Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: Frustrated Magnets - Iridates and Fe-based Materials

TT 47.2: Vortrag

Mittwoch, 14. März 2018, 09:45–10:00, H 0104

Coexistence of static and dynamic magnetism in pressurized β-Li₂IrO₃ — •Mayukh Majumder¹, Rudra Sekhar Manna¹, Gediminas Simutis², Jean-Christophe Orain², Tusharkanti Dey¹, Friedrich Freund¹, Rustem Khasanov², Pabitra Kumar Biswas³, Alexander Tsirlin¹, and Philipp Gegenwart¹ — ¹EP-VI, EKM, University of Augsburg, Germany — ²PSI, Villigen, Switzerland — ³ISIS, Rutherford Appleton Laboratory, United Kingdom

Frustrated systems with Kitaev-type exchanges show long-range magnetic ordering instead of quantum spin liquid state because of the presence of other exchanges. Interestingly, theoretical studies suggest the possibility of tuning β-Li₂IrO₃ towards a QSL state by applying pressure. In order to establish the temperature-pressure phase diagram in β-Li₂IrO₃ we have used magnetization, thermal expansion, magnetostriction and µSR measurements. Our comprehensive study established - i) a weak increase of ordering temperature (T_MO) up to the pressure of about 14 kbar without showing any detectable change in the magnetic moment and in the nature of ordered state compared to ambient pressure, ii) above 14 kbar, T_MO sharply drops showing a first-order like behavior, iii) magnetic phase separation occurs above 14 kbar where static and dynamic spins coexist.