As-NMR/NQR study of pressure-induced superconductivity in CaFe2As2

被引：5

作者：

Kawasaki, S. ^{[1
]}

Oka, T. ^{[1
]}

Tabuchi, T. ^{[1
]}

Wang, X. F. ^{[2
,3
]}

Chen, X. H. ^{[2
,3
]}

Zheng, Guo-qing ^{[1
,4
,5
]}

机构：

[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan

[2] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[4] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[5] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2011年 / 72卷 / 05期

关键词：

Nuclear magnetic resonance; Nuclear quadrupole resonance; Superconductivity; SPIN-SINGLET SUPERCONDUCTIVITY; UNCONVENTIONAL SUPERCONDUCTIVITY; ANTIFERROMAGNETIC ORDER; GAPS; FLUCTUATIONS;

D O I：

10.1016/j.jpcs.2010.10.010

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

As-75-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe2As2 under pressure. At P=4.7 and 10.8 kbar, the temperature dependence of nuclear-spin-lattice relaxation rate (1/T-1) measured at tetragonal phase show no coherence peak just below T-c and decrease with decreasing temperature. The superconductivity is of gapless at P=4.7 kbar but evolves to multiple gaps at P=10.8 kbar. We find that the superconductivity appears near a quantum critical point. Both electron correlation and superconductivity disappear in the collapsed tetragonal phase. A systematic study under pressure indicates that electron correlations play a vital role in forming Cooper pairs in this compound. (C) 2010 Elsevier Ltd. All rights reserved.

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页码：501 / 504

页数：4

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