Anomalous magnetic field dependence of Y Ba(2)Cu(3)O(7 - δ): effect of orthorhombic distortion.

Journal of physics. Condensed matter : an Institute of Physics journal · 2010 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3296

Study snapshot

PublicationJournal of physics. Condensed matter : an Institute of Physics journal · 2010

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

In this work an attempt has been made to ascertain the origin of the mixed symmetry state of the order parameters in the high-T(c) superconductor Y Ba(2)Cu(3)O(7 - δ), with the contesting candidates being the orthorhombic distortion associated with the CuO(2) planes and an s-wave order parameter component originating from the CuO chains present in the system. Due to its applicability over the entire range of applied magnetic field H(c1) < H < H(c2) the present theoretical model has been employed to study various unusual properties which are signatures of the unconventional pairing state symmetry of this material. The results presented in this paper and their agreement with the relevant experimental data suggest that the origin of the mixed symmetry state of pairing and the various experimentally observed unusual properties of Y Ba(2)Cu(3)O(7 - δ) including the anomalous magnetic field dependence of the vortex lattice structure, unusual upward curvature of the H(c2)(T) plot, etc, can be attributed to the orthorhombic distortion of the CuO(2) planes present in this material. However, the effect discussed in the present work pertains to the orthorhombic distortion arising only through a second-order coupling; the distortion arising from other possible sources, namely anisotropic mixed gradient coupling, has not been taken into account here. Hence this discussion is restricted to a qualitative explanation of the effect due to orthorhombic distortion arising from the second-order coupling only.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

A theoretical model is used to explain unusual properties of YBa2Cu3O7-δ across the applied magnetic field range Hc1 < H < Hc2. The results, stated to agree with relevant experimental data, suggest that the mixed symmetry pairing state and anomalous magnetic-field-dependent properties (e.g., vortex lattice structure changes and upward curvature of Hc2(T)) can be attributed to orthorhombic distortion of the CuO2 planes via a second-order coupling mechanism.

Outcomes measured

Mixed symmetry state of superconducting order parameters in YBa2Cu3O7-δ
Magnetic-field dependence of vortex lattice structure
Temperature dependence/curvature of upper critical field Hc2(T)

Limitations

The discussion is restricted to qualitative explanation of orthorhombic distortion effects arising through second-order coupling only.
Other possible sources of distortion (e.g., anisotropic mixed gradient coupling) are not taken into account.
The work is theoretical; no direct exposure assessment or biological/health outcomes are described in the abstract.

View raw extracted JSON

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  "study_type": "other",
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  },
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  "outcomes": [
    "Mixed symmetry state of superconducting order parameters in YBa2Cu3O7-δ",
    "Magnetic-field dependence of vortex lattice structure",
    "Temperature dependence/curvature of upper critical field Hc2(T)"
  ],
  "main_findings": "A theoretical model is used to explain unusual properties of YBa2Cu3O7-δ across the applied magnetic field range Hc1 < H < Hc2. The results, stated to agree with relevant experimental data, suggest that the mixed symmetry pairing state and anomalous magnetic-field-dependent properties (e.g., vortex lattice structure changes and upward curvature of Hc2(T)) can be attributed to orthorhombic distortion of the CuO2 planes via a second-order coupling mechanism.",
  "effect_direction": "unclear",
  "limitations": [
    "The discussion is restricted to qualitative explanation of orthorhombic distortion effects arising through second-order coupling only.",
    "Other possible sources of distortion (e.g., anisotropic mixed gradient coupling) are not taken into account.",
    "The work is theoretical; no direct exposure assessment or biological/health outcomes are described in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "YBa2Cu3O7-δ",
    "high-Tc superconductor",
    "orthorhombic distortion",
    "mixed symmetry order parameter",
    "vortex lattice",
    "upper critical field",
    "Hc2(T)",
    "theoretical model"
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1088/0953-8984/22/25/255701
PubMed: 21393806

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