Ultrasonic attenuation anomalies at the two transitions in antiferromagnetic FeGe2 |
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Authors: | V Pluzhnikov D Feder E Fawcett |
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Institution: | Physics Department, University of Toronto, Toronto M5S 1A7, Canada |
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Abstract: | The attenuation of longitudinal and shear sound waves is measured through the Néel temperature, TN≈286 K, and the lower transition temperature, TK≈265 K, of FeGe2. Longitudinal sound with wavevector q along the 100] axis of this tetragonal antiferromagnetic metal shows an attenuation peak at TN, which is reversibly suppressed by compressive uniaxial stress σ along 010]. The estimated pressure dependence of TN is dTN/dp=(?2.8±0.3) mK bar?1. The peak at TN shows thermal and stress hysteresis, which suggests that it is associated with domain wall motion and that this transition is first order. |
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