Application of Multi-Extreme THz ESR to Understand the Pressure-Induced Phase Transition in the Shastry-Sutherland Model Substance SrCu2(BO3)2

Datum

08.11.2024

Zeit

13:00 - 14:00

Sprecher

Prof. Hitoshi Ohta

Zugehörigkeit

Molecular Photoscience Research Center, Kobe University

Sprache

en

Hauptthema

Materialien

Host

Rita Taubert

Beschreibung

We have been developing THz ESR under multi-extreme conditions, such as high magnetic field, high pressure and low temperature in Kobe. It covers the frequency region between 0.03 and 7 THz,1 the temperature region between 1.8 and 300 K,1 the magnetic field region up to 55 T,1 and the pressure region is extended from 1.5 GPa2 to 2.5 GPa using the hybrid-type piston-cylinder pressure cell.3 It also includes mechanically detected ESR4 measurements using a commercially available membrane-type surface stress sensor, which is the extension from our micro-cantilever ESR5. As an example, application of high pressure THz ESR to understand the pressure-induced phase transition in the Shastry-Sutherland model substance SrCu2(BO3)2 will be discussed. Using our technique, we were able to determine the pressure where the pressure-induced phase transition occurs, and obtain the pressure dependence of exchange interactions in SrCu2(BO3)26. Comparison of our results with the theory will be discussed.

Links

• Seminars at the IFW

Letztmalig verändert: 08.11.2024, 12:57:07