Artículos de revistas
Search For Spin-lattice Coupling Mediated By Itinerant Electrons: Synchrotron X-ray Diffraction And Raman Scattering From Gd Al3
Registro en:
Physical Review B - Condensed Matter And Materials Physics. , v. 77, n. 2, p. - , 2008.
10980121
10.1103/PhysRevB.77.024414
2-s2.0-38349112924
Autor
Garcia-Flores A.F.
Malachias A.
Granado E.
Fisk Z.
Institución
Resumen
The coupling among the spin degree of freedom and the atomic displacements in intermetallic Gd Al3 was investigated by means of synchrotron x-ray diffraction and polarized Raman scattering. In this compound, the Gd 4 f7 shell is spherical and the spin-lattice coupling provides a fingerprint of the exchange mechanism and degree of magnetic correlations. X-ray diffraction shows nonresonant symmetry-forbidden charge Bragg peaks below the long-range magnetic ordering temperature TN =18 K, revealing a symmetry-lowering crystal lattice transition associated with Gd displacements, consistent with a Ruderman-Kittel-Kasuya-Yosida mechanism for the magnetic coupling. Raman scattering in fresh broken surfaces shows phonons with conventional frequency behavior, while naturally grown and polished surfaces present frequency anomalies below T* ∼50 K. Such anomalies are possibly due to a modulation of the magnetic energy by the lattice vibrations in a strongly spin-correlated paramagnetic phase. Such interpretation implies that the spin-phonon coupling in metals may depend on the surface conditions. A fully spin-correlated state immediately above TN is inferred from our results in this frustrated system. © 2008 The American Physical Society. 77 2
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