Magnetic phase diagram and magnetoelastic coupling of NiTiO3

K. Dey, S. Sauerland, J. Werner, Y. Skourski, M. Abdel-Hafiez, R. Bag, S. Singh, and R. Klingeler
Phys. Rev. B 101, 195122 – Published 13 May 2020
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Abstract

We report high-resolution dilatometry on high-quality single crystals of NiTiO3 grown by means of the optical floating-zone technique. The anisotropic magnetic phase diagram is constructed from thermal expansion and magnetostriction studies up to B=15T and magnetization studies in static (15-T) and pulsed (60-T) magnetic fields. Our data allow us to quantitatively study magnetoelastic coupling and to determine uniaxial pressure dependencies. While the entropy changes are found to be of magnetic nature, Grüneisen analysis implies only one relevant energy scale in the whole low-temperature regime. Thereby, our data suggest that the observed structural changes due to magnetoelastic coupling and previously reported magnetodielectric coupling [L. Balhorn, J. Hazi, M. C. Kemei, and R. Seshadri, Phys. Rev. B 93, 104404 (2016)] are driven by the same magnetic degrees of freedom that lead to long-range magnetic order in NiTiO3.

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  • Received 14 February 2020
  • Revised 31 March 2020
  • Accepted 23 April 2020

DOI:https://doi.org/10.1103/PhysRevB.101.195122

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

K. Dey1,*,†, S. Sauerland1,†, J. Werner1, Y. Skourski2, M. Abdel-Hafiez3, R. Bag4, S. Singh4, and R. Klingeler1,5

  • 1Kirchhoff Institute of Physics, Heidelberg University, INF 227, D-69120 Heidelberg, Germany
  • 2Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden Rossendorf, D-01314 Dresden, Germany
  • 3Harvard University, Cambridge, Massachusetts 02138, USA
  • 4Indian Institute of Science Education and Research, Pune, Maharashtra 411008, India
  • 5Centre for Advanced Materials (CAM), Heidelberg University, INF 225, D-69120 Heidelberg, Germany

  • *kaustav.dey@kip.uni-heidelberg.de
  • These authors contributed equally to this work.

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Issue

Vol. 101, Iss. 19 — 15 May 2020

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