TY - JOUR
T1 - Vortex state of Pb-substituted Bi2201 studied by in-plain resistivity measurements
AU - Okamoto, D.
AU - Kudo, K.
AU - Okumura, N.
AU - Nishizaki, T.
AU - Kobayashi, N.
N1 - Funding Information:
The high magnetic field experiments were partly supported by the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University. We thank Y. Murakami for EPMA at the Advanced Research Center of Metallic Glasses, IMR, Tohoku University. This work was partly supported by a Grant-in-Aid for Scientific Research on Priority Areas (No. 451) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2008/9/15
Y1 - 2008/9/15
N2 - In order to investigate the Pb concentration dependence of the irreversibility field Hirr in the Pb-substituted Bi2Sr2CuO6+δ (Bi2.12-xPbxSr1.88CuO6+ δ), we have measured the temperature dependence of the in-plane electrical resistivity in magnetic fields up to 15 T parallel to the c-axis. It is found that Hirr increases for x ≤ 0.27 with increasing x, while it remarkably decreases for x > 0.32. Striking feature is the enhancement of Hirr around x ∼ 0.27-0.32. A possible origin of the enhancement is the two-phase microstructures consisting of modulated and modulation-free domains. In such a case, the phase boundary of the microstructures works effectively as pinning centers for vortices, in contrast to the homogeneous modulated x = 0.18 and the homogeneous modulation-free x = 0.37. Our results strongly suggest the close relation between two-phase microstructures and the enhancement of Hirr.
AB - In order to investigate the Pb concentration dependence of the irreversibility field Hirr in the Pb-substituted Bi2Sr2CuO6+δ (Bi2.12-xPbxSr1.88CuO6+ δ), we have measured the temperature dependence of the in-plane electrical resistivity in magnetic fields up to 15 T parallel to the c-axis. It is found that Hirr increases for x ≤ 0.27 with increasing x, while it remarkably decreases for x > 0.32. Striking feature is the enhancement of Hirr around x ∼ 0.27-0.32. A possible origin of the enhancement is the two-phase microstructures consisting of modulated and modulation-free domains. In such a case, the phase boundary of the microstructures works effectively as pinning centers for vortices, in contrast to the homogeneous modulated x = 0.18 and the homogeneous modulation-free x = 0.37. Our results strongly suggest the close relation between two-phase microstructures and the enhancement of Hirr.
KW - Bi-based cuprates
KW - In-plane electrical resistivity
KW - Irreversibility field
KW - Two-phase microstructures
UR - http://www.scopus.com/inward/record.url?scp=50449088170&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=50449088170&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2008.05.011
DO - 10.1016/j.physc.2008.05.011
M3 - Article
AN - SCOPUS:50449088170
SN - 0921-4534
VL - 468
SP - 1278
EP - 1280
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 15-20
ER -