Comparison between the magnetic specific heat of NdBa2Cu3O
x
and DyBa2Cu3O
x |
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| Authors: | P Allenspach B W Lee D A Gajewski V B Barbeta M B Maple G Nieva S -I Yoo M J Kramer R W McCallum L Ben-Dor |
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| Institution: | (1) Institute for Pure and Applied Physical Sciences and Department of Physics, University of California at San Diego, 92093-0075 La Jolla, CA, USA;(2) Centro Atomico Bariloche, 8400 San Carlos de Bariloche, Rio Negro, Argentina;(3) Ames Laboratory, Iowa State University, 50011-3020 Ames, IA, USA;(4) Department of Inorganic and Analytical Chemistry, Hebrew University, 91904 Jerusalem, Israel;(5) Present address: Laboratory for Neutron Scattering, ETH Zurich, CH-5232 Villigen PSI, Switzerland;(6) Present address: Department of Physics, Hankuk University of Foreign Studies, 449-791 Kyungk'Do, Korea;(7) Present address: Instituto de Fisica-Depto de Fisica de Materiais e Mechanica, Univ. de Sao Paulo, CP 20516-01498 Sao Paulo, Brazil;(8) Present address: Division VII, Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-16-26 Shibaura, Minato-ku, 105 Tokyo, Japan |
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| Abstract: | Low temperature heat-capacity measurements have been performed to study the magnetic ordering in NdBa2Cu3O
x
and DyBa2Cu3O
x
. In order to investigate the type of ordering, magnetic fields up to 6 T and hydrostatic pressures up to 4.5 kbar were applied. While for NdBa2Cu3O
x
and DyBa2Cu3O
x
both the fully oxidized and the fully oxygen reduced samples display long rang antiferromagnetic ordering, only magnetic short range interaction could be found for samples in an intermediate range of oxygen concentration. For NdBa2Cu3O
x
, where superexchange is believed to be the dominant magnetic interaction,T
N
is three times higher in the sample withx=6.26 compared to the one withx=6.98. In contrast,T
N
of DyBa2Cu3O
x
is almost oxygen independent as expected for this mainly dipolar interacting system. |
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| Keywords: | 74 70 Vy 75 40 -s |
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