI = 0.8 K (second order) and TM2 = 0.65 K (first order). Below TM2, the jump of the resistivity along the a axis indicates gap formation on the Fermi surface along the a axis. The extremely small magnetic entropy of 0.6 J/mol K released at TMI is attributed to the combination of the Kondo effect and magnetic frustration effect. When the magnetic field B ∥ a is increased to 5 T, TMI is depressed to 0 K. At this critical magnetic field, the magnetic susceptibility χ follows the Curie-Weiss law, χ-1 - χ0-1 ∝ T, in a wide temperature range from 0.45 K to 300 K.",

keywords = "Geometrical frustration, Heavy fermion compound, Magnetic transition, YbAgGe",

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AU - Umeo, Kazunori

AU - Yamane, Kyoutarou

AU - Muro, Yuji

AU - Katoh, Kenichi

AU - Niide, Yuzuru

AU - Ochiai, Akira

AU - Morie, Takaaki

AU - Sakakibara, Toshiro

AU - Takabatake, Toshiro

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N2 - Low-temperature properties of a heavy fermion compound YbAgGe have been investigated by electrical resistivity, specific heat and magnetization measurements on a single crystalline sample. This compound, crystallizing in the hexagonal ZrNiAl-type structure, undergoes two magnetic phase transitions at TMI = 0.8 K (second order) and TM2 = 0.65 K (first order). Below TM2, the jump of the resistivity along the a axis indicates gap formation on the Fermi surface along the a axis. The extremely small magnetic entropy of 0.6 J/mol K released at TMI is attributed to the combination of the Kondo effect and magnetic frustration effect. When the magnetic field B ∥ a is increased to 5 T, TMI is depressed to 0 K. At this critical magnetic field, the magnetic susceptibility χ follows the Curie-Weiss law, χ-1 - χ0-1 ∝ T, in a wide temperature range from 0.45 K to 300 K.

AB - Low-temperature properties of a heavy fermion compound YbAgGe have been investigated by electrical resistivity, specific heat and magnetization measurements on a single crystalline sample. This compound, crystallizing in the hexagonal ZrNiAl-type structure, undergoes two magnetic phase transitions at TMI = 0.8 K (second order) and TM2 = 0.65 K (first order). Below TM2, the jump of the resistivity along the a axis indicates gap formation on the Fermi surface along the a axis. The extremely small magnetic entropy of 0.6 J/mol K released at TMI is attributed to the combination of the Kondo effect and magnetic frustration effect. When the magnetic field B ∥ a is increased to 5 T, TMI is depressed to 0 K. At this critical magnetic field, the magnetic susceptibility χ follows the Curie-Weiss law, χ-1 - χ0-1 ∝ T, in a wide temperature range from 0.45 K to 300 K.

KW - Geometrical frustration

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KW - Magnetic transition

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