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Phase transition in the cuprates from a magnetic-field-free stiffness meter viewpoint.

ABSTRACT: A method to measure the superconducting (SC) stiffness tensor [Formula: see text], without subjecting the sample to external magnetic field, is applied to La1.875Sr0.125CuO4. The method is based on the London equation [Formula: see text], where J is the current density and A is the vector potential which is applied in the SC state. Using rotor free A and measuring J via the magnetic moment of superconducting rings, [Formula: see text] at T???Tc is extracted. The technique is sensitive to very small stiffnesses (penetration depths on the order of a few millimeters). The method is applied to two different rings: one with the current running only in the CuO2 planes, and another where the current must cross planes. We find different transition temperatures for the two rings, namely, there is a temperature range with two-dimensional stiffness. Additional low energy muon spin rotation measurements on the same sample determine the stiffness anisotropy at T?

SUBMITTER: Kapon I

PROVIDER: S-EPMC6549142 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Phase transition in the cuprates from a magnetic-field-free stiffness meter viewpoint.

Kapon Itzik I Salman Zaher Z Mangel Itay I Prokscha Thomas T Gavish Nir N Keren Amit A

Nature communications 20190605 1

A method to measure the superconducting (SC) stiffness tensor [Formula: see text], without subjecting the sample to external magnetic field, is applied to La1.875Sr0.125CuO4. The method is based on the London equation [Formula: see text], where J is the current density and A is the vector potential which is applied in the SC state. Using rotor free A and measuring J via the magnetic moment of superconducting rings, [Formula: see text] at T → Tc is extr ...[more]

PMID: 31165737

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