Spin diffusion equation in superconductors in the vicinity of Tc

Takuya Taira, Masanori Ichioka, So Takei, Hiroto Adachi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We microscopically derive the spin diffusion equation in an s-wave superconductor in the vicinity of the superconducting transition temperature Tc. Applying the general relation between the relaxation function and the response function to the present spin diffusion problem, we examine how the spin relaxation time and the spin diffusion coefficient are renormalized in the superconducting state. The analysis reveals that, below Tc, both the spin relaxation time and the spin diffusion coefficient are increased, resulting in an enhancement of the spin diffusion length. The present result may provide an explanation for the recent observation of an enhanced spin pumping signal below Tc in a Py/Nb/Pt system that is free from the coherence peak effect.

Original languageEnglish
Article number214437
JournalPhysical Review B
Volume98
Issue number21
DOIs
Publication statusPublished - Dec 26 2018

Fingerprint

Superconducting materials
Relaxation time
diffusion coefficient
relaxation time
Superconducting transition temperature
diffusion length
pumping
transition temperature
augmentation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Spin diffusion equation in superconductors in the vicinity of Tc. / Taira, Takuya; Ichioka, Masanori; Takei, So; Adachi, Hiroto.

In: Physical Review B, Vol. 98, No. 21, 214437, 26.12.2018.

Research output: Contribution to journalArticle

@article{d43410662df343d0a5e15093c0f73936,
title = "Spin diffusion equation in superconductors in the vicinity of Tc",
abstract = "We microscopically derive the spin diffusion equation in an s-wave superconductor in the vicinity of the superconducting transition temperature Tc. Applying the general relation between the relaxation function and the response function to the present spin diffusion problem, we examine how the spin relaxation time and the spin diffusion coefficient are renormalized in the superconducting state. The analysis reveals that, below Tc, both the spin relaxation time and the spin diffusion coefficient are increased, resulting in an enhancement of the spin diffusion length. The present result may provide an explanation for the recent observation of an enhanced spin pumping signal below Tc in a Py/Nb/Pt system that is free from the coherence peak effect.",
author = "Takuya Taira and Masanori Ichioka and So Takei and Hiroto Adachi",
year = "2018",
month = "12",
day = "26",
doi = "10.1103/PhysRevB.98.214437",
language = "English",
volume = "98",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "21",

}

TY - JOUR

T1 - Spin diffusion equation in superconductors in the vicinity of Tc

AU - Taira, Takuya

AU - Ichioka, Masanori

AU - Takei, So

AU - Adachi, Hiroto

PY - 2018/12/26

Y1 - 2018/12/26

N2 - We microscopically derive the spin diffusion equation in an s-wave superconductor in the vicinity of the superconducting transition temperature Tc. Applying the general relation between the relaxation function and the response function to the present spin diffusion problem, we examine how the spin relaxation time and the spin diffusion coefficient are renormalized in the superconducting state. The analysis reveals that, below Tc, both the spin relaxation time and the spin diffusion coefficient are increased, resulting in an enhancement of the spin diffusion length. The present result may provide an explanation for the recent observation of an enhanced spin pumping signal below Tc in a Py/Nb/Pt system that is free from the coherence peak effect.

AB - We microscopically derive the spin diffusion equation in an s-wave superconductor in the vicinity of the superconducting transition temperature Tc. Applying the general relation between the relaxation function and the response function to the present spin diffusion problem, we examine how the spin relaxation time and the spin diffusion coefficient are renormalized in the superconducting state. The analysis reveals that, below Tc, both the spin relaxation time and the spin diffusion coefficient are increased, resulting in an enhancement of the spin diffusion length. The present result may provide an explanation for the recent observation of an enhanced spin pumping signal below Tc in a Py/Nb/Pt system that is free from the coherence peak effect.

UR - http://www.scopus.com/inward/record.url?scp=85059504774&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059504774&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.98.214437

DO - 10.1103/PhysRevB.98.214437

M3 - Article

AN - SCOPUS:85059504774

VL - 98

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 21

M1 - 214437

ER -