EXPERIMENTAL STUDIES ON THE EFFECTS OF TRANSITION METAL DOPING IN OVERDOPED "2212" BISMUTH SUPERCONDUCTORS

S. Leelaprute; I. M. Tang; T. Osotchan

doi:10.2306/scienceasia1513-1874.1997.23.359

EXPERIMENTAL STUDIES ON THE EFFECTS OF TRANSITION METAL DOPING IN OVERDOPED "2212" BISMUTH SUPERCONDUCTORS

S. Leelaprute
, I. M. Tang
, T. Osotchan

Department of Physics

Mahidol University
Mahidol University

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

Abstract

The depression of the T_c's of over doped "2212" bismuth superconductors due to transition metal (TM) substitution is studied. Single phase Bi_1.55Pb_0.45Sr₂CaCu_2-xTM_xO_8+y (TM = Zn, Fe, Ni and Co) superconductors with varying hole concentrations were obtained by quenching in liquid nitrogen, superconducting pellets being annealed at different temperatures. It is seen that the T_c's decrease linearly with increasing substitution (once the influence of the varying hole concentration is taken into consideration) of the TM impurities. The rates of depression of T_c due to non magnetic Zn²⁺ substitution and to magnetic Ni²⁺ substitutions are nearly the same. The magnitudes of the rates of depression dT_c/dx caused by different magnetic TM ion substitutions appear to scale with the square of the magnetic moments formed on the ions. These behaviors are explained in the context of the spin fluctuation induced theory for high temperature superconductors.

Original language	English
Pages (from-to)	359-369
Number of pages	11
Journal	ScienceAsia
Volume	23
Issue number	4
DOIs	https://doi.org/10.2306/scienceasia1513-1874.1997.23.359
Publication status	Published - Dec 1997

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10.2306/scienceasia1513-1874.1997.23.359

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title = "EXPERIMENTAL STUDIES ON THE EFFECTS OF TRANSITION METAL DOPING IN OVERDOPED {"}2212{"} BISMUTH SUPERCONDUCTORS",

abstract = "The depression of the Tc's of over doped {"}2212{"} bismuth superconductors due to transition metal (TM) substitution is studied. Single phase Bi1.55Pb0.45Sr2CaCu2-xTMxO8+y (TM = Zn, Fe, Ni and Co) superconductors with varying hole concentrations were obtained by quenching in liquid nitrogen, superconducting pellets being annealed at different temperatures. It is seen that the Tc's decrease linearly with increasing substitution (once the influence of the varying hole concentration is taken into consideration) of the TM impurities. The rates of depression of Tc due to non magnetic Zn2+ substitution and to magnetic Ni2+ substitutions are nearly the same. The magnitudes of the rates of depression dTc/dx caused by different magnetic TM ion substitutions appear to scale with the square of the magnetic moments formed on the ions. These behaviors are explained in the context of the spin fluctuation induced theory for high temperature superconductors.",

author = "S. Leelaprute and Tang, \{I. M.\} and T. Osotchan",

year = "1997",

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doi = "10.2306/scienceasia1513-1874.1997.23.359",

language = "English",

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AU - Leelaprute, S.

AU - Tang, I. M.

AU - Osotchan, T.

PY - 1997/12

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N2 - The depression of the Tc's of over doped "2212" bismuth superconductors due to transition metal (TM) substitution is studied. Single phase Bi1.55Pb0.45Sr2CaCu2-xTMxO8+y (TM = Zn, Fe, Ni and Co) superconductors with varying hole concentrations were obtained by quenching in liquid nitrogen, superconducting pellets being annealed at different temperatures. It is seen that the Tc's decrease linearly with increasing substitution (once the influence of the varying hole concentration is taken into consideration) of the TM impurities. The rates of depression of Tc due to non magnetic Zn2+ substitution and to magnetic Ni2+ substitutions are nearly the same. The magnitudes of the rates of depression dTc/dx caused by different magnetic TM ion substitutions appear to scale with the square of the magnetic moments formed on the ions. These behaviors are explained in the context of the spin fluctuation induced theory for high temperature superconductors.

AB - The depression of the Tc's of over doped "2212" bismuth superconductors due to transition metal (TM) substitution is studied. Single phase Bi1.55Pb0.45Sr2CaCu2-xTMxO8+y (TM = Zn, Fe, Ni and Co) superconductors with varying hole concentrations were obtained by quenching in liquid nitrogen, superconducting pellets being annealed at different temperatures. It is seen that the Tc's decrease linearly with increasing substitution (once the influence of the varying hole concentration is taken into consideration) of the TM impurities. The rates of depression of Tc due to non magnetic Zn2+ substitution and to magnetic Ni2+ substitutions are nearly the same. The magnitudes of the rates of depression dTc/dx caused by different magnetic TM ion substitutions appear to scale with the square of the magnetic moments formed on the ions. These behaviors are explained in the context of the spin fluctuation induced theory for high temperature superconductors.

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EXPERIMENTAL STUDIES ON THE EFFECTS OF TRANSITION METAL DOPING IN OVERDOPED "2212" BISMUTH SUPERCONDUCTORS

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