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Magnetic phase diagram and magnetoelastic coupling of NiTiO_3

机译：nitio_3的磁相图和磁形耦合

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摘要

We report high-resolution dilatometry on high-quality single crystals of NiTiO_3 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 = 15 T 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, Grueneisen 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 NiTiO_3.
机译：我们通过光学浮区技术报告高质量单晶的高质量单晶的高分辨率扩张。各向异性磁相图是由热膨胀和磁致索研究构成，最高可达B = 15 T的静态（15-T）和脉冲（60-T）磁场的磁化研究。我们的数据允许我们定量地研究磁力弹性耦合并确定单轴压力依赖性。虽然发现熵变为磁性，但是Grooisen分析只意味着整个低温制度中的一个相关的能量尺度。由此，我们的数据表明，由于磁力耦合和先前报道的磁电耦合引起的观察到的结构变化[L. Balhorn，J. Hazi，M.C.Kemei和R. Seshadri，Phy。 Rev. B 93,104404（2016）]由相同的磁性自由度驱动，导致Nitio_3中的远程磁场。

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  • 来源
    《Physical review》 |2020年第19期|195122.1-195122.8|共8页
  • 作者

    K. Dey; S. Sauerland; J. Werner; Y. Skourski; M. Abdel-Hatiez; R. Bag; S. Singh; R. Klingeler;

  • 作者单位

    Kirchhoff Institute of Physics Heidelberg University INF 227 D-69120 Heidelberg Germany;

    Kirchhoff Institute of Physics Heidelberg University INF 227 D-69120 Heidelberg Germany;

    Kirchhoff Institute of Physics Heidelberg University INF 227 D-69120 Heidelberg Germany;

    Dresden High Magnetic Field Laboratory (HLD-EMFL) Helmhollz-Zentrum Dresden Rossendorf D-01314 Dresden Germany;

    Harvard University Cambridge Massachusetts 02138 USA;

    Indian Institute of Science Education and Research Pune Maharashtra 411008 India;

    Indian Institute of Science Education and Research Pune Maharashtra 411008 India;

    Kirchhoff Institute of Physics Heidelberg University INF 227 D-69120 Heidelberg Germany Centre for Advanced Materials (CAM) Heidelberg University INF 225 D-69120 Heidelberg Germany;

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