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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.45: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Magnetic phase diagram of the metallic triangular-lattice antiferromagnet PdCrO₂ — Jong Mok Ok¹, •M. Dietterle², J. Wosnitza², and Jun Sung Kim¹ — ¹Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea — ²Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany

Due to geometrical frustration, two-dimensional triangular-lattice antiferromagnets (TAFM) exhibit a variety of magnetic phases and transitions in an applied magnetic field [1]. The phase diagram becomes fantastically rich if magnetic anisotropy and competing first- and second-neighbor interactions come into play, as it is the case in many magnetic materials [2]. PdCrO₂ is a rare example of a metallic TAFM consisting of stacked layers of Pd and Cr triangular lattices in a delafossite structure. The localized S = 3/2 spins of the Cr³⁺ ions in the CrO₂ layer are expected to be AFM ordered in the 120-degree helical spin structure at T_N = 37.5 K. Previous de Haas-van Alphen experiments reveal a Fermi-surface reconstruction due to the AFM ordering, confirming the strong coupling between the itinerant electrons and the localized spins [3]. With torque magnetometry on single crystals in high pulsed magnetic fields up to 70 Tesla we investigate the phase diagram of PdCrO₂ and the influence of meta-magnetic transitions on the nature of coupled itinerant electrons.
L. Seabra et al., Phys. Rev. B 84, 214418 (2011)
L. Seabra et al., Phys. Rev. B 83, 134412 (2011)
Jong Mok Ok et al., Phys. Rev. Lett. 111, 176405 (2013)