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

Itzik Kapon (), Zaher Salman, Itay Mangel, Thomas Prokscha, Nir Gavish and Amit Keren ()
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Itzik Kapon: Technion—Israel Institute of Technology
Zaher Salman: Paul Scherrer Institute
Itay Mangel: Technion—Israel Institute of Technology
Thomas Prokscha: Paul Scherrer Institute
Nir Gavish: Technion—Israel Institute of Technology
Amit Keren: Technion—Israel Institute of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract A method to measure the superconducting (SC) stiffness tensor $$\bar \rho _{\mathrm{s}}$$ ρ ¯ s , without subjecting the sample to external magnetic field, is applied to La1.875Sr0.125CuO4. The method is based on the London equation $${\mathbf{J}} = - {\bar{\mathbf{\rho }}}_{\mathrm{s}}{\mathbf{A}}$$ J = - ρ ¯ s A , 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, $$\bar \rho _{\mathrm{s}}$$ ρ ¯ s 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

Date: 2019
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DOI: 10.1038/s41467-019-10480-x

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