Structure and magnetic properties of the Ho2Ge2O7 pyrogermanate
E. Morosan, J. A. Fleitman, Q. Huang, J. W. Lynn, Y. Chen, X. Ke, M., L. Dahlberg, P. Schiffer, C. R. Craley, R. J. Cava
TL;DR
This study investigates the anisotropic magnetic properties and spin relaxation phenomena of Ho2Ge2O7, revealing a spiral magnetic structure, anisotropic crystal field effects, and magnetic ordering at 1.6 K.
Contribution
It provides the first detailed characterization of the magnetic structure and anisotropic properties of Ho2Ge2O7, including neutron diffraction refinement and spin relaxation behavior.
Findings
Magnetic structure is a right-handed spiral of Ho moments.
Magnetic ordering occurs around 1.6 K.
Displays spin relaxation phenomena similar to Ho2Ti2O7.
Abstract
We report the anisotropic magnetic properties of Ho2Ge2O7 determined from dc and ac magnetization, specific heat and powder neutron diffraction experiments. The magnetic lanthanide sublattice, seen in our refinement of the tetragonal pyrogermanate crystal structure, is a right-handed spiral of edge-sharing and corner-sharing triangles; the local Ho-O coordination indicates that the crystal field is anisotropic. Susceptibility and magnetization data indeed show that the magnetism is highly anisotropic, and the magnetic structure has the Ho moments confined to the plane perpendicular to the structural spiral. The ordered moment of Ho3+, as determined from refinement of the neutron diffraction data, is 9.0 mu_B. Magnetic ordering occurs around 1.6 K. Temperature and field dependent ac susceptibility measurements show that this compound displays spin relaxation phenomena analogous to what…
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