High-Pressure 57Fe Mossbauer Spectroscopy of LaFeAsO

被引：17

作者：

Kawakami, Takateru ^{[1
]}

Kamatani, Takanori ^{[2
]}

Okada, Hironari ^{[3
,4
]}

Takahashi, Hiroki ^{[3
,4
]}

Nasu, Saburo ^{[5
]}

Kamihara, Yoichi ^{[6
]}

Hirano, Masahiro ^{[6
]}

Hosono, Hideo ^{[6
]}

机构：

[1] Nihon Univ, Inst Quantum Sci, Chiyoda Ku, Tokyo 1018308, Japan

[2] Nihon Univ, Grad Sch Sci & Technol, Chiyoda Ku, Tokyo 1018308, Japan

[3] Nihon Univ, Coll Humanities & Sci, Dept Phys, Setagaya Ku, Tokyo 1568550, Japan

[4] JST, Transformat Res Project Iron Pnictides TRIP, Chiyoda Ku, Tokyo 1020075, Japan

[5] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan

[6] Tokyo Inst Technol, Frontier Res Ctr, JST, ERATO SORST, Yokohama, Kanagawa 2268503, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 12期

关键词：

LaFeAsO; high pressure; Fe-57 Mossbauer spectroscopy; electrical resistance; superconductivity; magnetism; LAO1-XFXFEAS; SUPERCONDUCTIVITY;

D O I：

10.1143/JPSJ.78.123703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electronic properties of ail oxypnictide, LaFeAsO, pressurized in a diamond-anvil cell, were investigated by 57 Fe Mossbauer spectroscopy and electrical resistance measurements at pressures up to 24 and 35 GPa, respectively. The Neel temperature gradually decreased from similar to 140 K at 0.1 MPa to similar to 50 K at 20 GPa, and fell below 8 K or disappeared at 24 GPa. The hyperfine field at 8 K decreased from 5.3 T at 0.1 MPa to 2.2 T at 20 GPa. On the other hand, the onset of superconductivity occurred at similar to 9 K at 2GPa. The superconductivity peaked at similar to 21 K at 12GPa, and then began a perceptible decline, disappearing at similar to 35 GPa. This Suggests that suppression of antiferromagnetic order plays an important role in the emergence of pressure-induced superconductivity.

引用

页数：4

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