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<p>We present a comprehensive investigation into the physical properties of intermetallic ErPd<sub>2</sub>Si<sub>2</sub>, a compound renowned for its intriguing magnetic and electronic characteristics. We confirm the tetragonal crystal structure of ErPd<sub>2</sub>Si<sub>2</sub> within the <i>I</i>4/<i>mmm</i> space group. Notably, we observed anisotropic thermal expansion, with the lattice constant <i>a</i> expanding and <i>c</i> contracting between 15 and 300&#xa0;K. This behaviour is attributed to lattice vibrations and electronic contributions. Heat capacity measurements revealed three distinct temperature regimes: <i>T</i><sub>1</sub> ~ 3.0&#xa0;K, <i>T</i><sub>N</sub> ~ 4.20&#xa0;K, and <i>T</i><sub>2</sub> ~ 15.31&#xa0;K. These correspond to the disappearance of spin-density waves, the onset of an incommensurate antiferromagnetic (AFM) structure, and the crystal-field splitting and/or the presence of short-range spin fluctuations, respectively. Remarkably, the AFM phase transition anomaly was observed exclusively in low-field magnetization data (120 Oe) at <i>T</i><sub>N</sub>. A high magnetic field (<i>B</i> = 3&#xa0;T) effectively suppressed this anomaly, likely due to spin-flop and spin-flip transitions. Furthermore, the extracted effective paramagnetic (PM) moments closely matched the expected theoretical value, suggesting a dominant magnetic contribution from localized 4f spins of Er. Additionally, significant differences in resistance (<i>R</i>) values at low temperatures under applied <i>B</i> indicated a magnetoresistance (MR) effect with a minimum value of −4.36%. Notably, the measured MR effect exhibited anisotropic behavior, where changes in the strength or direction of the applied <i>B</i> induced variations in the MR effect. A twofold symmetry of <i>R</i> was discerned at 3 and 9&#xa0;T, originating from the orientation of spin moments relative to the applied <i>B</i>. Intriguingly, above <i>T</i><sub>N</sub>, short-range spin fluctuations also displayed a preferred orientation along the <i>c</i>-axis due to single-ion anisotropy. Moreover, the <i>R</i> demonstrated a clear <i>B</i> dependence below 30&#xa0;K. The magnetic-field point where <i>R</i> transitions from linear <i>B</i> dependence to a stable state increased with temperature: ~ 3&#xa0;T (at 2&#xa0;K), ~ 4.5&#xa0;T (at 4&#xa0;K), and ~ 6&#xa0;T (at 10&#xa0;K). Our study sheds light on the magnetic and electronic properties of ErPd<sub>2</sub>Si<sub>2</sub>, offering valuable insights for potential applications in spintronics and quantum technologies.</p> Graphical abstract <p></p>

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Unraveling the magnetic and electronic complexity of intermetallic ErPd2Si2: anisotropic thermal expansion, phase transitions, and twofold magnetotransport behaviour

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Kaitong Sun,
  • Si Wu,
  • Guanping Xu,
  • Lingwei Li,
  • Hongyu Chen,
  • Qian Zhao,
  • Muqing Su,
  • Wolfgang Schmidt,
  • Chongde Cao,
  • Hai-Feng Li

摘要

We present a comprehensive investigation into the physical properties of intermetallic ErPd2Si2, a compound renowned for its intriguing magnetic and electronic characteristics. We confirm the tetragonal crystal structure of ErPd2Si2 within the I4/mmm space group. Notably, we observed anisotropic thermal expansion, with the lattice constant a expanding and c contracting between 15 and 300 K. This behaviour is attributed to lattice vibrations and electronic contributions. Heat capacity measurements revealed three distinct temperature regimes: T1 ~ 3.0 K, TN ~ 4.20 K, and T2 ~ 15.31 K. These correspond to the disappearance of spin-density waves, the onset of an incommensurate antiferromagnetic (AFM) structure, and the crystal-field splitting and/or the presence of short-range spin fluctuations, respectively. Remarkably, the AFM phase transition anomaly was observed exclusively in low-field magnetization data (120 Oe) at TN. A high magnetic field (B = 3 T) effectively suppressed this anomaly, likely due to spin-flop and spin-flip transitions. Furthermore, the extracted effective paramagnetic (PM) moments closely matched the expected theoretical value, suggesting a dominant magnetic contribution from localized 4f spins of Er. Additionally, significant differences in resistance (R) values at low temperatures under applied B indicated a magnetoresistance (MR) effect with a minimum value of −4.36%. Notably, the measured MR effect exhibited anisotropic behavior, where changes in the strength or direction of the applied B induced variations in the MR effect. A twofold symmetry of R was discerned at 3 and 9 T, originating from the orientation of spin moments relative to the applied B. Intriguingly, above TN, short-range spin fluctuations also displayed a preferred orientation along the c-axis due to single-ion anisotropy. Moreover, the R demonstrated a clear B dependence below 30 K. The magnetic-field point where R transitions from linear B dependence to a stable state increased with temperature: ~ 3 T (at 2 K), ~ 4.5 T (at 4 K), and ~ 6 T (at 10 K). Our study sheds light on the magnetic and electronic properties of ErPd2Si2, offering valuable insights for potential applications in spintronics and quantum technologies.

Graphical abstract