Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R=Gd, Ho, Er, Tm, and Yb)

P. Babkevich; A. Finco; Minki Jeong; B. Dalla Piazza; I. Kovacevic; G. Klughertz; K. W. Krämer; C. Kraemer; DT Adroja; E. Goremychkin; T. Unruh; T. Strässle; A. Di Lieto; H. M. Rønnow; Jens Bo Jensen

doi:10.1103/PhysRevB.92.144422

Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF₄ (R=Gd, Ho, Er, Tm, and Yb)

P. Babkevich, A. Finco, Minki Jeong, B. Dalla Piazza, I. Kovacevic, G. Klughertz, K. W. Krämer, C. Kraemer, DT Adroja, E. Goremychkin, T. Unruh, T. Strässle, A. Di Lieto, H. M. Rønnow, Jens Bo Jensen

Physics and Astronomy

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12 Citations (Scopus)

Abstract

We present a systematic study of the crystal-field interactions in the
LiRF₄ (R=Gd, Ho, Er, Tm, and Yb) family of rare-earth magnets. Using detailed inelastic neutron scattering measurements, we have been able to quantify the transition energies and wave functions for each system. This allows us to quantitatively describe the high-temperature susceptibility measurements for the series of materials and make predictions based on a mean-field approach for the low-temperature thermal and quantum phase transitions. We show that coupling between crystal field and phonon states leads to line-shape broadening in LiTmF₄ and level splitting in LiYbF₄. Furthermore, using high-resolution neutron scattering from LiHoF₄, we find anomalous broadening of crystal-field excitations which we attribute to magnetoelastic coupling.

Original language	English
Article number	144422
Number of pages	15
Journal	Physical Review B
Volume	92
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.92.144422
Publication status	Published - 23 Oct 2015

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Babkevich, P., Finco, A., Jeong, M., Piazza, B. D., Kovacevic, I., Klughertz, G., Krämer, K. W., Kraemer, C., Adroja, DT., Goremychkin, E., Unruh, T., Strässle, T., Di Lieto, A., Rønnow, H. M., & Jensen, J. B. (2015). Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF₄ (R=Gd, Ho, Er, Tm, and Yb). Physical Review B, 92(14), Article 144422. https://doi.org/10.1103/PhysRevB.92.144422

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title = "Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R=Gd, Ho, Er, Tm, and Yb)",

abstract = "We present a systematic study of the crystal-field interactions in the LiRF4 (R=Gd, Ho, Er, Tm, and Yb) family of rare-earth magnets. Using detailed inelastic neutron scattering measurements, we have been able to quantify the transition energies and wave functions for each system. This allows us to quantitatively describe the high-temperature susceptibility measurements for the series of materials and make predictions based on a mean-field approach for the low-temperature thermal and quantum phase transitions. We show that coupling between crystal field and phonon states leads to line-shape broadening in LiTmF4 and level splitting in LiYbF4. Furthermore, using high-resolution neutron scattering from LiHoF4, we find anomalous broadening of crystal-field excitations which we attribute to magnetoelastic coupling.",

author = "P. Babkevich and A. Finco and Minki Jeong and Piazza, {B. Dalla} and I. Kovacevic and G. Klughertz and Kr{\"a}mer, {K. W.} and C. Kraemer and DT Adroja and E. Goremychkin and T. Unruh and T. Str{\"a}ssle and {Di Lieto}, A. and R{\o}nnow, {H. M.} and Jensen, {Jens Bo}",

year = "2015",

month = oct,

day = "23",

doi = "10.1103/PhysRevB.92.144422",

language = "English",

volume = "92",

journal = "Physical Review B",

issn = "1098-0121",

publisher = "American Physical Society (APS)",

number = "14",

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Babkevich, P, Finco, A, Jeong, M, Piazza, BD, Kovacevic, I, Klughertz, G, Krämer, KW, Kraemer, C, Adroja, DT, Goremychkin, E, Unruh, T, Strässle, T, Di Lieto, A, Rønnow, HM & Jensen, JB 2015, 'Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF₄ (R=Gd, Ho, Er, Tm, and Yb)', Physical Review B, vol. 92, no. 14, 144422. https://doi.org/10.1103/PhysRevB.92.144422

TY - JOUR

T1 - Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R=Gd, Ho, Er, Tm, and Yb)

AU - Babkevich, P.

AU - Finco, A.

AU - Jeong, Minki

AU - Piazza, B. Dalla

AU - Kovacevic, I.

AU - Klughertz, G.

AU - Krämer, K. W.

AU - Kraemer, C.

AU - Adroja, DT

AU - Goremychkin, E.

AU - Unruh, T.

AU - Strässle, T.

AU - Di Lieto, A.

AU - Rønnow, H. M.

AU - Jensen, Jens Bo

PY - 2015/10/23

Y1 - 2015/10/23

N2 - We present a systematic study of the crystal-field interactions in the LiRF4 (R=Gd, Ho, Er, Tm, and Yb) family of rare-earth magnets. Using detailed inelastic neutron scattering measurements, we have been able to quantify the transition energies and wave functions for each system. This allows us to quantitatively describe the high-temperature susceptibility measurements for the series of materials and make predictions based on a mean-field approach for the low-temperature thermal and quantum phase transitions. We show that coupling between crystal field and phonon states leads to line-shape broadening in LiTmF4 and level splitting in LiYbF4. Furthermore, using high-resolution neutron scattering from LiHoF4, we find anomalous broadening of crystal-field excitations which we attribute to magnetoelastic coupling.

AB - We present a systematic study of the crystal-field interactions in the LiRF4 (R=Gd, Ho, Er, Tm, and Yb) family of rare-earth magnets. Using detailed inelastic neutron scattering measurements, we have been able to quantify the transition energies and wave functions for each system. This allows us to quantitatively describe the high-temperature susceptibility measurements for the series of materials and make predictions based on a mean-field approach for the low-temperature thermal and quantum phase transitions. We show that coupling between crystal field and phonon states leads to line-shape broadening in LiTmF4 and level splitting in LiYbF4. Furthermore, using high-resolution neutron scattering from LiHoF4, we find anomalous broadening of crystal-field excitations which we attribute to magnetoelastic coupling.

U2 - 10.1103/PhysRevB.92.144422

DO - 10.1103/PhysRevB.92.144422

M3 - Article

SN - 1098-0121

VL - 92

JO - Physical Review B

JF - Physical Review B

IS - 14

M1 - 144422

ER -

Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R=Gd, Ho, Er, Tm, and Yb)

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Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF₄ (R=Gd, Ho, Er, Tm, and Yb)