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TT: Fachverband Tiefe Temperaturen

TT 9: f-Electron Systems and Heavy Fermions II

TT 9.3: Vortrag

Montag, 27. März 2023, 15:30–15:45, HSZ 201

Impact of Fe substitution on the electronic structure of URu₂Si₂ — •Andrea Marino¹, Denise S. Christovam¹, Chun-Fu Chang¹, Johannes Falke¹, Chang-Yang Kuo², Chi-Nan Wu², Martin Sundermann^1,3, Andrea Amorese^1,3, Hlynur Gretarsson^4,5, Camilla Moir⁶, M. Brian Maple⁶, Peter Thalmeier¹, Liu Hao Tjeng¹, and Andrea Severing³ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²National Synchrotron Radiation Research Center, Hsinchu, Taiwan — ³University of Cologne, Cologne, Germany — ⁴Max Planck Institute for Solid State Research, Stuttgart, Germany — ⁵PETRA III, DESY, Hamburg, Germany — ⁶University of California, San Diego, USA

The application of pressure as well as the substitution of Ru with Fe in the hidden order (HO) compound URu₂Si₂ lead to the formation of the large moment antiferromagnetic phase (LMAFM), with the respective phase diagrams bearing similarities for low Fe content (<0.3). For higher Fe content (>1) URu_(2−x)Fe_(x)Si₂ adopts the Pauli paramagnetic ground state of UFe₂Si₂. However, the question remains open what causes the suppression of HO in favour of the LMAFM phase. We investigate the URu_(2−x)Fe_(x)Si₂ series with 4f core-level photoelectron spectroscopy. The 4f satellite features are enhanced at low Fe content (x<0.4) and suppressed as x increases, following the trend shown by the ordered moment. We discuss this in terms of the variation of the filling of the 5f shell. Implications for the exchange interaction in a Doniach phase diagram picture are then also considered.