A Neutron Scattering Study of the H-T Phase Diagram of the Bond Frustrated ZnCr2S4

D. Hsieh , Y. W. Li , S. Watauchi , Chang Liu , Q. Huang , R. J. Cava , J. W. Lynn , M. Z. Hasan

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classification ❄️ cond-mat.str-el

keywords phasespinwavebelowbonddiagramfieldfrustrated

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Detailed neutron scattering measurements on the bond frustrated magnet ZnCr2S4 reveal a rich H-T phase diagram. The field dependence of the two subsequent antiferromagnetic transitions follows closely that of recently reported structural instabilities, providing further evidence for spin driven Jahn-Teller physics. The incommensurate helical ordered phase below TN1 = 15.5 K exhibits gapless spin wave excitations, whereas a spin wave gap (about 2 meV) opens below TN2 = 8 K as the system undergoes a first-order transition to a commensurate collinear ordered phase. The spin wave gap is closed by a strong magnetic field.

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A Neutron Scattering Study of the H-T Phase Diagram of the Bond Frustrated ZnCr2S4

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