Critical Electron-Paramagnetic-Resonance Spin Dynamics in Ni<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cl</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

R. J. Birgeneau; L. W. Rupp, Jr; H. J. Guggenheim; P. A. Lindgard; D. L. Huber

doi:10.1103/PhysRevLett.30.1252

Critical Electron-Paramagnetic-Resonance Spin Dynamics in Ni ${Cl}_{2}$

R. J. Birgeneau, L. W. Rupp, Jr., H. J. Guggenheim, P. A. Lindgard, and D. L. Huber

Phys. Rev. Lett. 30, 1252 – Published 18 June 1973

Abstract

We have studied the critical behavior of the electron-paramagnetic-resonance linewidth in the planar $XY$ antiferromagnet Ni ${Cl}_{2}$ ; it is found that the linewidth diverges like $ξ \sim {(T - T_{N})}^{- 0.7}$ rather than $ξ^{\frac{5}{2}}$ predicted by the current random-phase-approximation theory.

Received 9 April 1973

DOI:https://doi.org/10.1103/PhysRevLett.30.1252

Authors & Affiliations

R. J. Birgeneau, L. W. Rupp, Jr., H. J. Guggenheim, and P. A. Lindgard^*

Bell Laboratories, Murray Hill, New Jersey 07974

D. L. Huber^†

Brookhaven National Laboratory, Upton, New York 11973

^*Present address: Atomic Energy Commission Research Establishment Riso, Roskilde, Denmark.
^†1973 Guggenheim Fellow; Work at Brookhaven performed under the auspices of the U. S. Atomic Energy Commission.