Structure and magnetic properties of the Ho2 Ge2 O7 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

doi:10.1103/PhysRevB.77.224423

Structure and magnetic properties of the Ho2 Ge2 O7 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

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Abstract

We report the anisotropic magnetic properties of Ho2 Ge2 O7 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 μB. 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 is seen in the spin ice pyrochlore system Ho2 Ti2 O7.

Original language	English (US)
Article number	224423
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	77
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.77.224423
State	Published - Jun 16 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.77.224423

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title = "Structure and magnetic properties of the Ho2 Ge2 O7 pyrogermanate",

abstract = "We report the anisotropic magnetic properties of Ho2 Ge2 O7 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 μB. 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 is seen in the spin ice pyrochlore system Ho2 Ti2 O7.",

author = "E. Morosan and Fleitman, {J. A.} and Q. Huang and Lynn, {J. W.} and Y. Chen and X. Ke and Dahlberg, {M. L.} and P. Schiffer and Craley, {C. R.} and Cava, {R. J.}",

year = "2008",

month = jun,

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doi = "10.1103/PhysRevB.77.224423",

language = "English (US)",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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TY - JOUR

T1 - Structure and magnetic properties of the Ho2 Ge2 O7 pyrogermanate

AU - Morosan, E.

AU - Fleitman, J. A.

AU - Huang, Q.

AU - Lynn, J. W.

AU - Chen, Y.

AU - Ke, X.

AU - Dahlberg, M. L.

AU - Schiffer, P.

AU - Craley, C. R.

AU - Cava, R. J.

PY - 2008/6/16

Y1 - 2008/6/16

N2 - We report the anisotropic magnetic properties of Ho2 Ge2 O7 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 μB. 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 is seen in the spin ice pyrochlore system Ho2 Ti2 O7.

AB - We report the anisotropic magnetic properties of Ho2 Ge2 O7 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 μB. 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 is seen in the spin ice pyrochlore system Ho2 Ti2 O7.

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JF - Physical Review B - Condensed Matter and Materials Physics

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M1 - 224423

ER -

Structure and magnetic properties of the Ho2 Ge2 O7 pyrogermanate

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