Crossover from vortex-to-fluctuation picture in the vast vortex-liquid state of cuprate superconductors La2-xSrxCuO4 probed by microwave complex conductivity measurement technique

Atsutaka Maeda; Ryo Tanaka; Takeyoshi Ohashi; Yoshinori Imai; Haruhisa Kitano; Ichiro Tsukada

doi:10.1016/j.physc.2009.10.097

Crossover from vortex-to-fluctuation picture in the vast vortex-liquid state of cuprate superconductors La_2-xSr_xCuO₄ probed by microwave complex conductivity measurement technique

Atsutaka Maeda, Ryo Tanaka, Takeyoshi Ohashi, Yoshinori Imai, Haruhisa Kitano, Ichiro Tsukada

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We investigate microwave complex conductivity of La_2-xSr _xCuO₄ under finite magnetic fields by broadband technique, and analyze the result from the two alternative viewpoints; (1) superconductivity fluctuation, and (2) vortex motion. For higher fields, conventional scaling relation between conductivity and frequency does not hold. We propose a new "scaling" relation for these data. On the other hand, vortex picture works even in the vortex liquid state. However, a strange behavior of superfluid density indicates that the vortex picture alone cannot explain the whole behavior even just above the first order transition line.

Original language	English
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.10.097
Publication status	Published - 2010 Dec 1
Externally published	Yes

Keywords

Broadband
Fluctuation
Microwave conductivity
Vortex

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2009.10.097

Cite this

Crossover from vortex-to-fluctuation picture in the vast vortex-liquid state of cuprate superconductors La_2-xSr_xCuO₄ probed by microwave complex conductivity measurement technique. / Maeda, Atsutaka; Tanaka, Ryo; Ohashi, Takeyoshi et al.

In: Physica C: Superconductivity and its applications, Vol. 470, No. SUPPL.1, 01.12.2010.

Research output: Contribution to journal › Article › peer-review

Maeda, A, Tanaka, R, Ohashi, T, Imai, Y, Kitano, H & Tsukada, I 2010, 'Crossover from vortex-to-fluctuation picture in the vast vortex-liquid state of cuprate superconductors La_2-xSr_xCuO₄ probed by microwave complex conductivity measurement technique', Physica C: Superconductivity and its applications, vol. 470, no. SUPPL.1. https://doi.org/10.1016/j.physc.2009.10.097

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