Pressure-induced release of magnetic frustration in a quasi-Kagome antiferromagnet YbAgGe

Hirokazu Kubo; Kazunori Umeo; Kenichi Katoh; Akira Ochiai; Toshiro Takabatake

doi:10.1143/JPSJ.77.023704

Pressure-induced release of magnetic frustration in a quasi-Kagome antiferromagnet YbAgGe

Hirokazu Kubo, Kazunori Umeo, Kenichi Katoh, Akira Ochiai, Toshiro Takabatake

SCI - Physics

Research output: Contribution to journal › Article

11 Citations (Scopus)

Abstract

We report on specific-heat measurements under various pressures up to 3.2 GPa for a heavy-fermion antiferromagnet YbAgGe with a quasi-kagome lattice of Yb ions. For 0.5 < P < P* = 1.6 GPa, the magnetic transition temperature T_M remains constant at 0.85 K, while above P* the T_M increases linearly with a slope of 0.52 K/GPa. Concomitantly, the specific-heat anomaly at T_M converts from a first-order type sharp peak to a second-order type jump. The magnetic entropy at T_M rises for P > P*, whereas the Kondo temperature T_K does not change, contrary to the behavior expected from the Doniach phase diagram. These findings suggest that the sudden rise of T_M(P) for P > P* is not due to the lowering of T_K but the release of the magnetic frustration.

Original language	English
Article number	023704
Journal	journal of the physical society of japan
Volume	77
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.77.023704
Publication status	Published - 2008 Feb 1

Keywords

Heavy fermion
Kondo effect
Magnetic frustration
Pressure
YbAgGe

ASJC Scopus subject areas

Physics and Astronomy(all)

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Kubo, H., Umeo, K., Katoh, K., Ochiai, A., & Takabatake, T. (2008). Pressure-induced release of magnetic frustration in a quasi-Kagome antiferromagnet YbAgGe. journal of the physical society of japan, 77(2), [023704]. https://doi.org/10.1143/JPSJ.77.023704

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abstract = "We report on specific-heat measurements under various pressures up to 3.2 GPa for a heavy-fermion antiferromagnet YbAgGe with a quasi-kagome lattice of Yb ions. For 0.5 < P < P* = 1.6 GPa, the magnetic transition temperature TM remains constant at 0.85 K, while above P* the TM increases linearly with a slope of 0.52 K/GPa. Concomitantly, the specific-heat anomaly at TM converts from a first-order type sharp peak to a second-order type jump. The magnetic entropy at TM rises for P > P*, whereas the Kondo temperature TK does not change, contrary to the behavior expected from the Doniach phase diagram. These findings suggest that the sudden rise of TM(P) for P > P* is not due to the lowering of TK but the release of the magnetic frustration.",

keywords = "Heavy fermion, Kondo effect, Magnetic frustration, Pressure, YbAgGe",

author = "Hirokazu Kubo and Kazunori Umeo and Kenichi Katoh and Akira Ochiai and Toshiro Takabatake",

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AU - Kubo, Hirokazu

AU - Umeo, Kazunori

AU - Katoh, Kenichi

AU - Ochiai, Akira

AU - Takabatake, Toshiro

PY - 2008/2/1

Y1 - 2008/2/1

N2 - We report on specific-heat measurements under various pressures up to 3.2 GPa for a heavy-fermion antiferromagnet YbAgGe with a quasi-kagome lattice of Yb ions. For 0.5 < P < P* = 1.6 GPa, the magnetic transition temperature TM remains constant at 0.85 K, while above P* the TM increases linearly with a slope of 0.52 K/GPa. Concomitantly, the specific-heat anomaly at TM converts from a first-order type sharp peak to a second-order type jump. The magnetic entropy at TM rises for P > P*, whereas the Kondo temperature TK does not change, contrary to the behavior expected from the Doniach phase diagram. These findings suggest that the sudden rise of TM(P) for P > P* is not due to the lowering of TK but the release of the magnetic frustration.

AB - We report on specific-heat measurements under various pressures up to 3.2 GPa for a heavy-fermion antiferromagnet YbAgGe with a quasi-kagome lattice of Yb ions. For 0.5 < P < P* = 1.6 GPa, the magnetic transition temperature TM remains constant at 0.85 K, while above P* the TM increases linearly with a slope of 0.52 K/GPa. Concomitantly, the specific-heat anomaly at TM converts from a first-order type sharp peak to a second-order type jump. The magnetic entropy at TM rises for P > P*, whereas the Kondo temperature TK does not change, contrary to the behavior expected from the Doniach phase diagram. These findings suggest that the sudden rise of TM(P) for P > P* is not due to the lowering of TK but the release of the magnetic frustration.

KW - Heavy fermion

KW - Kondo effect

KW - Magnetic frustration

KW - Pressure

KW - YbAgGe

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