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