1980
DOI: 10.1016/0378-4363(80)90149-7
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Magnetic susceptibility and the phase transition of NpO2

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Cited by 69 publications
(57 citation statements)
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“…Instead, resonant X-ray scattering (RXS) measurements have been reported which suggest the occurrence of a longitudinal, triple-q, 5 AFQ structure in the ordered state [12]. Moreover, the AFQ order has been proposed to be a secondary order parameter in a transition driven by primary 5 antiferro-octupolar (AFO) order [12], since the AFQ order alone can not successfully explain the breaking of time reversal symmetry suggested by susceptibility [20] and SR [21] measurements. The longitudinal triple-q 5 AFO ordered ground state has also been corroborated by recent microscopic calculations based on the j-j coupling scheme [13,14].…”
Section: Npomentioning
confidence: 99%
“…Instead, resonant X-ray scattering (RXS) measurements have been reported which suggest the occurrence of a longitudinal, triple-q, 5 AFQ structure in the ordered state [12]. Moreover, the AFQ order has been proposed to be a secondary order parameter in a transition driven by primary 5 antiferro-octupolar (AFO) order [12], since the AFQ order alone can not successfully explain the breaking of time reversal symmetry suggested by susceptibility [20] and SR [21] measurements. The longitudinal triple-q 5 AFO ordered ground state has also been corroborated by recent microscopic calculations based on the j-j coupling scheme [13,14].…”
Section: Npomentioning
confidence: 99%
“…[1][2][3][4][5] Recently, resonant X-ray scattering measurements have revealed the occurrence of long-range antiferroquadrupolar (AFQ) ordering as a secondary order parameter below T N . 6) NpO 2 is known to exhibit a rather mysterious phase transition at T 0 = 26 K. The compound was thought for many years to be an antiferromagnet; [7][8][9][10] however, neither Mössbauer spectroscopy 11,12) nor neutron diffraction [13][14][15] detected any ordered moment below T 0 . It is now recognized that the phase transition originates from an octupole moment of Γ 5 symmetry (or other high-order multipoles with the same symmetry) allowed by the Γ 8 quartet CEF ground state of the Np 5f electrons.…”
mentioning
confidence: 99%
“…7,8 Several phenomenological works on the ordered phase have claimed a key role of octupole degree of freedom. 9,10,11,12,13 The CEF states of NpO 2 have been determined by neutron scattering experiment.…”
mentioning
confidence: 99%