Examining the surface phase diagram of ${\mathrm{IrTe}}_{2}$ with photoemission

Rumo, Maxime; Nicholson, Christopher W.; Pulkkinen, Aki; Hildebrand, Baptiste; Kremer, Geoffroy; Salzmann, Björn; Mottas, Marie-Laure; Ma, K. Y.; Wong, E. L.; Man, M. K. L.; Dani, K. M.; Barbiellini, B.; Muntwiler, Matthias; Jaouen, Thomas; Rohr, Fabian O. von; Monney, Claude

doi:10.1103/PhysRevB.101.235120

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Journal article

Examining the surface phase diagram of ${\mathrm{IrTe}}_{2}$ with photoemission

Rumo, Maxime Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
Nicholson, Christopher W. Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
Pulkkinen, Aki Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland - School of Engineering Science, LUT University, FI-53850, Lappeenranta, Finland
Hildebrand, Baptiste Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
Kremer, Geoffroy Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
Salzmann, Björn Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
Mottas, Marie-Laure Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
Ma, K. Y. Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland
Wong, E. L. Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami, Okinawa 904-495, Japan
Man, M. K. L. Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami, Okinawa 904-495, Japan
Dani, K. M. Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami, Okinawa 904-495, Japan
Barbiellini, B. School of Engineering Science, LUT University, FI-53850, Lappeenranta, Finland - Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
Muntwiler, Matthias Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Jaouen, Thomas Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland
Rohr, Fabian O. von Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland
Monney, Claude Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland

04.06.2020

Published in:

Physical Review B. - 2020, vol. 101, no. 23, p. 235120

English In the transition metal dichalcogenide IrTe2, low-temperature charge-ordered phase transitions involving Ir dimers lead to the occurrence of stripe phases of different periodicities, and nearly degenerate energies. Bulk-sensitive measurements have shown that, upon cooling, IrTe2 undergoes two such first-order transitions to (5×1×5) and (8×1×8) reconstructed phases at Tc1∼280 K and Tc2∼180 K, respectively. Here, using surface sensitive probes of the electronic structure of IrTe2, we reveal the first- order phase transition at Tc3=165 K to the (6×1) stripes phase, previously proposed to be the surface ground state. This is achieved by combining x-ray photoemission spectroscopy and angle-resolved photoemission spectroscopy, which give access to the evolution of stripe domains and a particular surface state, the energy of which is dependent on the Ir dimer length. By performing measurements over a full thermal cycle, we also report the complete hysteresis of all these phases.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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