A variable temperature study of the crystal and magnetic structures of the giant magnetoresistant materials LnMnAsO (Ln = La, Nd)

Abstract

A variable temperature neutron and synchrotron diffraction study have been performed on the giant magnetoresistant oxypnictides LnMnAsO (Ln = La, Nd). The low temperature magnetic structures have been studied and results show a spin reorientation of the Mn2+ spins below TN (Nd) for NdMnAsO. The Mn2+ spins rotate from alignment along c to alignment into the basal plane and the Mn2+ and Nd3+ moments refine to 3.54(4) μB and 1.93(4) μB respectively at 2 K. In contrast there is no change in magnetic structure with temperature for LaMnAsO. There is no evidence of a structural transition down to 2 K, however discontinuities in the cell volume, Ln-O and Mn-As bond lengths are detected at \sim 150 K for both materials. This temperature coincides with the electronic transition previously reported and suggests a coupling between electronic and lattice degrees of freedom.

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Cited by in corpus (31)

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• Analysis of model parameter dependences on the second-order nonlinear conductivity in $\mathcal{P}\mathcal{T}$-symmetric collinear antiferromagnetic metals with magnetic toroidal moment on zigzag chains
• Symmetry analysis of current-induced switching of antiferromagnets
• Short- and long-range magnetic order in LaMnAsO
• Colossal Magnetoresistance in the Mn2+ Oxypnictides NdMnAsO1-xFx
• Crystal, magnetic, and electronic structures, and properties of new BaMnPnF (Pn = As, Sb, Bi)
• Spin reorientation and Ce-Mn coupling in antiferromagnetic oxypnictide CeMnAsO
• Insulator-to-metal transition and large thermoelectric effect in La${}_{1-x}$Sr${}_x$MnAsO
• Magnetic Effects in the Paraxial Regime of Elastic Electron Scattering
• A Magnetic Transition Probed by the Ce Ion in Square-Lattice Antiferromagnet CeMnAsO
• The suppression of Curie temperature by Sr doping in diluted ferromagnetic semiconductor (La1-xSrx)(Zn1-yMny)AsO
• Structure and magnetic properties of {\it Ln}MnSbO ({\it Ln} = La and Ce) and CeMnAsO
• Importance of effective dimensionality in manganese pnictides
• (Sr3La2O5)(Zn1-xMnx)2As2: A Bulk Form Diluted Magnetic Semiconductor isostructural to the "32522" Fe-based Superconductors
• The synthesis and characterization of 1111-type diluted magnetic semiconductors (La1-xSrx)(Zn1-xTMx)AsO (TM = Mn, Fe, Co)
• Tuning quantum transport by controlling spin reorientations in Dirac semimetal candidates Eu${}_{1-x}$Sr${}_x$MnSb${}_2$
• Possible Superconductivity in Electron-doped Chromium Pnictide LaOCrAs
• Absence of Colossal Magnetoresistance in the Oxypnictide PrMnAsO0.95F0.05
• First Principles Study of the Magnetic Properties of LaOMnAs
• Iron spin-reorientation transition in NdFeAsO
• The Electronic and Magnetic Properties of Magnetoresistant Nd1-xSrxMnAsO Oxyarsenides
• Competing magnetic phases and field-induced dynamics in DyRuAsO
• Thermopower of the electron-doped manganese pnictide LaMnAsO
• Spin Dynamics in the Antiferromagnetic Oxypnictides and Fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF
• Large thermopower in the antiferromagnetic semiconductor BaMn${}_2$Bi${}_2$
• Common effect of chemical and external pressures on the magnetic properties of $R$CoPO ($R$ = La, Pr, Nd, Sm). II
• Simulations of magnetic Bragg scattering in transmission electron microscopy
• A High Pressure Neutron Study of Colossal Magnetoresistant NdMnAsO0.95F0.05
• Enhanced Itinerant Ferromagnetism in Hole-doped Transition Metal Oxides: Beyond the Canonical Double Exchange Mechanism