Phonon-assisted relaxation in a frustrated antiferromagnet

H. Mutka; C. Payen; D. Bono; G. Ehlers; P. Fouquet; M. R. Johnson; P. Mendels; J. Y. Mevellec; J. R. Stewart

doi:10.1016/j.jmmm.2006.10.848

Phonon-assisted relaxation in a frustrated antiferromagnet

H. Mutka, C. Payen, D. Bono, G. Ehlers, P. Fouquet, M. R. Johnson, P. Mendels, J. Y. Mevellec, J. R. Stewart

Research output: Contribution to journal › Article › peer-review

Abstract

A thermally activated magnetic relaxation is observed using neutron spin-echo in the pyrochlore slab (kagomé bilayer) compound SrCr_{9 x} Ga_{12 - 9 x} O₁₉ (x = 0.95) in a restricted temperature range, 4 K < T < 7 K, above a cross-over to a low temperature relaxation regime with a weaker temperature dependence. The activation energy of the thermally activated relaxation, of the order of 7 meV, coincides with the energy of a phonon mode observed with neutron and Raman spectroscopy, indicating a phonon-assisted regime. The experimental observation of phonon-assisted process gives additional insight to the importance of spin-phonon coupling in frustrated magnets with regard to the models mostly based on purely magnetic interactions.

Original language	English
Pages (from-to)	1325-1327
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 2
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.848
State	Published - Mar 2007
Externally published	Yes

Keywords

Frustration
Neutron spin-echo
Slow dynamics

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10.1016/j.jmmm.2006.10.848

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title = "Phonon-assisted relaxation in a frustrated antiferromagnet",

abstract = "A thermally activated magnetic relaxation is observed using neutron spin-echo in the pyrochlore slab (kagom{\'e} bilayer) compound SrCr9 x Ga12 - 9 x O19 (x = 0.95) in a restricted temperature range, 4 K < T < 7 K, above a cross-over to a low temperature relaxation regime with a weaker temperature dependence. The activation energy of the thermally activated relaxation, of the order of 7 meV, coincides with the energy of a phonon mode observed with neutron and Raman spectroscopy, indicating a phonon-assisted regime. The experimental observation of phonon-assisted process gives additional insight to the importance of spin-phonon coupling in frustrated magnets with regard to the models mostly based on purely magnetic interactions.",

keywords = "Frustration, Neutron spin-echo, Slow dynamics",

author = "H. Mutka and C. Payen and D. Bono and G. Ehlers and P. Fouquet and Johnson, {M. R.} and P. Mendels and Mevellec, {J. Y.} and Stewart, {J. R.}",

year = "2007",

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doi = "10.1016/j.jmmm.2006.10.848",

language = "English",

volume = "310",

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journal = "Journal of Magnetism and Magnetic Materials",

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TY - JOUR

T1 - Phonon-assisted relaxation in a frustrated antiferromagnet

AU - Mutka, H.

AU - Payen, C.

AU - Bono, D.

AU - Ehlers, G.

AU - Fouquet, P.

AU - Johnson, M. R.

AU - Mendels, P.

AU - Mevellec, J. Y.

AU - Stewart, J. R.

PY - 2007/3

Y1 - 2007/3

N2 - A thermally activated magnetic relaxation is observed using neutron spin-echo in the pyrochlore slab (kagomé bilayer) compound SrCr9 x Ga12 - 9 x O19 (x = 0.95) in a restricted temperature range, 4 K < T < 7 K, above a cross-over to a low temperature relaxation regime with a weaker temperature dependence. The activation energy of the thermally activated relaxation, of the order of 7 meV, coincides with the energy of a phonon mode observed with neutron and Raman spectroscopy, indicating a phonon-assisted regime. The experimental observation of phonon-assisted process gives additional insight to the importance of spin-phonon coupling in frustrated magnets with regard to the models mostly based on purely magnetic interactions.

AB - A thermally activated magnetic relaxation is observed using neutron spin-echo in the pyrochlore slab (kagomé bilayer) compound SrCr9 x Ga12 - 9 x O19 (x = 0.95) in a restricted temperature range, 4 K < T < 7 K, above a cross-over to a low temperature relaxation regime with a weaker temperature dependence. The activation energy of the thermally activated relaxation, of the order of 7 meV, coincides with the energy of a phonon mode observed with neutron and Raman spectroscopy, indicating a phonon-assisted regime. The experimental observation of phonon-assisted process gives additional insight to the importance of spin-phonon coupling in frustrated magnets with regard to the models mostly based on purely magnetic interactions.

KW - Frustration

KW - Neutron spin-echo

KW - Slow dynamics

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U2 - 10.1016/j.jmmm.2006.10.848

DO - 10.1016/j.jmmm.2006.10.848

M3 - Article

AN - SCOPUS:33847407620

SN - 0304-8853

VL - 310

SP - 1325

EP - 1327

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2 SUPPL. PART 2

ER -

Phonon-assisted relaxation in a frustrated antiferromagnet

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Keywords

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