Short and Long Range Magnetic Ordering in β-MnO_2 : A Temperature Study(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• The magnetic long range ordering (LRO) and short range ordering (SRO) in β-MnO_2 has been studied by neutron powder diffraction. Below T_N=92.5 (1) K β-MnO_2 has an incommensurate modulated magnetic LRO with temperature dependent propagation vector length k_z. The values of k_z show a maximum, corresponding to k_z=(2/7)+0.0120 (1), near 90 K. The c lattice constant has a minimum near T_N. The temperature dependence of the ordered magnetic moment shows a critical behavior M (T) α (T_N-T)^β with β=0.18 (2). β-MnO_2 has also a magnetic SRO from 50 up to 300 K as conjectured by Sato et al. [Phys Rev B 61 (2000) 3563]. The SRO magnetic correlation length of about 9.5 (1.0) Å do not change with temperature. The Q-position of the SRO contribution decrease by 20% on warming from 50 to 300 K.

• 社団法人日本物理学会の論文
• 2004-12-15

著者

• Sosnowska Izabela

  Institute Of Experimental Physics University Of Warsaw

• PRZENIOSLO Radoslaw

  Institute of Experimental Physics, University of Warsaw

• REGULSKI Marcin

  Institute of Experimental Physics, Warsaw University

• HOFFMANN Jens-Uwe

  Hahn Meitner Institut

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