Muon spin rotation measurements of heterogeneous field response in overdoped LaSrCuO

ミュウオンスピン回転による過剰ドープLaSrCuOの不均質な磁場応答の測定

MacDougall, G. J.*; Savici, A. T.*; Aczel, A. A.*; Birgeneau, R. J.*; Kim, H.*; Kim, S.-J.*; 伊藤 利充*; Rodriguez, J. A.*; Russo, P. L.*; 植村 泰朋*; 脇本 秀一  ; Wiebe, C. R.*; Luke, G. M.*

MacDougall, G. J.*; Savici, A. T.*; Aczel, A. A.*; Birgeneau, R. J.*; Kim, H.*; Kim, S.-J.*; Ito, Toshimitsu*; Rodriguez, J. A.*; Russo, P. L.*; Uemura, Yasutomo*; Wakimoto, Shuichi; Wiebe, C. R.*; Luke, G. M.*

Transverse-field muon spin rotation measurements of overdoped LaSrCuO reveal a large broadening of the local magnetic field distribution in response to applied field, persisting to high temperatures. The field response is approximately Curie-Weiss-like in temperature and is largest for the highest doping investigated. Such behavior is contrary to the canonical Fermi-liquid picture commonly associated with the overdoped cuprates and implies extensive heterogeneity in this region of the phase diagram. A possible explanation for the result lies in regions of staggered magnetization about dopant cations, analogous to what is argued to exist in underdoped systems.