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Scaling of thin-film Nd₁.₈₅Ce₀.₁₅CuO[subscript 4-y] resistivity-current isotherms at low fields: Implications for vortex phase transitions and universality

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  • We have investigated a second-order phase transition of the vortex lattice in thin-film Nd₁.₈₅Ce₀.₁₅CuO[subscript 4-y] from 1 mT to 1 T applied magnetic fields. The dc resistivity-current density data for each field exhibit critical scaling consistent with a second-order vortex-liquid to vortex-solid phase transition. The high-field data support the vortex-glass model and have the same critical exponents as thin-film YBa₂Cu₃O[subscript 7-δ]. At low fields we observe a change in the critical exponents and universal functions. The critical regime diminishes as the field is decreased but remains nonzero even at 1 mT. These results suggest that the universality class of the transition changes at low fields.
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  • Roberts, J. M., Brown, B., Tate, J., Xi, X. X., & Mao, S. N. (1995). Scaling of thin-film Nd1.85Ce0.15CuO4-y resistivity-current isotherms at low fields: Implications for vortex phase transitions and universality. Physical Review B, 51(21):15281-15285. doi:10.1103/PhysRevB.51.15281
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  • 51
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  • 21
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  • This work is partially supported by the NSF under DMR 9408628.
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