Superconducting condensate density of (La1-xCax)(Ba1.75-xLa0.25+xCu3 O7+δ polycrystals

H. Yasuoka; A. Yamaguchi; Y. Tanaka; T. Katsumata; S. Tochihara; Y. Sato; V. Petrykin; M. Osada; M. Kakihana

doi:10.1016/S0921-4534(02)01433-8

Superconducting condensate density of (La_1-xCa_x)(Ba_1.75-xLa_0.25+xCu₃O_7+δ polycrystals

H. Yasuoka^*, A. Yamaguchi, Y. Tanaka, T. Katsumata, S. Tochihara, Y. Sato, V. Petrykin, M. Osada, M. Kakihana

^*Corresponding author for this work

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

Abstract

The superconducting condensate density n_s of single-phase tetragonal (La_1-xCa_x)(Ba_1.75-xLa_0.25+x)Cu₃O_7+δ polycrystals was examined by the magnetic measurements. The samples were synthesized with the composition range 0.1≤x≤1.0 by the amorphous metal-complex method. The magnetization curves were measured by a SQUID magnetometer. The lower critical field H_c1 was obtained from the magnetization curve using the modified Kim-Anderson critical-state model, in which H_c1 was taken into consideration. We estimated n_s at 0 K from the temperature dependence of H_c1. The n_s value increases until x = 0.5 and decreases over x = 0.5 as x increases. Besides, n_s was found to be linear to the hole density. The present relation between the transition temperature T_c and n_s is compared with the results for the underdoped samples by means of muon spin relaxation.

Original language	English
Pages (from-to)	311-315
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	378-381
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)01433-8
Publication status	Published - 2002 Oct 1
Externally published	Yes

Keywords

Ca substitution
La based cuprates
Lower critical field
Superconducting condensate density

ASJC Scopus subject areas

Condensed Matter Physics

Access to Document

10.1016/S0921-4534(02)01433-8

Cite this

@article{6635f84418fd4648871fb052574b2466,

title = "Superconducting condensate density of (La1-xCax)(Ba1.75-xLa0.25+xCu3 O7+δ polycrystals",

abstract = "The superconducting condensate density ns of single-phase tetragonal (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+δ polycrystals was examined by the magnetic measurements. The samples were synthesized with the composition range 0.1≤x≤1.0 by the amorphous metal-complex method. The magnetization curves were measured by a SQUID magnetometer. The lower critical field Hc1 was obtained from the magnetization curve using the modified Kim-Anderson critical-state model, in which Hc1 was taken into consideration. We estimated ns at 0 K from the temperature dependence of Hc1. The ns value increases until x = 0.5 and decreases over x = 0.5 as x increases. Besides, ns was found to be linear to the hole density. The present relation between the transition temperature Tc and ns is compared with the results for the underdoped samples by means of muon spin relaxation.",

keywords = "Ca substitution, La based cuprates, Lower critical field, Superconducting condensate density",

author = "H. Yasuoka and A. Yamaguchi and Y. Tanaka and T. Katsumata and S. Tochihara and Y. Sato and V. Petrykin and M. Osada and M. Kakihana",

year = "2002",

month = oct,

day = "1",

doi = "10.1016/S0921-4534(02)01433-8",

language = "English",

volume = "378-381",

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journal = "Physica C: Superconductivity and its Applications",

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T1 - Superconducting condensate density of (La1-xCax)(Ba1.75-xLa0.25+xCu3 O7+δ polycrystals

AU - Yasuoka, H.

AU - Yamaguchi, A.

AU - Tanaka, Y.

AU - Katsumata, T.

AU - Tochihara, S.

AU - Sato, Y.

AU - Petrykin, V.

AU - Osada, M.

AU - Kakihana, M.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - The superconducting condensate density ns of single-phase tetragonal (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+δ polycrystals was examined by the magnetic measurements. The samples were synthesized with the composition range 0.1≤x≤1.0 by the amorphous metal-complex method. The magnetization curves were measured by a SQUID magnetometer. The lower critical field Hc1 was obtained from the magnetization curve using the modified Kim-Anderson critical-state model, in which Hc1 was taken into consideration. We estimated ns at 0 K from the temperature dependence of Hc1. The ns value increases until x = 0.5 and decreases over x = 0.5 as x increases. Besides, ns was found to be linear to the hole density. The present relation between the transition temperature Tc and ns is compared with the results for the underdoped samples by means of muon spin relaxation.

AB - The superconducting condensate density ns of single-phase tetragonal (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+δ polycrystals was examined by the magnetic measurements. The samples were synthesized with the composition range 0.1≤x≤1.0 by the amorphous metal-complex method. The magnetization curves were measured by a SQUID magnetometer. The lower critical field Hc1 was obtained from the magnetization curve using the modified Kim-Anderson critical-state model, in which Hc1 was taken into consideration. We estimated ns at 0 K from the temperature dependence of Hc1. The ns value increases until x = 0.5 and decreases over x = 0.5 as x increases. Besides, ns was found to be linear to the hole density. The present relation between the transition temperature Tc and ns is compared with the results for the underdoped samples by means of muon spin relaxation.

KW - Ca substitution

KW - La based cuprates

KW - Lower critical field

KW - Superconducting condensate density

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