Physical Review B (Condensed Matter and Materials Physics) -- June 1, 1996 -- Volume 53, Issue 22, pp. R14725-R14728 

---

Muon-spin relaxation studies of magnetic order in heavily doped La _2-xSr_xNiO_4+d

K. H. Chow, P. A. Pattenden, S. J. Blundell, W. Hayes, F. L. Pratt, and Th. Jestädt

Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom

M. A. Green, J. E. Millburn, and M. J. Rosseinsky

Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, United Kingdom

B. Hitti

TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada V6T 2A3

S. R. Dunsinger and R. F. Kiefl

Department of Physics and/or Canadian institute for Advanced Research, University of  British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

C. Chen and A. J. S. Chowdhury

Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom

(Received 12 January 1996; revised 27 February 1996)

We report mSR measurements on a series of compounds with composition La _2-xSr_xNiO_4+d where the net hole
concentration x+2d is greater than 0.4. A magnetic transition is found in all the samples studied which occurs at a composition-dependent temperature T_M. Below T_M, clear precession signals are observed in zero applied magnetic field, indicating the existence of at least short range magnetic order on a timescale greater than 10^-8s. Above T_M the correlation times decrease by several orders of magnitude.The measurements of  T_M as a function of the net hole concentration extends the determination of Neel temperatures by previous neutron diffraction measurements to higher doping levels. © 1998 The American Physical Society

PII: S0163-1829(96)50122-0
PACS: 75.25, 71.27, 76.75

Link to PRB.