Limits on superconductivity-related magnetization in Sr2RuO4 and PrOs4Sb12 from scanning SQUID microscopy

作者：Hicks Clifford W^*; Kirtley John R; Lippman Thomas M; Koshnick Nicholas C; Huber Martin E; Maeno Yoshiteru; Yuhasz William M; Maple M Brian; Moler Kathryn A

来源：Physical Review B, 2010, 81(21): 214501.

DOI：10.1103/PhysRevB.81.214501

We present scanning superconducting quantum interference device microscopy data on the superconductors Sr2RuO4 (T-c=1.5 K) and PrOs4Sb12 (T-c=1.8 K). In both of these materials, superconductivity-related time-reversal symmetry-breaking fields have been observed by muon spin rotation; our aim was to visualize the structure of these fields. However, in neither Sr2RuO4 nor PrOs4Sb12 do we observe spontaneous superconductivity-related magnetization. In Sr2RuO4, many experimental results have been interpreted on the basis of a p(x)+/- ip(y) superconducting order parameter. This order parameter is expected to give spontaneous magnetic induction at sample edges and order parameter domain walls. Supposing large domains, our data restrict domain wall and edge fields to no more than similar to 0.1% and similar to 0.2% of the expected magnitude, respectively. Alternatively, if the magnetization is of the expected order, the typical domain size is limited to similar to 30 nm for random domains or similar to 500 nm for periodic domains.

• 出版日期2010-6-1