Evolution of the spectral lineshape at the magnetic transition in Sr $$_2$$ 2 IrO $$_4$$ 4 and Sr $$_3$$ 3 Ir $$_2$$ 2 O $$_7$$ 7

Paul Foulquier, Marcello Civelli, Marcelo Rozenberg, Alberto Camjayi, Joel Bobadilla, Dorothée Colson, Anne Forget, Pierre Thuéry, François Bertran, Patrick Le Fèvre and Véronique Brouet ()
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Paul Foulquier: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Marcello Civelli: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Marcelo Rozenberg: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Alberto Camjayi: Departamento de Física, FCEN, UBA, and IFIBA, CONICET, Pabellón 1, Ciudad Universitaria
Joel Bobadilla: Departamento de Física, FCEN, UBA, and IFIBA, CONICET, Pabellón 1, Ciudad Universitaria
Dorothée Colson: Université Paris-Saclay, CEA, CNRS, SPEC
Anne Forget: Université Paris-Saclay, CEA, CNRS, SPEC
Pierre Thuéry: Université Paris-Saclay, CEA, CNRS, NIMBE
François Bertran: Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin-BP 48
Patrick Le Fèvre: Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin-BP 48
Véronique Brouet: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides

The European Physical Journal B: Condensed Matter and Complex Systems, 2023, vol. 96, issue 4, 1-12

Abstract: Abstract Sr $$_2$$ 2 IrO $$_4$$ 4 and Sr $$_3$$ 3 Ir $$_2$$ 2 O $$_7$$ 7 form two families of spin-orbit Mott insulators with quite different charge gaps and an antiferromagnetic (AF) ground state. This offers a unique opportunity to study the impact of long-range magnetic order in Mott insulators. It appears to play a different role in the two families, as there is almost no change of the resistivity at the magnetic transition $$T_N$$ T N in Sr $$_2$$ 2 IrO $$_4$$ 4 and a large one in Sr $$_3$$ 3 Ir $$_2$$ 2 O $$_7$$ 7 . We use angle-resolved photoemission to study the evolution of the spectral lineshape through the magnetic transition. We use Ru and La substitutions to tune $$T_N$$ T N and discriminate changes due to temperature from those due to magnetic order. We evidence a shift and a transfer of spectral weight in the gap at $$T_N$$ T N in Sr $$_3$$ 3 Ir $$_2$$ 2 O $$_7$$ 7 , which is absent in Sr $$_2$$ 2 IrO $$_4$$ 4 . We assign this behavior to a significantly larger coherent contribution to the spectral lineshape in Sr $$_3$$ 3 Ir $$_2$$ 2 O $$_7$$ 7 , which evolves strongly at $$T_N$$ T N . On the contrary, the Sr $$_2$$ 2 IrO $$_4$$ 4 lineshape is dominated by the incoherent part, which is insensitive to $$T_N$$ T N . We compare these findings to theoretical expectations of the Slater vs Mott antiferromagnetism within dynamical mean field theory. Graphic Abstract

Date: 2023
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DOI: 10.1140/epjb/s10051-023-00512-3

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