Superconducting vortices carrying a temperature-dependent fraction of the flux quantum

被引：22

作者：

Iguchi, Yusuke ^{[1
,2
]}

Shi, Ruby A. A. ^{[1
,2
,3
]}

Kihou, Kunihiro ^{[4
]}

Lee, Chul-Ho ^{[4
]}

Barkman, Mats ^{[5
]}

Benfenati, Andrea L. L. ^{[5
]}

Grinenko, Vadim ^{[6
]}

Babaev, Egor ^{[5
]}

Moler, Kathryn A. A. ^{[1
,2
,3
,7
]}

机构：

[1] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[2] Stanford Inst Mat & Energy Sci, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[3] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[4] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[5] Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden

[6] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 201210, Peoples R China

[7] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

来源：

SCIENCE | 2023年 / 380卷 / 6651期

基金：

瑞典研究理事会;

关键词：

MAGNETIC-FLUX; INTEGER;

D O I：

10.1126/science.abp9979

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Magnetic field penetrates type-II bulk superconductors by forming quantum vortices that enclose a magnetic flux equal to the magnetic flux quantum. The flux quantum is a universal quantity that depends only on fundamental constants. In this study, we investigated isolated vortices in the hole-overdoped Ba1-xKxFe2As2 (x = 0.77) by using scanning superconducting quantum interference device (SQUID) magnetometry. In many locations, we observed objects that carried only part of a flux quantum, with a magnitude that varied continuously with temperature. We demonstrated mobility and manipulability of these objects and interpreted them as quantum vortices with nonuniversally quantized (fractional) magnetic flux whose magnitude is determined by the temperature-dependent parameters of a multicomponent superconductor.

引用

页码：1244 / 1247

页数：4

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