Study of short range correlations and two-fold spin reorientation in NdFe0.5Mn0.5O3

Ankita Singh; B Padmanabhan; Ruchika Yadav; Vivian Nassif; V K Malik

doi:10.1088/1361-648X/ab8499

Study of short range correlations and two-fold spin reorientation in NdFe_0.5Mn_0.5O₃

J Phys Condens Matter. 2020 May 11;32(31). doi: 10.1088/1361-648X/ab8499.

Authors

Ankita Singh¹, B Padmanabhan², Ruchika Yadav³, Vivian Nassif^{4

5}, V K Malik¹

Affiliations

¹ Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India.
² Graphic Era University, Dehra Dun, Uttarakhand 248002, India.
³ Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
⁴ Université Grenoble-Alpes, CNRS, Institut Néel, 25 Avenue des Martyrs- BP166, 38042 Grenoble, Cedex 9 France.
⁵ Institute Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, Cedex 9 France.

PMID: 32224517
DOI: 10.1088/1361-648X/ab8499

Abstract

Detailed powder neutron diffraction studies as a function of temperature is performed on NdFe_0.5Mn_0.5O₃in the temperature range 400-1.5 K. Diffused magnetic scattering is observed due to three dimensional short range ordering (SRO), between Fe³⁺/Mn³⁺spins, over the whole temperature range 400-1.5 K. The presence of SRO is independent of long range ordering (LRO) in this compound which has never been observed in any Fe³⁺/Mn³⁺based compounds. Further, in this compound two-fold spin reorientation is discussed in the temperature range 300-1.5 K. Development of long range ordering at 300 K is due to the mixture of Γ₄and Γ₁magnetic structure, not like other orthoferrites which have Γ₄structure at 300 K. This occurs due to the presence of large single ion anisotropy of Mn³⁺ions. Volume fraction of Γ₄decreases with temperature leading to pure Γ₁magnetic structure in the temperature range 150-90 K. Another spin reorientation of Fe³⁺/Mn³⁺spins occurs from Γ₁to Γ₂in the temperature range 70-25 K.

Keywords: diffuse scattering; magneto-elastic effect; orthoferrites; short range ordering; spin reorientation.