dorsal/arxiv
View SchemaNeutron Scattering Study of Crystal Field Energy Levels and Field Dependence of the Magnetic Order in Superconducting HoNi2B2C
| Authors | T. E. Grigereit, J. W. Lynn, R. J. Cava, J. J. Krajewski, W. F. Peck, Jr. |
|---|---|
| Categories | |
| ArXiv ID | supr-con/9505002 |
| URL | https://arxiv.org/abs/supr-con/9505002 |
| DOI | 10.1016/0921-4534(95)00312-6 |
Abstract
Elastic and inelastic neutron scattering measurements have been carried out to investigate the magnetic properties of superconducting (Tc~8K) HoNi2B2C. The inelastic measurements reveal that the lowest two crystal field transitions out of the ground state occurat 11.28(3) and 16.00(2) meV, while the transition of 4.70(9) meV between these two levels is observed at elevated temperatures. The temperature dependence of the intensities of these transitions is consistent with both the ground state and these higher levels being magnetic doublets. The system becomes magnetically long range ordered below 8K, and since this ordering energy kTN ~ 0.69meV << 11.28meV the magnetic properties in the ordered phase are dominated by the ground-state spin dynamics only. The low temperature structure, which coexists with superconductivity, consists of ferromagnetic sheets of Ho{3+ moments in the a-b plane, with the sheets coupled antiferromagnetically along the c-axis. The magnetic state that initially forms on cooling, however, is dominated by an incommensurate spiral antiferromagnetic state along the c-axis, with wave vector qc ~0.054 A-1, in which these ferromagnetic sheets are canted from their low temperature antiparallel configuration by ~17 deg. The intensity for this spiral state reaches a maximum near the reentrant superconducting transition at ~5K; the spiral state then collapses at lower temperature in favor of the commensurate antiferromagnetic state. We have investigated the field dependence of the magnetic order at and above this reentrant superconducting transition. Initially the field rotates the powder particles to align the a-b plane along the field direction, demonstrating that the moments strongly prefer to lie within this plane due to the crystal field anisotropy. Upon subsequently increasing the field at
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"abstract": "Elastic and inelastic neutron scattering measurements have been carried out\nto investigate the magnetic properties of superconducting (Tc~8K) HoNi2B2C. The\ninelastic measurements reveal that the lowest two crystal field transitions out\nof the ground state occurat 11.28(3) and 16.00(2) meV, while the transition of\n4.70(9) meV between these two levels is observed at elevated temperatures. The\ntemperature dependence of the intensities of these transitions is consistent\nwith both the ground state and these higher levels being magnetic doublets. The\nsystem becomes magnetically long range ordered below 8K, and since this\nordering energy kTN ~ 0.69meV \u003c\u003c 11.28meV the magnetic properties in the\nordered phase are dominated by the ground-state spin dynamics only. The low\ntemperature structure, which coexists with superconductivity, consists of\nferromagnetic sheets of Ho{3+ moments in the a-b plane, with the sheets coupled\nantiferromagnetically along the c-axis. The magnetic state that initially forms\non cooling, however, is dominated by an incommensurate spiral antiferromagnetic\nstate along the c-axis, with wave vector qc ~0.054 A-1, in which these\nferromagnetic sheets are canted from their low temperature antiparallel\nconfiguration by ~17 deg. The intensity for this spiral state reaches a maximum\nnear the reentrant superconducting transition at ~5K; the spiral state then\ncollapses at lower temperature in favor of the commensurate antiferromagnetic\nstate. We have investigated the field dependence of the magnetic order at and\nabove this reentrant superconducting transition. Initially the field rotates\nthe powder particles to align the a-b plane along the field direction,\ndemonstrating that the moments strongly prefer to lie within this plane due to\nthe crystal field anisotropy. Upon subsequently increasing the field at",
"arxiv_id": "supr-con/9505002",
"authors": [
"T. E. Grigereit",
"J. W. Lynn",
"R. J. Cava",
"J. J. Krajewski",
"W. F. Peck, Jr."
],
"categories": [
"supr-con",
"cond-mat.supr-con"
],
"doi": "10.1016/0921-4534(95)00312-6",
"title": "Neutron Scattering Study of Crystal Field Energy Levels and Field Dependence of the Magnetic Order in Superconducting HoNi2B2C",
"url": "https://arxiv.org/abs/supr-con/9505002"
},
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