Magnetothermodynamics of the Ising Antiferromagnet Dy2Ge2O7
X. Ke, M. L. Dahlberg, E. Morosan, J.A. Fleitman, R. J. Cava, and P., Schiffer
TL;DR
This study investigates the magnetic properties of Dy2Ge2O7, revealing its Ising antiferromagnetic behavior and spin freezing phenomena, similar to spin ice materials, through comprehensive low-temperature measurements.
Contribution
It provides the first detailed experimental characterization of Dy2Ge2O7's magnetothermodynamics, highlighting its Ising-like spins and spin freezing behavior.
Findings
Dy2Ge2O7 is confirmed as an anisotropic antiferromagnet.
Dy3+ ions behave as Ising-like spins similar to spin ice materials.
Spin freezing phenomena are observed, akin to those in spin ice systems.
Abstract
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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