Ultrasound
The sound velocity and attenuation are measured using a pulse-echo method with a phase-sensitive detection technique [1].
Principle sketch of the measurement setup
The ultrasound frequency is 5 - 500 MHz.
The sample size should be > 0.5 mm along the sound propagation.
Standard temperature range is 1.3 – 300 K. Low temperatures in a 3He-system are possible.
The technique is best suited for magnet types A or B but can be installed in all other magnets.
The resolution for the relative sound-velocity change is 10-5 and 10-3 for the sound attenuation.
Sound velocity versus magnetic field in the frustrated antiferromagnet CdCr2O4 [2].
[1] S. Zherlitsyn et al., Low Temp. Phys. 40, 123 (2014)(1)
[2] S. Zherlitsyn et al., Phys. Rev. B 91, 060406(R) (2015)(2)
URL of this article
https://www.hzdr.de/db/Cms?pOid=46374
Links of the content
(1) | http://scitation.aip.org/content/aip/journal/ltp/40/2/10.1063/1.4865559 |
(2) | http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.060406 |