Dynamics of frustrated magnetic moments in TbNiAl

G. Ehlers; H. Casalta; R. E. Lechner; H. Maletta

doi:10.1007/s003390101126

Dynamics of frustrated magnetic moments in TbNiAl

G. Ehlers
, H. Casalta
, R. E. Lechner
, H. Maletta

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

1 Scopus citations

Abstract

We have studied the dynamics of Tb spins in the intermetallic compound TbNiAl in the paramagnetic and ordered antiferromagnetic (afm) phases by means of neutron time-of-flight and spin-echo spectroscopy. TbNiAl is a frustrated antiferromagnet (T_N = 47 K). In the afm phase both regular long-range-ordered Tb spins as well as frustrated Tb spins exist (the latter have a reduced moment). The quasielastic measurements show that in the ordered phase the frustrated moments relax on a time scale of 0.01 ns to 0.1 ns. The intermediate scattering function l(q, t) is q-independent and exponential in time. Below T_N, in the spin-echo time window, I(q,t) reaches a plateau above zero, while above T_N the relaxation is complete (the correlation function converges to zero).

Original language	English
Pages (from-to)	S613-S615
Journal	Applied Physics A: Materials Science and Processing
Volume	74
Issue number	SUPPL.I
DOIs	https://doi.org/10.1007/s003390101126
State	Published - Dec 2002
Externally published	Yes

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title = "Dynamics of frustrated magnetic moments in TbNiAl",

abstract = "We have studied the dynamics of Tb spins in the intermetallic compound TbNiAl in the paramagnetic and ordered antiferromagnetic (afm) phases by means of neutron time-of-flight and spin-echo spectroscopy. TbNiAl is a frustrated antiferromagnet (TN = 47 K). In the afm phase both regular long-range-ordered Tb spins as well as frustrated Tb spins exist (the latter have a reduced moment). The quasielastic measurements show that in the ordered phase the frustrated moments relax on a time scale of 0.01 ns to 0.1 ns. The intermediate scattering function l(q, t) is q-independent and exponential in time. Below TN, in the spin-echo time window, I(q,t) reaches a plateau above zero, while above TN the relaxation is complete (the correlation function converges to zero).",

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T1 - Dynamics of frustrated magnetic moments in TbNiAl

AU - Ehlers, G.

AU - Casalta, H.

AU - Lechner, R. E.

AU - Maletta, H.

PY - 2002/12

Y1 - 2002/12

N2 - We have studied the dynamics of Tb spins in the intermetallic compound TbNiAl in the paramagnetic and ordered antiferromagnetic (afm) phases by means of neutron time-of-flight and spin-echo spectroscopy. TbNiAl is a frustrated antiferromagnet (TN = 47 K). In the afm phase both regular long-range-ordered Tb spins as well as frustrated Tb spins exist (the latter have a reduced moment). The quasielastic measurements show that in the ordered phase the frustrated moments relax on a time scale of 0.01 ns to 0.1 ns. The intermediate scattering function l(q, t) is q-independent and exponential in time. Below TN, in the spin-echo time window, I(q,t) reaches a plateau above zero, while above TN the relaxation is complete (the correlation function converges to zero).

AB - We have studied the dynamics of Tb spins in the intermetallic compound TbNiAl in the paramagnetic and ordered antiferromagnetic (afm) phases by means of neutron time-of-flight and spin-echo spectroscopy. TbNiAl is a frustrated antiferromagnet (TN = 47 K). In the afm phase both regular long-range-ordered Tb spins as well as frustrated Tb spins exist (the latter have a reduced moment). The quasielastic measurements show that in the ordered phase the frustrated moments relax on a time scale of 0.01 ns to 0.1 ns. The intermediate scattering function l(q, t) is q-independent and exponential in time. Below TN, in the spin-echo time window, I(q,t) reaches a plateau above zero, while above TN the relaxation is complete (the correlation function converges to zero).

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DO - 10.1007/s003390101126

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JO - Applied Physics A: Materials Science and Processing

JF - Applied Physics A: Materials Science and Processing

IS - SUPPL.I

ER -

Dynamics of frustrated magnetic moments in TbNiAl

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