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J.S. acknowledges the CNRS “Institut de Physique” for supporting his visiting position at the Unité Mixte de Physique CNRS/Thales.We experimentally study the superconducting proximity effect in high-temperature superconductor/halfmetallic ferromagnet YBa_(2)Cu_(3)O_(7)/La_(2/3)Ca_(1/3)MnO_(3) junctions, using conductance measurements. In particular, we investigate the magnetic-field dependence of the spectroscopic signatures that evidence the long-range penetration of superconducting correlations into the half-metal. Those signatures are insensitive to the applied field when this is below the ferromagnet’s saturation fields, which demonstrates that they are uncorrelated with its macroscopic magnetization. However, the application of more intense fields progressively washes away the fingerprint of long-range proximity effects. This is consistent with the fact that the well-known magnetic inhomogeneities at the c-axis YYBa_(2)Cu_(3)O_(7)/La_(2/3)Ca_(1/3)MnO_(3) interface play a role in the proximity behavior.engjournal articlehttp://dx.doi.org/10.1103/PhysRevB.92.014519http://journals.aps.org/open access537Spin Andreev reflectionTriplet supercurrentsFerromagnetJunctions.ElectricidadElectrónica (Física)2202.03 Electricidad