Pressure-Induced Release of Magnetic Frustration in a Quasi-Kagome Antiferromagnet YbAgGe(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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 * , 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.

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