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Giant magnetoacoustic effect in KMnF_3 due to nuclear spin waves

机译:核自旋波在KMnF_3中产生巨大的磁声效应

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摘要

An explanation is proposed for the gigantic magnetoacoustic effect that we observed in KMnF_3 in previous work {Kh. G. Bogdanova, V. A. Golenishchev-Kutuzov, M. I. Kurkin et al., Zh. Eksp. Teor. Fiz. 112, 1830 (1997) [JETP 85, 1001 (1997)]}.The effect entails a tenfold amplitude reduction of an acoustic pulse in a magnetic field that varies over the range 0-8 kOe. It is shown that this effect is due to the interference of two nuclear magnetoelastic waves propagating in the sample under magnetoacoustic resonance conditions, if this resonance occurs in the region of strong spatial dispersion of nuclear spin waves. The effect is said to be gigantic because it exceeds in magnitude the magnetoacoustic effects observed previously in magnetically ordered materials even though it is due to nuclear magnetism, which is 10~5 times weaker than electronic magnetism. We observe a concomitant anomalous dependence of the dispersion of the velocity of sound on the external magnetic field.
机译:对于先前我们在KMnF_3中观察到的巨大磁声效应,提出了一种解释。 G. Bogdanova,V。A. Golenishchev-Kutuzov,M。I. Kurkin等,Zh。 Eksp。蒂尔菲兹[JETP 85,1001(1997)],第112卷,第1830页,1997年。}该效果导致在0-8 kOe范围内变化的磁场中,声脉冲的幅度减小了十倍。结果表明,这种影响是由于在磁声共振条件下在样品中传播的两个核磁弹性波的干扰所致,如果该共振发生在核自旋波的强空间色散区域中。这种作用之所以被认为是巨大的,是因为尽管它是由于核磁所致,但其幅度超过了磁性有序材料中先前所观察到的磁声效应,而核磁的强度比电子磁致弱十至五倍。我们观察到声速的色散对外部磁场的伴随异常关系。

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