Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order
We have measured the specific heat and magnetization versus temperature in a single crystal sample of superconducting La2CuO4.11 and in a sample of the same material after removing the excess oxygen, in magnetic fields up to 15 T. Using the deoxygenated sample to subtract the phonon contribution, we...
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v69_n17_p174506_Jorge http://hdl.handle.net/20.500.12110/paper_01631829_v69_n17_p174506_Jorge |
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paper:paper_01631829_v69_n17_p174506_Jorge2023-06-08T15:14:00Z Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order Jorge, Guillermo Antonio Civale, Leonardo copper complex lanthanum oxygen article crystal deoxygenation heat magnetic field magnetism mathematical model phase transition superconductor temperature dependence thermodynamics We have measured the specific heat and magnetization versus temperature in a single crystal sample of superconducting La2CuO4.11 and in a sample of the same material after removing the excess oxygen, in magnetic fields up to 15 T. Using the deoxygenated sample to subtract the phonon contribution, we find a broad peak in the specific heat, centered at 50 K. This excess specific heat is attributed to fluctuations of the Cu spins possibly enhanced by an interplay with the charge degrees of freedom, and appears to be independent of magnetic field, up to 15 T. Near the superconducting transition Tc(H = O) = 43 K, we find a sharp feature that is strongly suppressed when the magnetic field is applied parallel to the crystallographic c axis. A model for three-dimensional vortex fluctuations is used to scale magnetization measured at several magnetic fields. When the magnetic field is applied perpendicular to the c axis, the only observed effect is a slight shift in the superconducting transition temperature. Fil:Jorge, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Civale, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v69_n17_p174506_Jorge http://hdl.handle.net/20.500.12110/paper_01631829_v69_n17_p174506_Jorge |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
copper complex lanthanum oxygen article crystal deoxygenation heat magnetic field magnetism mathematical model phase transition superconductor temperature dependence thermodynamics |
spellingShingle |
copper complex lanthanum oxygen article crystal deoxygenation heat magnetic field magnetism mathematical model phase transition superconductor temperature dependence thermodynamics Jorge, Guillermo Antonio Civale, Leonardo Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order |
topic_facet |
copper complex lanthanum oxygen article crystal deoxygenation heat magnetic field magnetism mathematical model phase transition superconductor temperature dependence thermodynamics |
description |
We have measured the specific heat and magnetization versus temperature in a single crystal sample of superconducting La2CuO4.11 and in a sample of the same material after removing the excess oxygen, in magnetic fields up to 15 T. Using the deoxygenated sample to subtract the phonon contribution, we find a broad peak in the specific heat, centered at 50 K. This excess specific heat is attributed to fluctuations of the Cu spins possibly enhanced by an interplay with the charge degrees of freedom, and appears to be independent of magnetic field, up to 15 T. Near the superconducting transition Tc(H = O) = 43 K, we find a sharp feature that is strongly suppressed when the magnetic field is applied parallel to the crystallographic c axis. A model for three-dimensional vortex fluctuations is used to scale magnetization measured at several magnetic fields. When the magnetic field is applied perpendicular to the c axis, the only observed effect is a slight shift in the superconducting transition temperature. |
author |
Jorge, Guillermo Antonio Civale, Leonardo |
author_facet |
Jorge, Guillermo Antonio Civale, Leonardo |
author_sort |
Jorge, Guillermo Antonio |
title |
Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order |
title_short |
Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order |
title_full |
Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order |
title_fullStr |
Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order |
title_full_unstemmed |
Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order |
title_sort |
thermodynamic properties of excess-oxygen-doped la2cuo 4.11 near a simultaneous transition to superconductivity and long-range magnetic order |
publishDate |
2004 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v69_n17_p174506_Jorge http://hdl.handle.net/20.500.12110/paper_01631829_v69_n17_p174506_Jorge |
work_keys_str_mv |
AT jorgeguillermoantonio thermodynamicpropertiesofexcessoxygendopedla2cuo411nearasimultaneoustransitiontosuperconductivityandlongrangemagneticorder AT civaleleonardo thermodynamicpropertiesofexcessoxygendopedla2cuo411nearasimultaneoustransitiontosuperconductivityandlongrangemagneticorder |
_version_ |
1768545278375231488 |