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arXiv 0807.3087cond-mat.supr-concond-mat.mtrl-sci
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用点接触Andreev反射光谱研究Ni3Al的自旋涨落

Study of spin fluctuations in Ni3Al using point contact Andreev reflection spectroscopy

Sourin Mukhopadhyay, Sudesh Kumar Dhar, Pratap Raychaudhuri

摘要:

本文报道了Ni_3Al合金的点接触Andreev反射光谱(PCAR)研究。固溶体中Al的%)跨越铁磁性到顺磁性相边界。用铌尖作对电极的PCAR研究表明,在正常金属电极中,超导准粒子寿命(\tao)和超导能隙(δ)随自旋涨落的增加而减小.我们的研究表明,PCAR可能是一个有用的探针,研究系统的自旋涨落的边缘的磁不稳定性。

英文摘要:

We report point contact Andreev reflection (PCAR) spectroscopy studies on Ni3Al with composition range (24, 26 and 27 at. % of Al in the solid solution) spanning the ferromagnetic to paramagnetic phase boundary. PCAR studies performed using Nb tip as counter electrode reveal that the superconducting quasiparticle lifetime (\tao) and superconducting energy gap (δ) decreases with increasing spin fluctuation in the normal metal electrode. Our study reveals that PCAR could be a useful probe to study spin fluctuations in systems which are on the verge of a magnetic instability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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