ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The Tb〈sub〉2〈/sub〉Ti〈sub〉2〈/sub〉S〈sub〉2〈/sub〉O〈sub〉5〈/sub〉 compound belongs to the lanthanide titanium oxysulfides family Ln〈sub〉2〈/sub〉Ti〈sub〉2〈/sub〉S〈sub〉2〈/sub〉O〈sub〉5〈/sub〉. The 3D-structure can be schematically described as a 2D-stacking of [Tb〈sub〉2〈/sub〉S〈sub〉2〈/sub〉] layers alternating with [Ti〈sub〉2〈/sub〉O〈sub〉5〈/sub〉] ones. The magnetic structure of this compound was determined from neutron diffraction experiments on a powder sample in the 1.4 K - 15 K temperature range. An incommensurate antiferromagnetic long-range order (LRO) occurs at temperatures ranging from 4.1 K to 2.9 K, which turns to a commensurate state below 2.4 K. The evolution of the propagation vector from k〈sub〉i〈/sub〉, ⃗ (k〈sub〉x〈/sub〉,0,0), k〈sub〉x〈/sub〉 ≈ 0.46 to k〈sub〉c〈/sub〉, ⃗(1/2,0,1/2) is quite unusual. The origin of this unusualchange in direction of the propagation vector is not yet explained. On the other hand, a quite large part of the total magnetic moment is involved in a short range ordering (SRO). The refinement procedure taking into account the different coexisting magnetic phases leads to a smooth variation of the total magnetic moment versus temperature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.443-444.387.pdf
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