Antiferromagnetic and orbital ordering on a diamond lattice near quantum criticality

K. W. Plumb; J. R. Morey; J. A. Rodriguez-Rivera; Hui Wu; A. A. Podlesnyak; T. M. McQueen; C. L. Broholm

doi:10.1103/PhysRevX.6.041055

Antiferromagnetic and orbital ordering on a diamond lattice near quantum criticality

K. W. Plumb, J. R. Morey, J. A. Rodriguez-Rivera, Hui Wu, A. A. Podlesnyak, T. M. McQueen, C. L. Broholm

Direct Geometry

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Abstract

We present neutron scattering measurements on powder samples of the spinel FeSc2S4 that reveal a previously unobserved magnetic ordering transition occurring at 11.8(2) K. Magnetic ordering occurs subsequent to a subtle cubic-to-tetragonal structural transition that distorts Fe coordinating sulfur tetrahedra and lifts the orbital degeneracy. The orbital ordering is not truly long ranged, but occurs over finite-sized domains that limit magnetic correlation lengths. The application of 1 GPa hydrostatic pressure appears to destabilize this Néel state, reducing the transition temperature to 8.6(8) K and redistributing magnetic spectral weight to higher energies. The relative magnitudes of ordered 〈m〉² = 3.1(2) μ_B² B and fluctuating moments 〈δm〉 1/4 13(1)μ_B²B show that the magnetically ordered state of FeSc2S4 is drastically renormalized and close to criticality.

Original language	English
Article number	041055
Journal	Physical Review X
Volume	6
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevX.6.041055
State	Published - 2016

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title = "Antiferromagnetic and orbital ordering on a diamond lattice near quantum criticality",

abstract = "We present neutron scattering measurements on powder samples of the spinel FeSc2S4 that reveal a previously unobserved magnetic ordering transition occurring at 11.8(2) K. Magnetic ordering occurs subsequent to a subtle cubic-to-tetragonal structural transition that distorts Fe coordinating sulfur tetrahedra and lifts the orbital degeneracy. The orbital ordering is not truly long ranged, but occurs over finite-sized domains that limit magnetic correlation lengths. The application of 1 GPa hydrostatic pressure appears to destabilize this N{\'e}el state, reducing the transition temperature to 8.6(8) K and redistributing magnetic spectral weight to higher energies. The relative magnitudes of ordered 〈m〉2 = 3.1(2) μB2 B and fluctuating moments 〈δm〉 1/4 13(1)μB2B show that the magnetically ordered state of FeSc2S4 is drastically renormalized and close to criticality.",

author = "Plumb, {K. W.} and Morey, {J. R.} and Rodriguez-Rivera, {J. A.} and Hui Wu and Podlesnyak, {A. A.} and McQueen, {T. M.} and Broholm, {C. L.}",

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T1 - Antiferromagnetic and orbital ordering on a diamond lattice near quantum criticality

AU - Plumb, K. W.

AU - Morey, J. R.

AU - Rodriguez-Rivera, J. A.

AU - Wu, Hui

AU - Podlesnyak, A. A.

AU - McQueen, T. M.

AU - Broholm, C. L.

PY - 2016

Y1 - 2016

N2 - We present neutron scattering measurements on powder samples of the spinel FeSc2S4 that reveal a previously unobserved magnetic ordering transition occurring at 11.8(2) K. Magnetic ordering occurs subsequent to a subtle cubic-to-tetragonal structural transition that distorts Fe coordinating sulfur tetrahedra and lifts the orbital degeneracy. The orbital ordering is not truly long ranged, but occurs over finite-sized domains that limit magnetic correlation lengths. The application of 1 GPa hydrostatic pressure appears to destabilize this Néel state, reducing the transition temperature to 8.6(8) K and redistributing magnetic spectral weight to higher energies. The relative magnitudes of ordered 〈m〉2 = 3.1(2) μB2 B and fluctuating moments 〈δm〉 1/4 13(1)μB2B show that the magnetically ordered state of FeSc2S4 is drastically renormalized and close to criticality.

AB - We present neutron scattering measurements on powder samples of the spinel FeSc2S4 that reveal a previously unobserved magnetic ordering transition occurring at 11.8(2) K. Magnetic ordering occurs subsequent to a subtle cubic-to-tetragonal structural transition that distorts Fe coordinating sulfur tetrahedra and lifts the orbital degeneracy. The orbital ordering is not truly long ranged, but occurs over finite-sized domains that limit magnetic correlation lengths. The application of 1 GPa hydrostatic pressure appears to destabilize this Néel state, reducing the transition temperature to 8.6(8) K and redistributing magnetic spectral weight to higher energies. The relative magnitudes of ordered 〈m〉2 = 3.1(2) μB2 B and fluctuating moments 〈δm〉 1/4 13(1)μB2B show that the magnetically ordered state of FeSc2S4 is drastically renormalized and close to criticality.

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Antiferromagnetic and orbital ordering on a diamond lattice near quantum criticality

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