Dependence of superconducting properties on the Cu-valence determined by iodometry in HgBa2CuO4+δ

A. Fukuoka; A. Tokiwa-Yamamoto; M. Itoh; R. Usami; S. Adachi; H. Yamauchi; K. Tanabe

doi:10.1016/0921-4534(96)00288-2

Dependence of superconducting properties on the Cu-valence determined by iodometry in HgBa₂CuO_4+δ

A. Fukuoka, A. Tokiwa-Yamamoto, M. Itoh, R. Usami, S. Adachi, H. Yamauchi, K. Tanabe

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

54 Citations (Scopus)

Abstract

We have synthesized nearly single-phase HgBa₂CuO_4+δ samples with various oxygen contents, and systematically investigated the relationship between the lattice parameters, the superconductivity transition temperature (T_c) and the oxygen content determined by iodometry. Furthermore, the nominal copper valence values were calculated from the oxygen content data by assuming constant valence values of +2.00 and -2.00 for mercury and oxygen, respectively. Both the a and c lattice parameters were found to decrease monotonically with the Cu valence over a wide range of +2.05-2.28. The obtained T_c versus Cu valence curve exhibits a "bell shaped" correlation with the maximum in T_c at the Cu valence of ∼ +2.18.

Original language	English
Pages (from-to)	13-18
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	265
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(96)00288-2
Publication status	Published - 1996 Jul 1
Externally published	Yes

ASJC Scopus subject areas

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

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title = "Dependence of superconducting properties on the Cu-valence determined by iodometry in HgBa2CuO4+δ",

abstract = "We have synthesized nearly single-phase HgBa2CuO4+δ samples with various oxygen contents, and systematically investigated the relationship between the lattice parameters, the superconductivity transition temperature (Tc) and the oxygen content determined by iodometry. Furthermore, the nominal copper valence values were calculated from the oxygen content data by assuming constant valence values of +2.00 and -2.00 for mercury and oxygen, respectively. Both the a and c lattice parameters were found to decrease monotonically with the Cu valence over a wide range of +2.05-2.28. The obtained Tc versus Cu valence curve exhibits a {"}bell shaped{"} correlation with the maximum in Tc at the Cu valence of ∼ +2.18.",

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T1 - Dependence of superconducting properties on the Cu-valence determined by iodometry in HgBa2CuO4+δ

AU - Fukuoka, A.

AU - Tokiwa-Yamamoto, A.

AU - Itoh, M.

AU - Usami, R.

AU - Adachi, S.

AU - Yamauchi, H.

AU - Tanabe, K.

PY - 1996/7/1

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AB - We have synthesized nearly single-phase HgBa2CuO4+δ samples with various oxygen contents, and systematically investigated the relationship between the lattice parameters, the superconductivity transition temperature (Tc) and the oxygen content determined by iodometry. Furthermore, the nominal copper valence values were calculated from the oxygen content data by assuming constant valence values of +2.00 and -2.00 for mercury and oxygen, respectively. Both the a and c lattice parameters were found to decrease monotonically with the Cu valence over a wide range of +2.05-2.28. The obtained Tc versus Cu valence curve exhibits a "bell shaped" correlation with the maximum in Tc at the Cu valence of ∼ +2.18.

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