High Pressure Effect on the Superconductivity in VN

被引：4

作者：

Wang, Bosen ^{[1
]}

Matsubayashi, Kazuyuki ^{[1
]}

Uwatoko, Yoshiya ^{[1
]}

Ohgushi, Kenya ^{[2
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[2] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2015年 / 84卷 / 10期

关键词：

SPIN FLUCTUATIONS; VANADIUM NITRIDE; TRANSITION; TEMPERATURE; RESISTIVITY; FILMS;

D O I：

10.7566/JPSJ.84.104706

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We revisited the superconductivity in a vanadium-based superconductor VNx with a special focus on its high-pressure effect. We found that the electronic specific heat at low temperature follows a single gap BCS-type function, indicating the s-wave symmetry of superconducting gap. We also revealed that the superconducting transition temperature (T-c) enhances as the pressure increases up to 8 GPa, giving a positive differential pressure coefficient of 0.09K=GPa. The enhancement of T-c was discussed in terms of the suppressed spin fluctuations, and the phonon softening.

引用

页数：4

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