75As NMR Study of Hole-Doped Superconductor Ba1-xKxFe2As2 (Tc ≃ 38 K)

被引：93

作者：

Fukazawa, Hideto ^{[1
,2
]}

Yamazaki, Takehiro ^{[1
]}

Kondo, Kenji ^{[1
]}

Kohori, Yoh ^{[1
,2
]}

Takeshita, Nao ^{[2
,3
]}

Shirage, Parasharam M. ^{[3
]}

Kihou, Kunihiro ^{[3
]}

Miyazawa, Kiichi ^{[3
,4
]}

Kito, Hijiri ^{[2
,3
]}

Eisaki, Hiroshi ^{[2
,3
]}

Iyo, Akira ^{[2
,3
,4
]}

机构：

[1] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[2] TRIP, JST, Chiyoda Ku, Tokyo 1020075, Japan

[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058562, Japan

[4] Tokyo Univ Sci, Dept Appl Elect, Chiba 2788510, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 03期

关键词：

Ba1-xKxFe2As2; superconductivity; magnetic order; phase separation; nuclear magnetic resonance;

D O I：

10.1143/JPSJ.78.033704

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the As-75 nuclear magnetic resonance (NMR) measurement of the hole doped superconductor Ba1-xKxFe2As2 with different lattice parameters and different superconducting volume fractions (T-c similar or equal to 38 K). As-75-NMR spectra revealed that the magnetically ordered and superconducting phases are microscopically separated. The spin-lattice relaxation rate 1/T-1 in the normal,late reflects the existence of a large two-dimensional antiferromagnetic spin fluctuation. The 1/T-1, in the Superconducting state down to the lowest measurement temperature T vailes close to T-3. In addition, it exhibits no coherence peak just below T-c. This shows a T dependence similar to those of other iron pnictides.

引用

页数：4

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