Seebeck Coefficient Measurement and Its Narrow Band Model Interpretation in FeTe0.5Se0.5 Superconductor

被引：2

作者：

Lodhi, Pavitra Devi ^{[1
]}

Kaurav, Netram ^{[1
]}

Choudhary, K. K. ^{[2
]}

Kuo, Y. K. ^{[3
]}

机构：

[1] Govt Holkar Sci Coll, Dept Phys, Indore 452001, Madhya Pradesh, India

[2] Indian Mil Acad, Army Cadet Coll, Dehra Dun 248007, Uttarakhand, India

[3] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2018年 / 31卷 / 09期

关键词：

Seebeck coefficient; Narrow band model;

D O I：

10.1007/s10948-018-4764-y

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have measured Seebeck coefficient (S) of FeTe0.5Se0.5 superconducting sample from 10 to 300 K. The variation of Seebeck coefficient with temperature of this system was found to be very anomalous, and the overall experimental observation of the S(T) was studied in the outline of a narrow-band model. In high-temperature region, the Seebeck coefficient is almost independent of temperature. Further, from the study of high-temperature magnitude of S, sample undergoes a change in sign in the Seebeck coefficient, wherein, appearance of a negative peak around 22 K and subsequently, its Seebeck coefficient goes to zero in the superconducting transition temperature regime around 11 to 13 K. It is revealed that the bandwidth and a small asymmetry involved in narrow bands give a realistic explanation to the anomalous temperature dependence of Seebeck coefficient of FeTe0.5Se0.5 system.

引用

页码：2671 / 2676

页数：6

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