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Multiple ferromagnetic transitions and structural distortion in the van der Waals ferromagnet VI3 at ambient and finite pressures

Elena Gati, Yuji Inagaki, Tai Kong, Robert J. Cava, Yuji Furukawa, Paul C. Canfield, and Sergey L. Bud'ko
Phys. Rev. B 100, 094408 – Published 5 September 2019

Abstract

We present a combined study of zero-field V51 and I127 NMR at ambient pressure and specific heat and magnetization measurements under pressure up to 2.08 GPa on bulk single crystals of the van der Waals ferromagnet VI3. At ambient pressure, our results consistently demonstrate that VI3 undergoes a structural transition at Ts78K, followed by two subsequent ferromagnetic transitions at TFM150K and TFM236K upon cooling. At lowest temperature (T<TFM2), two magnetically ordered V sites exist, whereas only one magnetically ordered V site is observed for TFM1<T<TFM2. Whereas TFM1 is almost unaffected by external pressure, TFM2 is highly responsive to pressure and merges with the TFM1 line at p0.6GPa. At even higher pressures (p1.25GPa), the TFM2 line merges with the structural transition at Ts which becomes moderately suppressed with p for p<1.25GPa. Taken together, our data point toward a complex magnetic structure and an interesting interplay of magnetic and structural degrees of freedom in VI3.

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  • Received 19 July 2019
  • Revised 16 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.094408

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Elena Gati1,2, Yuji Inagaki1,2,3, Tai Kong4, Robert J. Cava4, Yuji Furukawa1,2, Paul C. Canfield1,2, and Sergey L. Bud'ko1,2

  • 1Ames Laboratory, US Department of Energy, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
  • 4Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA

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Issue

Vol. 100, Iss. 9 — 1 September 2019

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