Volume magnetostriction at the AF–FRI metamagnetic transition in the itinerant-electron system Mn2−xTxSb (T=Co, Cr)
✍ Scribed by M.I Bartashevich; T Goto; N.V Baranov; V.S Gaviko
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 255 KB
- Volume
- 351
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
Mn 2 Sb is a ferrimagnet, and substitution of Co or Cr for Mn above the critical concentration results in the appearance of a spontaneous first-order magnetic phase transition from ferrimagnetic (FRI) to antiferromagnetic (AF) with decreasing temperature below T t . At ToT t a first-order field-induced AF-FRI transition is observed at a critical field B c : The spontaneous as well as the field induced AF-FRI transition is accompanied by a significant magnetovolume effect. Magnetization under high pressure up to 12 kbar, magnetostriction of Mn 1.8 Co 0.2 Sb and Mn 1.94 Cr 0.04 Sb as well as thermal expansion of the Mn 1Àx Co x Sb system has been measured in order to clarify the origin of the contradictory experimental results on the pressure effect on B c and that on T t ; implying opposite changes. The observed differences are explained by the found anomalous change of sign of the magnetovolume effect at the AF-FRI transition with decreasing temperature.