TY - JOUR
T1 - Relaxation in bulk RBa2Cu3O7-δ superconductors
AU - Jirsa, M.
AU - Nishizaki, T.
AU - Kobayashi, N.
AU - Muralidhar, M.
AU - Murakami, M.
N1 - Funding Information:
This work was accomplished under the support of grant GAAS of CR, No. K 1010104. M.J. acknowledges the financial support of JSPS in 2001 and 2002 that enabled him to stay at the Institute for Material Research, Tohoku University, Sendai, where most of the present experiments were made. Most of the samples were prepared in SRL∕ISTEC, Morioka.
PY - 2004/7
Y1 - 2004/7
N2 - The shape of the magnetic hysteresis curve, "MHL," in bulk strongly doped RBa2Cu3O7-δ materials is analyzed and its correlation with relaxation characteristics is verified. It is shown that field and temperature dependencies of logarithmic relaxation rate, Q=d ln J/d ln dB/dt, can be obtained from J(B) and J(T) data (J is the supercurrent density associated with total magnetic moment). In the case of the MHL with two well-distinguished peaks, the two additive contributions to J are correlated with corresponding relaxation characteristics, which are given analytically. Plateau in Q(T) dependence in such materials is shown to originate from scanning the specific shape of MHL at a fixed field. From Q(J) plot pinning energy characteristics at low and intermediate fields are deduced.
AB - The shape of the magnetic hysteresis curve, "MHL," in bulk strongly doped RBa2Cu3O7-δ materials is analyzed and its correlation with relaxation characteristics is verified. It is shown that field and temperature dependencies of logarithmic relaxation rate, Q=d ln J/d ln dB/dt, can be obtained from J(B) and J(T) data (J is the supercurrent density associated with total magnetic moment). In the case of the MHL with two well-distinguished peaks, the two additive contributions to J are correlated with corresponding relaxation characteristics, which are given analytically. Plateau in Q(T) dependence in such materials is shown to originate from scanning the specific shape of MHL at a fixed field. From Q(J) plot pinning energy characteristics at low and intermediate fields are deduced.
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U2 - 10.1103/PhysRevB.70.024525
DO - 10.1103/PhysRevB.70.024525
M3 - Article
AN - SCOPUS:42749105224
SN - 0163-1829
VL - 70
SP - 024525-1-024525-9
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 2
M1 - 024525
ER -