Heisenberg spins on an anisotropic triangular lattice : PdCrO2 under uniaxial stress
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When Heisenberg spins interact antiferromagnetically on a triangular lattice and nearest-neighbor interactions dominate, the ground state is 120° antiferromagnetism. In this work, we probe the response of this state to lifting the triangular symmetry, through investigation of the triangular antiferromagnet PdCrO2 under uniaxial stress by neutron diffraction and resistivity measurements. The periodicity of the magnetic order is found to change rapidly with applied stress; the rate of change indicates that the magnetic anisotropy is roughly forty times the stress-induced bond length anisotropy. At low stress, the incommensuration period becomes extremely long, on the order of 1000 lattice spacings; no locking of the magnetism to commensurate periodicity is detected. Separately, the magnetic structure is found to undergo a first-order transition at a compressive stress of ∼0.4 GPa, at which the interlayer ordering switches from a double-to a single-q structure.
Sun , D , Sokolov , D A , Waite , R , Khim , S , Manuel , P , Orlandi , F , Khalyavin , D D , Mackenzie , A P & Hicks , C W 2021 , ' Heisenberg spins on an anisotropic triangular lattice : PdCrO 2 under uniaxial stress ' , New Journal of Physics , vol. 23 , no. 12 , 123050 . https://doi.org/10.1088/1367-2630/ac4280
New Journal of Physics
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DescriptionExperiments at the ISIS Pulsed Neutron and Muon Source were supported by a beam time allocation from the Science and Technology Facilities Council under Expt. No. RB1820290. Financial support from the Deutsche Forschungsgemeinschaft through SFB 1143 (Project ID 247310070) and the Max Planck Society is gratefully acknowledged. RW acknowledges funding from the Engineering and Physical Sciences Research Council (EPSRC) Centre for Doctoral Training in Condensed Matter Physics (CDT-CMP), Grant No. EP/L015544/1.
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