Magneto-Elastic Coupling in the Layered Manganite La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$

C. N. Brosseau; M. Poirier; R. Suryanarayanan; G. Dhalenne; A. Revcolevschi

Magneto-Elastic Coupling in the Layered Manganite La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$

Strongly Correlated Electrons 2007-05-23 v1 Materials Science

Authors: C. N. Brosseau , M. Poirier , R. Suryanarayanan , G. Dhalenne , A. Revcolevschi

Abstract

We have studied the magneto-elastic coupling in the double layered Mn perovskite La $_{1.2}$ Sr $_{1.8}$ Mn $_2$ O $_7$ with an ultrasonic velocity technique. The temperature profile of both the in-plane and out-of-plane longitudinal velocities showed a large stiffening anomaly below the insulating paramagnetic to metallic ferromagnetic transition. Magnetic fluctuations effects consistent with the layered structure are evidenced as a frequency dependent velocity softening above the transition. The magneto-elastic coupling has been studied in magnetic field values up to 8 Tesla: the observations are consistent with a substantial magnetic anisotropy and a ferromagnetic order parameter with moments lying in the layers.

Keywords

magneto-elastic coupling ultrasonic velocity manganite magnetic anisotropy ferromagnetic order

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@article{arxiv.cond-mat/0012380,
  title  = {Magneto-Elastic Coupling in the Layered Manganite La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$},
  author = {C. N. Brosseau and M. Poirier and R. Suryanarayanan and G. Dhalenne and A. Revcolevschi},
  journal= {arXiv preprint arXiv:cond-mat/0012380},
  year   = {2007}
}

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Magneto-Elastic Coupling in the Layered Manganite La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$

Abstract

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