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Localized 4f States and Dynamic Jahn-Teller Effect in PrO2

Boothroyd, A.T., Gardiner, C.H., Lister, S.J.S., Santini, P., Rainford, B.D., Noailles, L.D., Currie, D.B., Eccleston, R.S. and Bewley, R.I. (2001) Localized 4f States and Dynamic Jahn-Teller Effect in PrO2. Physical Review Letters, 86(10), pp. 2082-2085. (doi: 10.1103/PhysRevLett.86.2082) (PMID:11289860)

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Abstract

Neutron spectroscopic measurements of the magnetic excitations in PrO 2 reveal (1) sharp peaks characteristic of transitions between levels of the 4 f 1 configuration of Pr 4 + split by the cubic crystal field, and (2) broad bands of scattering centered near 30 and 160 meV. We present a simple model based on a vibronic Hamiltonian that accounts for these contrasting features of the data. The analysis shows that 90 % ± 10 % of the Pr ions have a localized 4 f 1 configuration and provides strong evidence for a dynamic Jahn-Teller effect in the Γ 8 electronic ground state.

Item Type:	Articles
Status:	Published
Refereed:	Yes
Glasgow Author(s) Enlighten ID:	Webster, Dr Carol
Authors:	Boothroyd, A.T., Gardiner, C.H., Lister, S.J.S., Santini, P., Rainford, B.D., Noailles, L.D., Currie, D.B., Eccleston, R.S., and Bewley, R.I.
College/School:	College of Science and Engineering > School of Computing Science
Journal Name:	Physical Review Letters
Journal Abbr.:	Phys Rev Lett
Publisher:	American Physical Society
ISSN:	0031-9007
ISSN (Online):	1079-7114

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References

[1] I. B. Bersuker and V. Z. Polinger, Vibronic Interactions in Molecules and Crystals (Springer-Verlag, Berlin, 1989). [2] S. Kern et al., Solid State Commun. 49 , 295 (1984). The direction of the ordered moment is still not known. [3] A. Kotani et al., Adv. Phys. 37 , 37 (1988). [4] A. Bianconi et al., Phys. Rev. B 38 , 3433 (1988); H. Oga- sawara et al., Phys. Rev. B 43 , 854 (1991); S. Kimura et al., J. Electron Spectrosc. Relat. Phenom. 78 , 135 (1996); S. M. Butorin et al., J. Phys. Condens. Matter 9 , 8155 (1997). [5] E. Wuilloud et al., Phys. Rev. Lett. 53 , 202 (1984); F. Marabelli and P. Wachter, Phys. Rev. B 36 , 1238 (1987). [6] R. C. Karnatak et al., Phys. Rev. B 36 , 1745 (1987); H. Dexpert et al., Phys. Rev. B 36 , 1750 (1987). [7] R. Fehrenbacher and T. M. Rice, Phys. Rev. Lett. 70 , 3471 (1993). [8] U. Neukirch et al., Europhys. Lett. 5 , 567 (1988); F. W. Lytle et al., Phys. Rev. B 41 , 8955 (1990); Z. Hu et al., Phys. Rev. B 60 , 1460 (1999); U. Staub et al., Phys. Rev. B 61 , 1548 (2000). [9] E. Holland-Moritz, Z. Phys. B 89 , 285 (1992). [10] S. W. Lovesey, Theory of Neutron Scattering from Con- densed Matter (Oxford University Press, Oxford, U.K., 1984). [11] S. Kern et al., J. Appl. Phys. 67 , 4830 (1990). [12] V. Kaufman and J. Sugar, J. Res. Natl. Bur. Stand. 71A , 583 (1967). [13] S.Kern et al., Phys. Rev. B 32 , 3051 (1985). [14] The B kq and z coefficients used here are defined in W. T. Carnall et al., J. Chem. Phys. 90 , 3443 (1989). [15] P. J. Brown, in International Tables for X-ray Crystallog- raphy, edited by A. J. C. Wilson (Kluwer Academic, Dor- drecht, 1992), Vol. C ; W. B. Lewis, in Magnetic Resonance and Related Phenomena, Proceedings of the XVIth Con- gress AMPERE, Bucharest, 1970, edited by I. Ursu (Pub- lishing House of the Academy of the Socialist Republic of Romania, Bucharest, 1971), p. 717. [16] These are somewhat smaller than the corresponding values 192 and 118 mb^-1 sr^-1 Pr^-1 obtained when J mixing with the J = 7/2 multiplet is neglected. [17] A further ~16 mb sr^-1 Pr^-1 associated with elastic (Bragg) scattering from the ordered moment of ~0.50 Bohr microns at 10 K is not contained in the data in Fig. 1(d). [18] K. Sasaki and Y. Obata, J. Phys. Soc. Jpn. 28 , 1157 (1970). [19] J. Sugar, Phys. Rev. Lett. 14 , 731 (1965).

Deposit and Record Details

ID Code:	173799
Depositing User:	Dr Carol Webster
Datestamp:	21 Nov 2018 14:58
Last Modified:	22 Nov 2018 02:03
Date of acceptance:	5 March 2001
Date of first online publication:	5 March 2001