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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Autores principales: Jorge, G.A., Jaime, M., Civale, L., Batista, C.D., Zink, B.L., Hellman, F., Khaykovich, B., Kastner, M.A., Lee, Y.S., Birgeneau, R.J.
Formato: JOUR
Materias:
copper complex
lanthanum
oxygen
article
crystal
deoxygenation
heat
magnetic field
magnetism
mathematical model
phase transition
superconductor
temperature dependence
thermodynamics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01631829_v69_n17_p174506_Jorge
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01631829_v69_n17_p174506_Jorge2023-10-03T15:01:57Z Thermodynamic properties of excess-oxygen-doped La2CuO 4.11 near a simultaneous transition to superconductivity and long-range magnetic order Jorge, G.A. Jaime, M. Civale, L. Batista, C.D. Zink, B.L. Hellman, F. Khaykovich, B. Kastner, M.A. Lee, Y.S. Birgeneau, R.J. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, G.A.
Jaime, M.
Civale, L.
Batista, C.D.
Zink, B.L.
Hellman, F.
Khaykovich, B.
Kastner, M.A.
Lee, Y.S.
Birgeneau, R.J.
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.
format JOUR
author Jorge, G.A.
Jaime, M.
Civale, L.
Batista, C.D.
Zink, B.L.
Hellman, F.
Khaykovich, B.
Kastner, M.A.
Lee, Y.S.
Birgeneau, R.J.
author_facet Jorge, G.A.
Jaime, M.
Civale, L.
Batista, C.D.
Zink, B.L.
Hellman, F.
Khaykovich, B.
Kastner, M.A.
Lee, Y.S.
Birgeneau, R.J.
author_sort Jorge, G.A.
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
url http://hdl.handle.net/20.500.12110/paper_01631829_v69_n17_p174506_Jorge
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