Measurements of the Magnetic Field Dependence of Lambda in YBa_2Cu_3O_6.95: Results as a Function of Temperature and Field Orientation

Abstract

We present measurements of the magnetic field dependence of the penetration depth Lambda(H) for untwinned YBa_2Cu_3O_6.95 for temperatures from 1.2 to 70 K in dc fields up to 42 gauss and directions 0, 45 and 90 degrees with respect to the crystal b-axis. The experiment uses an ac susceptometer with fields applied parallel to the ab-plane of thin platelet samples. The resolution is about 0.15 Angstroms in zero dc field, degrading to 0.2 or 0.3 Angstroms at the higher fields. At low temperatures the field dependencies are essentially linear in H, ranging from 0.04 Angstroms/gauss for Delta-Lambda_a to 0.10 Angstroms/gauss for Delta-Lambda_b, values comparable to the T=0 Yip and Sauls prediction for a d-wave superconductor. However, the systematics versus temperature and orientation do not agree with the d-wave scenario probably due, in part, to residual sample problems.

5 pages, 4 figures

References in corpus (4)

• Absence of non-linear Meissner effect in YBa2Cu3O6.95
• Angular Dependence of the Nonlinear Transverse Magnetic Moment of YBCO in the Meissner state
• Is the nonlinear Meissner effect unobservable?
• Low Frequency Nonlinear Magnetic Response of an Unconventional Superconductor

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• Thermodynamics of d-wave superconductors in a magnetic field
• Kinetic-energy driven superconductivity in cuprate superconductors
• Measurement of the nonlinear Meissner effect in superconducting Nb films using a resonant microwave cavity: A probe of unconventional pairing symmetries
• Doping-Dependent Nonlinear Meissner Effect and Spontaneous Currents in High-Tc Superconductors
• Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples
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• London penetration depth measurements using tunnel diode resonators
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• Study on Unconventional Superconductors via Angle-resolved Specific Heat
• Microwave spectroscopy of vortex dynamics in ortho-II YBa2Cu3O6.52
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• Imaging the paramagnetic nonlinear Meissner effect in nodal gap superconductor
• Observation of the Non-linear Meissner Effect
• Destruction of chain-superconductivity in YBa_2Cu_4O_8 in a weak magnetic field
• Theory of Nonlinear Meissner Effect in High-Tc Superconductors
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• Modes of an elliptical cylindrical resonant cavity -- analytical solution
• Nonlinear electrodynamics of p-wave superconductors
• Angular dependence of the penetration depth in unconventional superconductors
• The Superconducting Transition and Mixed State of YBa${}_2$Cu${}_3$O${}_{6.95}$: An Undergraduate Experiment