Spin dynamics in stripe-ordered La5/3Sr1/3NiO4

0185740 - UJF-V 20033056 RIV US eng J - Článek v odborném periodiku
Boothroyd, A. T. - Prabhakaran, D. - Freeman, PG. - Lister, S. J. S. - Enderle, M. - Hiess, A. - Kulda, Jiří
Spin dynamics in stripe-ordered La5/3Sr1/3NiO4.
Physical Review. B. Roč. 67, č. 10 (2003), s. -100407. ISSN 1098-0121
Grant CEP: GA AV ČR KSK1010104
Klíčová slova: wave excitations * superconductors * fluctuations
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.962, rok: 2003

Polarized- and unpolarized-neutron inelastic scattering has been used to measure the spin excitations in the striped spin-charge-ordered phase of La5/3Sr1/3NiO4. Above 30 meV, sharp magnetic modes are observed characteristic of a static stripe lattice. This part of the energy spectrum is described well by a linear spin-wave model with intrastripe and interstripe exchange interactions between neighboring Ni spins given by J = 15 +/- 1.5 meV and J' = 7.5 +/- 1.5 meV, respectively. A pronounced suppression and broadening of the magnetic fluctuations in a band between 10 meV and 25 meV is suggestive of coupling to collective motions of the stripe domain walls.
Trvalý link: http://hdl.handle.net/11104/0082122