Pressure-Induced Release of Magnetic Frustration in a Quasi-Kagome Antiferromagnet YbAgGe

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  • Kubo Hirokazu
    Department of Quantum Matter, Graduate School of Advanced Sciences of Matter, Hiroshima University
  • Umeo Kazunori
    Department of Quantum Matter, Graduate School of Advanced Sciences of Matter, Hiroshima University Cryogenics and Instrumental Analysis Division, N-BARD, Hiroshima University
  • Katoh Kenichi
    Department of Applied Physics, National Defense Academy
  • Ochiai Akira
    Department of Physics, Graduate School of Science, Tohoku University
  • Takabatake Toshiro
    Department of Quantum Matter, Graduate School of Advanced Sciences of Matter, Hiroshima University Institute for Advanced Materials Research, Hiroshima University

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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.

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