Role of local short-scale correlations in the mechanism of negative magnetization

Abstract

We elaborate here why the antiferromagnetically ordered GdCrO${}_3$ responds in a diamagnetic way under certain conditions, by monitoring the evolution of the microscopic global and local magnetic phases. Using high energy $\sim$ 0.3 eV neutrons, the magnetic ordering is shown to adopt three distinct magnetic phases at different temperatures: G${}_x^{Cr}$,A${}_y^{Cr}$,F${}_z^{Cr}$ below Néel temperature = 171 K; (F${}_x^{Cr}$, C${}_y^{Cr}$, G${}_z^{Cr}$)$\bullet$( F${}_x$${}^{Gd}$,C${}_y$${}^{Gd}$) below 7 K and an intermediate phase for 7 K $\le T\le$ 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 ( $M_{-max}$ ( 18 K)$\sim$ 35 $\times M_{+max}$ (161 K), $\Delta T\sim 110$ K in presence of ${\mu }_{0}H$ = 0.01 T); the long-range magnetic structure and derived ordered moments are unable to explain the NM. Real-space analysis of the total (Bragg's + diffuse) scattering reveals significant magnetic correlations extending up to $\sim$ 9 $\mathring{A}$. 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 J${}_1$ = 2.3 K, J${}_2$ = -1.66 K and J${}_3$ = 2.19 K in presence of internal field, governs the observance of NM in GdCrO${}_3$.

arXiv comment11 pages, 8 figures

References in corpus (6)

• Magnetic structure determination from the magnetic pair distribution function (mPDF): ground state of MnO
• Tunable temperature induced magnetization jump in a GdVO3 single crystal
• Negative magnetization of Li2Ni2Mo3O12 having a spin system composed of distorted honeycomb lattices and linear chains
• A Kinetic Model for Photoswitching of magnetism in the High Spin Molecule [Mo(IV)(CN)2(CN-Cu(II)(tren))6](ClO4)8
• A Theoretical Approach for Computing Magnetic Anisotropy in Single Molecule Magnets
• Polarized single crystal neutron diffraction study of the zero-magnetization ferromagnet Sm${}_{1-x}$Gd${}_x$Al${}_2$ (x = 0.024)

Cited by in corpus (6)

• Enhanced magnetocaloric effect and magnetic phase diagrams of single-crystal GdCrO${}_3$
• Mapping the magnetic state as a function of anti-site disorder in Sm${}_2$NiMnO${}_6$ double perovskite thin films
• Microscopic insights of magnetism in Sm${}_2$NiMnO${}_6$ double perovskite
• DIFFPY.MPDF: Open-source software for magnetic pair distribution function analysis
• Magnetic Pair Distribution Function Data Using Polarized Neutrons and ad hoc Corrections
• Anisotropic magnetic phase diagrams, tricriticality, and spin-reorientation in high-pressure grown SmCrO${}_3$ single crystals