Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Poster Session: Correlated Electrons 2

TT 50.20: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Magnetic and ultrasound investigation of the frustrated magnet Nd₂Zr₂O₇ at low temperatures. — •Y. Gritsenko^{1, 2, 3}, M. Ciomaga Hatnean⁴, O. A. Petrenko⁴, G. Balakrishnan⁴, S. Zherlitsyn³, and J. Wosnitza^{1, 2, 3} — ¹SFB 1143, Dresden — ²Institut für Festkörper- und Materialphysik, TU Dresden — ³Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Germany — ⁴Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom

We report ultrasound and magnetic property studies of large high-quality single crystals of the frustrated magnet Nd₂Zr₂O₇, with pyrochlore structure. The temperature dependence of the magnetic susceptibility and the acoustic properties show no magnetic ordering down to 0.5 K. Fits to the magnetic-susceptibility data using a Curie-Weiss law reveal a ferromagnetic coupling between the Nd moments. Magnetization versus field measurements show a local Ising anisotropy along the <111> axes of the Nd³⁺ ions in the ground state. We performed ultrasound measurements for c₄₄ acoustic mode (with wave vector parallel to [110], and polarization along [001]), with magnetic field applied along the [110] direction. We observed distinct anomalies below 1 K. A sharp minimum at about 0.25 T suggests a field-induced phase transition.