TY - JOUR
T1 - Low-temperature behavior of specific heat curves in ruthenocuprate RuSr2Gd1.5Ge0.5Cu2O 10 - δ
T2 - Superconducting, magnetic and crossing-point effects
AU - Belevtsev, B. I.
AU - Krasovitsky, V. B.
AU - Naugle, D. G.
AU - Rathnayaka, K. D.D.
AU - Agnolet, Glenn
AU - Felner, I.
PY - 2010/8
Y1 - 2010/8
N2 - Magnetic and superconducting properties of polycrystalline samples of RuSr2Gd1.5Ce0.5Cu2O (10 - δ), asprepared (by solid-state reaction) and annealed in pure oxygen at different pressure are presented. Specific heat and magnetization were investigated in the temperature range 1.8-300 K with a magnetic field up to 8 T. Specific heat, C (T), shows a jump at the superconducting transition (with onset at T ≈ 37.5 K) and a Schottky-type anomaly below 20 K. It is found that curves C(T) taken for different values of magnetic field have the same crossing point (at T * ≈ 2.7 K) for all samples studied. At the same time, C(H) curves taken for different temperatures have a crossing point at a characteristic field H * ≈ 3.7 T. These effects are manifestations of the crossing-point phenomenon, which is supposed to be inherent for strongly correlated electron systems.
AB - Magnetic and superconducting properties of polycrystalline samples of RuSr2Gd1.5Ce0.5Cu2O (10 - δ), asprepared (by solid-state reaction) and annealed in pure oxygen at different pressure are presented. Specific heat and magnetization were investigated in the temperature range 1.8-300 K with a magnetic field up to 8 T. Specific heat, C (T), shows a jump at the superconducting transition (with onset at T ≈ 37.5 K) and a Schottky-type anomaly below 20 K. It is found that curves C(T) taken for different values of magnetic field have the same crossing point (at T * ≈ 2.7 K) for all samples studied. At the same time, C(H) curves taken for different temperatures have a crossing point at a characteristic field H * ≈ 3.7 T. These effects are manifestations of the crossing-point phenomenon, which is supposed to be inherent for strongly correlated electron systems.
UR - http://www.scopus.com/inward/record.url?scp=77958096586&partnerID=8YFLogxK
U2 - 10.3103/S1062873810080034
DO - 10.3103/S1062873810080034
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AN - SCOPUS:77958096586
SN - 1062-8738
VL - 74
SP - 1049
EP - 1052
JO - Bulletin of the Russian Academy of Sciences: Physics
JF - Bulletin of the Russian Academy of Sciences: Physics
IS - 8
ER -