Pressure control of magnetic state in EuCd₂As₂

EuCd₂As₂ has been predicted to be an ideal platform for studies of intrinsic topological magnetic systems for the possibility of hosting a single pair of Weyl points when tuned into the ferromagnetic phase from the antiferromagnetic state by external pressure, external magnetic field, or chemical doping [1-2]. In search of the ideal topological state, we have systematically investigated pressure controlling of the magnetic state up to 43 GPa using synchrotron Mössbauer spectroscopy and valence state verification using X-ray absorption spectroscopy along with structural refinement using high-resolution X-ray diffraction. A detailed discussion of experimental results will be presented.

References:

[1] E.  Gati, S.  L.  Bud’ko, L.-L.  Wang, A.  Valadkhani, R.  Gupta, B.  Kuthanazhi, L.  Xiang, J.  M.  Wilde, A. Sapkota, Z. Guguchia, R. Khasanov, R. Valenti, and P. C. Canfield, Pressure-induced ferromagnetism in the topological semimetal EuCd2As2, arXiv:2108.01871 (2021).

[2] J.-R. Soh, F. de Juan, M.G. Vergniory, N.B.M. Schröter, M.C. Rahn, D.Y. Yan, J. Jiang, M. Bristow, P.A. Reiss, J.N. Blandy, Y.F. Guo, Y.G. Shi, T.K. Kim, A. McCollam, S.H. Simon, Y. Chen, A.I. Coldea, and A.T. Boothroyd, Phys. Rev. B 100, 201102 (2019).