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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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MA: Fachverband Magnetismus

MA 62: Disodered Magnetic Materials

MA 62.7: Talk

Friday, March 20, 2020, 11:00–11:15, HSZ 401

Local short-scale correlations and the origin of pseudo-diamagnetism — •Malvika Tripathi1, T. Chatterji2, H. E. Fischer2, R. J. Choudhary1, and D. M. Phase11UGC-DAE Consortium for Scientific Research,Indore-452001, India — 2Institut Laue-Langevin, 38042 GRENOBLE Cedex, France

Here we describe why the antiferromagnetically ordered GdCrO3 behave in a diamagnetic way under certain conditions, by monitoring the evolution of the microscopic global and local magnetic phases. High energy neutron diffraction reveals that magnetic ordering comprises three distinct magnetic phases at different temperatures: GxCr,AyCr,FzCr below Néel temperature = 171 K; (FxCr, CyCr, GzCr)•( FxGd,CyGd) below 7 K and an intermediate phase for 7 K ≤ T ≤ 20 K in the vicinity of spin-reorientation phase transition. Although, bulk magnetometry reveals a huge negative magnetization (NM) in the terms of both magnitude and temperature range; the long-range magnetic structure and derived ordered moments remain silent about any signature of NM. Real-space analysis of the total scattering suggests significant magnetic correlations extending up to ∼ 9 Å. Accounting for these short-range correlations with a spin model reveals spin frustration in the S= 3 ground state, comprising competing first, second and third next nearest exchange interactions with values J1 = 2.3 K, J2 = -1.66 K and J3 = 2.19 K in presence of internal field, governs the observance of NM in GdCrO3.

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