Ultrasound

The sound velocity and attenuation are measured using a pulse-echo method with a phase-sensitive detection technique [1].

Ultrasound setup 

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.

Ultrasound CdCr2O2 

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