Investigation on magnetoacoustic properties of spin-ice materials Dy2Ti2O7 and Ho2Ti2O7


Investigation on magnetoacoustic properties of spin-ice materials Dy2Ti2O7 and Ho2Ti2O7

Erfanifam, S.; Zherlitsyn, S.; Wosnitza, J.; Moessner, R.; Zvyagin, A. A.; Mcclarty, P.; Petrenko, O.; Balakrishnan, G.

We have investigated elastic properties of the spin-ice materials Dy2Ti2O7 (DTO) and Ho2Ti2O7 (HTO) for a wide range of temperature and magnetic field. Our studies of the sound characteristics for several acoustic modes evidence a renormalization of the sound velocity and the sound attenuation due to phase transformations at applied magnetic field as well as an interaction with low-energy magnetic excitations (topological defects). The most prominent anomalies are quasi-periodic peaks in the sound velocity and in the sound attenuation observed in DTO due to non-equilibrium processes arising in the external magnetic field. These results were analyzed theoretically using exchange-striction coupling, which shows a good agreement between theory and experiment. The obtained results at high magnetic fields exhibit some pronounced anomalies around 50 T for both compounds. Our calculations including crystal-electric field effects show satisfactory agreement with experiment.

  • Lecture (Conference)
    Frühjahrstagung der DPG, 10.-15.03.2013, Regensburg, Deutschland

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Publ.-Id: 18627