Glassy magnetic state and negative temperature coefficient of resistivity in Mn_(3+δ)In

Snehashish Chatterjee; Prabir Dutta; Saurav Giri; Subham Majumdar; Surasree Sadhukhan; Sudipta Kanungo; Souvik Chatterjee; Manju Mishra Patidar; Gunadhor Singh Okram; V. Ganesan

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Glassy magnetic state and negative temperature coefficient of resistivity in Mn_(3+δ)In

机译：Mn_（3 +δ）中玻璃磁状态和负温度的电阻率系数

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The complex metallic alloy Mn_3In has recently attracted attention for being a probable candidate for the fully compensated half-metallic ferrimagnet. The compound is associated with a rather unusual negative coefficient of resistivity approximately above the ferrimagnetic, T_C = 80 K. Our investigation indicates that that the ground state of the alloy is spin-glass like, which possibly coexists with the ferrimagnetic state. The carrier density obtained from the Hall-effect measurement shows a jump below T_C; afterward, it gradually increases with lowering temperature and shows a saturating tendency at the lowest temperature. The electronic structure calculations indicate that, at the Fermi energy, dominant contributions come from minority-spin channels with larger bandwidth. In contrast, very weak but nonzero states arise from the majority-spin channel, and half metallicity can be ruled out. The calculations also found that the antiferromagnetic alignment of Mn spins with nonzero resultant magnetic moment confirms the ferrimagnetic nature consistent with the experimental results. The high-temperature phase with negative temperature coefficient of resistivity can be related to the localization of charge carriers through electron-phonon interactions.

机译：复杂的金属合金MN_3IN最近引起了适用于完全补偿的半金属Ferrimagnet的可能候选者。该化合物与大致高于Ferrimagnetic，T_C = 80K的相当异常的负电阻率相关。我们的研究表明，合金的地面状态是旋转玻璃，其可能与亚铁磁性状态共存。从霍尔效应测量获得的载流子密度显示出低于T_C的跳跃;之后，它随着温度降低而逐渐增加，并显示在最低温度下的饱和趋势。电子结构计算表明，在费米能量下，主导贡献来自少数纺丝通道，带宽较大。相反，非常弱但非零态来自多数旋转通道，可以排除半金属性。该计算还发现Mn Spins与非零合金磁矩的反铁磁对准证实了与实验结果一致的亚铁磁性。具有负温度的电阻率系数的高温相可以与通过电子 - 声子相互作用的电荷载体定位有关。

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《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214443.1-214443.12|共12页
作者
Snehashish Chatterjee; Prabir Dutta; Saurav Giri; Subham Majumdar; Surasree Sadhukhan; Sudipta Kanungo; Souvik Chatterjee; Manju Mishra Patidar; Gunadhor Singh Okram; V. Ganesan;
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School of Physical Sciences Indian Association for the Cultivation of Science 2A & B Raja S. C. Mullick Road Jadavpur Kolkata 700032 India;

School of Physical Sciences Indian Association for the Cultivation of Science 2A & B Raja S. C. Mullick Road Jadavpur Kolkata 700032 India Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India;

School of Physical Sciences Indian Association for the Cultivation of Science 2A & B Raja S. C. Mullick Road Jadavpur Kolkata 700032 India;

School of Physical Sciences Indian Association for the Cultivation of Science 2A & B Raja S. C. Mullick Road Jadavpur Kolkata 700032 India;

School of Physical Sciences Indian Institute of Technology Goa Ponda 403401 Goa India;

School of Physical Sciences Indian Institute of Technology Goa Ponda 403401 Goa India;

UGC-DAE Consortium for Scientific Research Kolkata Centre Sector Ⅲ LB-8 Salt Lake Kolkata 700106 India;

UGC-DAE Consortium for Scientific Research University Campus Khandwa Road Indore 452017 India Emerald Heights International School A.B. Road. Rau. Indore MP 453331 India;

UGC-DAE Consortium for Scientific Research University Campus Khandwa Road Indore 452017 India;

UGC-DAE Consortium for Scientific Research University Campus Khandwa Road Indore 452017 India;

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Glassy magnetic state and negative temperature coefficient of resistivity in Mn_(3+δ)In

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