Evidence of The Anomalous Fluctuating Magnetic State by Pressure Driven 4f Valence Change in EuNiGe${}_3$

Abstract

In rare-earth compounds with valence fluctuation, the proximity of the 4f level to the Fermi energy leads to instabilities of the charge configuration and the magnetic moment. Here, we provide direct experimental evidence for an induced magnetic polarization of the Eu${}^{3+}$ atomic shell with J=0, due to intra-atomic exchange and spin-orbital coupling interactions with Eu${}^{2+}$ atomic shell. By applying external pressure, a transition from antiferromagnetic to a fluctuating behavior in a EuNiGe${}_3$ single crystals is probed. Magnetic polarization is observed for both valence states of Eu${}^{2+}$ and Eu${}^{3+}$ across the entire pressure range. The anomalous magnetism is discussed in terms of a homogeneous intermediate valence state where frustrated Dzyaloshinskii-Moriya couplings are enhanced by the onset of spin-orbital interaction and engender a chiral spin-liquid-like precursor.

References in corpus (15)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• Quantum Criticality in Heavy Fermion Metals
• Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe
• Magnetic Coupling Between Non-Magnetic Ions: Eu3+ in EuN and EuP
• Pressure-induced electronic mixing and enhancement of ferromagnetic ordering in EuX (X=Te, Se, S, O) magnetic semiconductors
• Europium nitride: A novel diluted magnetic semiconductor
• Antiferromagnetism in EuNiGe3
• Magnetic properties of EuPtSi${}_3$ single crystals
• Antiferromagnetic ordering in EuPtGe${}_3$ single crystal
• Exploring metamagnetism of single crystalline \eun\ by neutron scattering
• Magnetic polarization of the americium $J=0$ ground state in AmFe${}_2$
• Bulk electronic structure of non-centrosymmetric EuTGe3 (T= Co, Ni, Rh, Ir) studied by hard x-ray photoelectron spectroscopy
• Valence fuctuation and magnetic ordering in EuNi2(P1-xGex)2 single crystals
• Long range antiferromagnetic order of formally non-magnetic Eu${}^{3+}$ Van Vleck ions observed in multiferroic Eu${}_{1-x}$Y${}_x$MnO${}_3$
• Enhanced conduction band density of states in intermetallic EuTSi${}_3$ (T=Rh, Ir)

Cited by in corpus (2)

• Synchrotron x-ray diffraction and DFT study of non-centrosymmetric EuRhGe3 under high pressure
• Collinear Magnetic Structure in the Diamond Network Magnet EuTi${}_2$Al${}_{20}$