Magnetothermodynamics of the Ising Antiferromagnet Dy2Ge2O7

Details Magnetothermodynamics of the Ising Antiferromagnet Dy2Ge2O7 Magnetothermodynamics of the Ising Antiferromagnet Dy2Ge2O7

2008-08-26

arxiv.org/abs/0808.3596v1

Phys. Rev. B. 78, 104411 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Phys. Rev. B, in press (2008)

Scientific paper

10.1103/PhysRevB.78.104411

We report systematic low temperature measurements of the DC magnetization, AC susceptibility, and heat capacity of dysprosium pyrogermanate (Dy2Ge2O7) single crystal and powder samples. Our results confirm that Dy2Ge2O7 is an anisotropic antiferromagnet. The isothermal field dependent magnetization and the integrated magnetic entropy both indicate that the Dy3+ ions behave as Ising-like spins, analogous to those in the pyrochlore spin ice materials. Both single-spin and collective spin relaxation phenomena appear to lead to spin freezing in this material, again in analogy to observations in the spin ice materials, suggesting that such phenomena may be generic to a broader class of magnetic materials.

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