Bibliographic Details
| Title: |
Field dependence of the Eu2+ spin relaxation in EuFe2-xCoxAs2. |
| Authors: |
Garcia, F. A.1 fgarcia@ifi.unicamp.br, Leithe-Jasper, A.1, Schnelle, W.1, Nicklas, M.1, Rosner, H.1, Sichelschmidt, J.1 |
| Source: |
New Journal of Physics. 2012, Vol. 14 Issue 6, p1-12. 12p. |
| Subjects: |
Magnetic properties, Couplings (Gearing), Fluctuations (Physics), Relaxation (Nuclear physics), Superconductivity, Physics |
| Abstract: |
The layered compound EuFe2As2 is an interesting model system to investigate the effects of well-defined local Eu2+ 4f states on the itinerant electronic and magnetic properties of the FeAs layers. To address this subject, we investigated the series EuFe2-xCoxAs2 (0.1 ⩽ x ⩽ 0.75) by electron spin resonance (ESR) of Eu2+ to probe the spin dynamics of the itinerant subsystem. We relate the results to dc-susceptibility measurements and band structure calculations. As a consequence of the weak coupling between the local and itinerant subsystems, we found that the spin relaxation is well understood in terms of the exchange coupling among the local Eu2+ spins. A pronounced field dependence of the Eu2+ spin relaxation demonstrates the direct influence of magnetic fluctuations at the Fe2-xCoxAs2 layers. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
