Comparative μ+SR investigation of static magnetic order and anisotropy of the pure and Pb-doped Bi2Sr2Co2Oy layered cobalt dioxides

Jun Sugiyama, Yutaka Ikedo, Hiroshi Nozaki, Peter L. Russo, Jess H. Brewer, Eduardo J. Ansaldo, Gerald D. Morris, Kim H. Chow, Scott L. Stubbs, Daniel Andreica, Alex Amato, Takenori Fujii, Satoshi Okada, and Ichiro Terasaki
Phys. Rev. B 78, 094422 – Published 25 September 2008

Abstract

The magnetism of pure and Pb-doped Bi2Sr2Co2Oy (BSCO) crystals has been investigated with positive muon-spin rotation and relaxation (μ+SR) spectroscopy. The entire volume of both materials enters into a magnetic state at low temperatures, occurring below 4.7 K for Pb-doped BSCO and below 1.0 K for pristine BSCO. By combining μ+SR and susceptibility measurements, it is clarified that Pb-doped BSCO is a ferromagnet with a Curie temperature (TC) of 4.7 K and its ordered internal magnetic field (Hint) is almost parallel to the c axis. Since the relationship between the reduced T and reduced Hint for Pb-doped BSCO is very similar to that for BSCO, the origin of the magnetic transition in both crystals is thought to be explained by common physics. Interestingly, we also detect the existence of a magnetic anomaly far above TC. This occurs at 60K, coinciding with the metal-to-insulator transition that was observed for both materials by resistivity measurements.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
2 More
  • Received 16 April 2008

DOI:https://doi.org/10.1103/PhysRevB.78.094422

©2008 American Physical Society

Authors & Affiliations

Jun Sugiyama1,*, Yutaka Ikedo1, Hiroshi Nozaki1, Peter L. Russo2, Jess H. Brewer3, Eduardo J. Ansaldo2, Gerald D. Morris2, Kim H. Chow4, Scott L. Stubbs5, Daniel Andreica6, Alex Amato7, Takenori Fujii8, Satoshi Okada9, and Ichiro Terasaki9

  • 1Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
  • 2TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
  • 3TRIUMF, CIfAR and Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
  • 4Department of Physics, University of Alberta, Edmonton, AB, T6G 2G7, Canada
  • 5Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
  • 6Faculty of Physics, Babes-Bolyai University, 3400 Cluj-Napoca, Romania
  • 7Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 8Cryogenic Center, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
  • 9Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan

  • *e0589@mosk.tytlabs.co.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 78, Iss. 9 — 1 September 2008

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×