Thermodynamics and critical fields of YBa{sub 2}(Cu{sub 1{minus}{ital x}}Ni{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} from a {ital d}-wave model of superconductivity

Ulm, E R; Lemberger, T R

doi:10.1103/PhysRevB.53.11352

Title: Thermodynamics and critical fields of YBa{sub 2}(Cu{sub 1{minus}{ital x}}Ni{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} from a {ital d}-wave model of superconductivity

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Abstract

Specific heat, penetration depth, and infrared measurements on Ni- and Zn-doped YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} are shown to be consistent with each other within the framework of a phenomenological model in which a {ital d}-wave density of states is broadened by the disorder associated with the dopant. Strong scattering from each dopant atom results in a rapid filling in of the low-energy density of states. We use the model, with scattering rates taken from the infrared reflectance and a normal-state density of states taken from the specific heat, to calculate the thermodynamic critical field {ital H}{sub {ital c}}({ital T}), the specific heat {ital C}({ital T}), the {ital ab}-plane penetration depth {lambda}({ital T}), the {ital ab}-plane coherence length {xi}({ital T}), and the critical fields {ital H}{sub {ital c}1}({ital T}) and {ital H}{sub {ital c}2}({ital T}) for fields applied perpendicular to the {ital ab} plane. {ital C}({ital T}) and {lambda}({ital T}) are compared, favorably, with measurements. {xi} and {ital H}{sub {ital c}2} have not been measured directly, so this paper presents the first experimental estimate of these quantities. It is found that {xi}(0) increases by less than 50{percent} with increasing Ni concentration, even though the superfluid density,more »« less

Authors:

Ulm, E R; Lemberger, T R ^[1]

Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)

Publication Date:: Wed May 01 00:00:00 EDT 1996

Research Org.:: Purdue Univ., West Lafayette, IN (United States)

OSTI Identifier:: 286130

DOE Contract Number:: FG02-90ER45427

Resource Type:: Journal Article

Journal Name:: Physical Review, B: Condensed Matter

Additional Journal Information:: Journal Volume: 53; Journal Issue: 17; Other Information: PBD: May 1996

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 66 PHYSICS; HIGH-TC SUPERCONDUCTORS; THERMODYNAMIC PROPERTIES; CRITICAL FIELD; YTTRIUM OXIDES; BARIUM OXIDES; COPPER OXIDES; D WAVES; SPECIFIC HEAT; PENETRATION DEPTH; INFRARED SPECTRA; DOPED MATERIALS; NICKEL ADDITIONS; ZINC ADDITIONS; COHERENCE LENGTH

Citation Formats


                    Ulm, E R, and Lemberger, T R. Thermodynamics and critical fields of YBa{sub 2}(Cu{sub 1{minus}{ital x}}Ni{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} from a {ital d}-wave model of superconductivity.  United States: N. p., 1996. 
        Web.  doi:10.1103/PhysRevB.53.11352.

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                    Ulm, E R, & Lemberger, T R. Thermodynamics and critical fields of YBa{sub 2}(Cu{sub 1{minus}{ital x}}Ni{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} from a {ital d}-wave model of superconductivity.  United States.  https://doi.org/10.1103/PhysRevB.53.11352

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                    Ulm, E R, and Lemberger, T R. 1996.  
        "Thermodynamics and critical fields of YBa{sub 2}(Cu{sub 1{minus}{ital x}}Ni{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} from a {ital d}-wave model of superconductivity".  United States.  https://doi.org/10.1103/PhysRevB.53.11352.

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@article{osti_286130,

  title        = {Thermodynamics and critical fields of YBa{sub 2}(Cu{sub 1{minus}{ital x}}Ni{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} from a {ital d}-wave model of superconductivity},

  author       = {Ulm, E R and Lemberger, T R},

  abstractNote = {Specific heat, penetration depth, and infrared measurements on Ni- and Zn-doped YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7{minus}{delta}} are shown to be consistent with each other within the framework of a phenomenological model in which a {ital d}-wave density of states is broadened by the disorder associated with the dopant. Strong scattering from each dopant atom results in a rapid filling in of the low-energy density of states. We use the model, with scattering rates taken from the infrared reflectance and a normal-state density of states taken from the specific heat, to calculate the thermodynamic critical field {ital H}{sub {ital c}}({ital T}), the specific heat {ital C}({ital T}), the {ital ab}-plane penetration depth {lambda}({ital T}), the {ital ab}-plane coherence length {xi}({ital T}), and the critical fields {ital H}{sub {ital c}1}({ital T}) and {ital H}{sub {ital c}2}({ital T}) for fields applied perpendicular to the {ital ab} plane. {ital C}({ital T}) and {lambda}({ital T}) are compared, favorably, with measurements. {xi} and {ital H}{sub {ital c}2} have not been measured directly, so this paper presents the first experimental estimate of these quantities. It is found that {xi}(0) increases by less than 50{percent} with increasing Ni concentration, even though the superfluid density, proportional to 1/{lambda}{sup 2}(0), decreases by a factor of 10. {copyright} {ital 1996 The American Physical Society.}},

  doi          = {10.1103/PhysRevB.53.11352},

  url          = {https://www.osti.gov/biblio/286130},
  journal      = {Physical Review, B: Condensed Matter},
number       = 17,

  volume       = 53,

  place        = {United States},

  year         = {Wed May 01 00:00:00 EDT 1996},

  month        = {Wed May 01 00:00:00 EDT 1996}

}

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