Small electronic specific heat in the electron doped Cu-oxide superconductors

M. Sera; S. Shamoto; M. Sato

doi:10.1016/0038-1098(89)90901-0

Small electronic specific heat in the electron doped Cu-oxide superconductors

M. Sera, S. Shamoto, M. Sato

Department of Physics

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

12 Citations (Scopus)

Abstract

The specific heat of the electron doped high-T_c Cu-oxides, Nd_1.85Ce_0.15CuO₄ and Pr_2-xCe_xCuO₄ (0≤×≤0.25) has been studied, where the attention was focussed on the behaviors around the superconducting transition temperature T_c in the former and at low temperatures in the latter. The specific heat of Nd_1.85Ce_0.15CuO₄ shows a very small jump at T_c from which the electronic specific heat coefficient γ was estimated to be ∼ 1.2mJ/mol K² by assuming ΔC/T_c=1.43γ. The γ value of Pr_2-xCe_xCuO₄ was estimated from the low temperature specific heat data obtained in the normal state near the metallic region as ∼ 2mJ/mol K² for x{reversed tilde equals}0.15, which is rather small compared to those of the hole doped Cu-oxide superconductors La_2-xM_xCuO₄ (M=Ba or Sr). This indicates that the effective mass m^* of the carriers in the electron doped system is smaller than those in the hole doped systems.

Original language	English
Pages (from-to)	749-752
Number of pages	4
Journal	Solid State Communications
Volume	72
Issue number	8
DOIs	https://doi.org/10.1016/0038-1098(89)90901-0
Publication status	Published - 1989 Nov

All Science Journal Classification (ASJC) codes

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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10.1016/0038-1098(89)90901-0

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title = "Small electronic specific heat in the electron doped Cu-oxide superconductors",

abstract = "The specific heat of the electron doped high-Tc Cu-oxides, Nd1.85Ce0.15CuO4 and Pr2-xCexCuO4 (0≤×≤0.25) has been studied, where the attention was focussed on the behaviors around the superconducting transition temperature Tc in the former and at low temperatures in the latter. The specific heat of Nd1.85Ce0.15CuO4 shows a very small jump at Tc from which the electronic specific heat coefficient γ was estimated to be ∼ 1.2mJ/mol K2 by assuming ΔC/Tc=1.43γ. The γ value of Pr2-xCexCuO4 was estimated from the low temperature specific heat data obtained in the normal state near the metallic region as ∼ 2mJ/mol K2 for x{reversed tilde equals}0.15, which is rather small compared to those of the hole doped Cu-oxide superconductors La2-xMxCuO4 (M=Ba or Sr). This indicates that the effective mass m* of the carriers in the electron doped system is smaller than those in the hole doped systems.",

author = "M. Sera and S. Shamoto and M. Sato",

note = "Funding Information: Acknowledgements --This work is supported by Grand-in-Aid for Scientific Research of Priority Areas of the Ministry of Education, Science and Culture.",

year = "1989",

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doi = "10.1016/0038-1098(89)90901-0",

language = "English",

volume = "72",

pages = "749--752",

journal = "Solid State Communications",

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T1 - Small electronic specific heat in the electron doped Cu-oxide superconductors

AU - Sera, M.

AU - Shamoto, S.

AU - Sato, M.

N1 - Funding Information: Acknowledgements --This work is supported by Grand-in-Aid for Scientific Research of Priority Areas of the Ministry of Education, Science and Culture.

PY - 1989/11

Y1 - 1989/11

N2 - The specific heat of the electron doped high-Tc Cu-oxides, Nd1.85Ce0.15CuO4 and Pr2-xCexCuO4 (0≤×≤0.25) has been studied, where the attention was focussed on the behaviors around the superconducting transition temperature Tc in the former and at low temperatures in the latter. The specific heat of Nd1.85Ce0.15CuO4 shows a very small jump at Tc from which the electronic specific heat coefficient γ was estimated to be ∼ 1.2mJ/mol K2 by assuming ΔC/Tc=1.43γ. The γ value of Pr2-xCexCuO4 was estimated from the low temperature specific heat data obtained in the normal state near the metallic region as ∼ 2mJ/mol K2 for x{reversed tilde equals}0.15, which is rather small compared to those of the hole doped Cu-oxide superconductors La2-xMxCuO4 (M=Ba or Sr). This indicates that the effective mass m* of the carriers in the electron doped system is smaller than those in the hole doped systems.

AB - The specific heat of the electron doped high-Tc Cu-oxides, Nd1.85Ce0.15CuO4 and Pr2-xCexCuO4 (0≤×≤0.25) has been studied, where the attention was focussed on the behaviors around the superconducting transition temperature Tc in the former and at low temperatures in the latter. The specific heat of Nd1.85Ce0.15CuO4 shows a very small jump at Tc from which the electronic specific heat coefficient γ was estimated to be ∼ 1.2mJ/mol K2 by assuming ΔC/Tc=1.43γ. The γ value of Pr2-xCexCuO4 was estimated from the low temperature specific heat data obtained in the normal state near the metallic region as ∼ 2mJ/mol K2 for x{reversed tilde equals}0.15, which is rather small compared to those of the hole doped Cu-oxide superconductors La2-xMxCuO4 (M=Ba or Sr). This indicates that the effective mass m* of the carriers in the electron doped system is smaller than those in the hole doped systems.

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JO - Solid State Communications

JF - Solid State Communications

SN - 0038-1098

IS - 8

ER -

Small electronic specific heat in the electron doped Cu-oxide superconductors

Abstract

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