A 169Tm-Mössbauer spectroscopy investigation of orthorhombic phase

✍ Scribed by H.A. Salama; G.A. Stewart; W.D. Hutchison; K. Nishimura; D.R. Scott; H. StC. O’Neill

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 918 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2009.11.002

✦ Synopsis

AC susceptibility and specific heat measurements confirm that the Mn sub-lattice of o-TmMnO 3 orders at T Mn N ≈ 41 K with a weaker feature at T C ≈ 32 K. 169 Tm-Mössbauer spectra are interpreted in terms of a single, asymmetric, quadrupole-split doublet whose line width increases sharply at T C . This suggests the presence of a weak induced Tm-site moment, consistent with claims that the Mn sub-lattice magnetism undergoes a transition from incommensurate to collinear antiferromagnetic order at this temperature.