Inelastic neutron scattering study of crystal field excitations of Nd3+ in NdFeAsO

Y Xiao; M Zbiri; Ruth Amy Downie; Jan-Willem G Bos; Th Brückel; T Chatterji

doi:10.1103/PhysRevB.88.214419

Inelastic neutron scattering study of crystal field excitations of Nd³⁺ in NdFeAsO

Y Xiao, M Zbiri, Ruth Amy Downie, Jan-Willem G Bos, Th Brückel, T Chatterji

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Abstract

Inelastic neutron scattering experiments were performed to investigate the crystalline electric field (CEF) excitations of Nd3+ (J = 9/2) in the iron pnictide NdFeAsO. The crystal field level structures for both the high-temperature paramagnetic phase and the low-temperature antiferromagnetic phase of NdFeAsO are constructed. The variation of CEF excitations of Nd3+ reflects not only the change of local symmetry but also the change of magnetic ordered state of the Fe sublattice. By analyzing the crystal field interaction with a crystal field Hamiltonian, the crystal field parameters are obtained. It was found that the sign of the fourth-and sixth-order crystal field parameters change upon the magnetic phase transition at similar to 140 K, which may be due to the variation of exchange interactions between the 4f and conduction electrons.

Original language	English
Article number	214419
Number of pages	6
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	88
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.88.214419
Publication status	Published - 1 Dec 2013

Keywords

LAYERED QUATERNARY COMPOUND
CONDUCTION ELECTRONS
COULOMBIC PART
SUPERCONDUCTIVITY

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10.1103/PhysRevB.88.214419

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title = "Inelastic neutron scattering study of crystal field excitations of Nd3+ in NdFeAsO",

abstract = "Inelastic neutron scattering experiments were performed to investigate the crystalline electric field (CEF) excitations of Nd3+ (J = 9/2) in the iron pnictide NdFeAsO. The crystal field level structures for both the high-temperature paramagnetic phase and the low-temperature antiferromagnetic phase of NdFeAsO are constructed. The variation of CEF excitations of Nd3+ reflects not only the change of local symmetry but also the change of magnetic ordered state of the Fe sublattice. By analyzing the crystal field interaction with a crystal field Hamiltonian, the crystal field parameters are obtained. It was found that the sign of the fourth-and sixth-order crystal field parameters change upon the magnetic phase transition at similar to 140 K, which may be due to the variation of exchange interactions between the 4f and conduction electrons.",

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author = "Y Xiao and M Zbiri and Downie, {Ruth Amy} and Bos, {Jan-Willem G} and Th Br{\"u}ckel and T Chatterji",

year = "2013",

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doi = "10.1103/PhysRevB.88.214419",

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T1 - Inelastic neutron scattering study of crystal field excitations of Nd3+ in NdFeAsO

AU - Xiao, Y

AU - Zbiri, M

AU - Downie, Ruth Amy

AU - Bos, Jan-Willem G

AU - Brückel, Th

AU - Chatterji, T

PY - 2013/12/1

Y1 - 2013/12/1

N2 - Inelastic neutron scattering experiments were performed to investigate the crystalline electric field (CEF) excitations of Nd3+ (J = 9/2) in the iron pnictide NdFeAsO. The crystal field level structures for both the high-temperature paramagnetic phase and the low-temperature antiferromagnetic phase of NdFeAsO are constructed. The variation of CEF excitations of Nd3+ reflects not only the change of local symmetry but also the change of magnetic ordered state of the Fe sublattice. By analyzing the crystal field interaction with a crystal field Hamiltonian, the crystal field parameters are obtained. It was found that the sign of the fourth-and sixth-order crystal field parameters change upon the magnetic phase transition at similar to 140 K, which may be due to the variation of exchange interactions between the 4f and conduction electrons.

AB - Inelastic neutron scattering experiments were performed to investigate the crystalline electric field (CEF) excitations of Nd3+ (J = 9/2) in the iron pnictide NdFeAsO. The crystal field level structures for both the high-temperature paramagnetic phase and the low-temperature antiferromagnetic phase of NdFeAsO are constructed. The variation of CEF excitations of Nd3+ reflects not only the change of local symmetry but also the change of magnetic ordered state of the Fe sublattice. By analyzing the crystal field interaction with a crystal field Hamiltonian, the crystal field parameters are obtained. It was found that the sign of the fourth-and sixth-order crystal field parameters change upon the magnetic phase transition at similar to 140 K, which may be due to the variation of exchange interactions between the 4f and conduction electrons.

KW - LAYERED QUATERNARY COMPOUND

KW - CONDUCTION ELECTRONS

KW - COULOMBIC PART

KW - SUPERCONDUCTIVITY

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DO - 10.1103/PhysRevB.88.214419

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