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Magnetisation reversal in Ca2PrCr2NbO9 and Ca2PrCr2TaO9
Journal of Solid State Chemistry ( IF 3.2 ) Pub Date : 2018-09-10 , DOI: 10.1016/j.jssc.2018.09.012
Emily C. Hunter , Simon Mousdale , Peter D. Battle , Maxim Avdeev

Polycrystalline samples of the perovskites Ca2PrCr2BO9 (B=Nb, Ta) have been synthesised using the standard ceramic method and characterized by x-ray diffraction, neutron diffraction and magnetometry. Both crystallise in the orthorhombic space group Pnma and exhibit magnetisation reversal when field-cooled in an applied field of 100 Oe. The absolute value of the negative magnetisation at 2 K in an applied field of 100 Oe is an order of magnitude greater in Ca2PrCr2TaO9 than it is for Ca2PrCr2NbO9. Magnetometry and powder neutron diffraction showed that the Cr3+ cations in Ca2PrCr2NbO9 and Ca2PrCr2TaO9 order in a GyFz magnetic structure below 110 and 130 K, respectively. The Pr3+ cations remain paramagnetic down to ~10 K and show no-long range order at 2 K. Both compounds show a large degree of hysteresis in M(H), with coercive fields of 3.79 kOe and 3.03 kOe at 2 K.



中文翻译:

Ca 2 PrCr 2 NbO 9和Ca 2 PrCr 2 TaO 9中的磁化反转

钙钛矿Ca 2 PrCr 2 B O 9B = Nb,Ta)的多晶样品已使用标准陶瓷方法合成,并通过X射线衍射,中子衍射和磁力分析进行了表征。两者均在正交晶体空间群Pnma中结晶,并且在100  Oe的施加磁场中进行场冷时表现出磁化反转。在Ca 2 PrCr 2 TaO 9中, 100  Oe的磁场中2 K时的负磁化强度的绝对值比在Ca 2 PrCr 2 NbO 9中的负磁化的绝对值大一个数量级。。磁力计和粉末中子衍射表明,Ca 2 PrCr 2 NbO 9和Ca 2 PrCr 2 TaO 9中的Cr 3+阳离子分别在低于110 K和130 K的G y F z磁性结构中有序。Pr 3+阳离子在低至〜10 K时仍保持顺磁性,并在2 K时无长程有序。这两种化合物在MH)中都显示出很大的磁滞,在2 K时的矫顽场为3.79 kOe和3.03 kOe 。      

更新日期:2018-09-11
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