Dynamic frustrated magnetism in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Tb</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Ti</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>7</mn></mrow></msub></mrow></math></span> at 50 mK

J. S. Gardner; A. Keren; G. Ehlers; C. Stock; Eva Segal; J. M. Roper; B. Fåk; M. B. Stone; P. R. Hammar; D. H. Reich; B. D. Gaulin

doi:10.1103/PhysRevB.68.180401

Rapid Communication

Dynamic frustrated magnetism in ${Tb}_{2} {Ti}_{2} O_{7}$ at 50 mK

J. S. Gardner, A. Keren, G. Ehlers, C. Stock, Eva Segal, J. M. Roper, B. Fåk, M. B. Stone, P. R. Hammar, D. H. Reich, and B. D. Gaulin

Phys. Rev. B 68, 180401(R) – Published 3 November 2003

Abstract

The low temperature $(T < 1 K)$ properties of the cooperative paramagnet ${Tb}_{2} {Ti}_{2} O_{7}$ have been studied by ac susceptibility, neutron diffraction and neutron spin echo techniques. Like several other frustrated magnets, ${Tb}_{2} {Ti}_{2} O_{7},$ is believed to remain paramagnetic down to $\sim 0.07 K .$ However, recent studies [Yasui et al., J. Phys. Soc. Jpn. 71, 599 (2002), for example] suggest that ${Tb}_{2} {Ti}_{2} O_{7}$ enters an ordered, albeit glassy, state at a relatively high temperature, $\sim 1.5 K .$ Our results confirm that the majority of the spins in ${Tb}_{2} {Ti}_{2} O_{7}$ fluctuate very rapidly, even at 50 mK and that static, spatial correlations do not develop beyond nearest neighbor at similar temperatures. We suggest that the observation of a partial freezing of this magnetic system, at finite temperature, is a result of a small fraction of spins freezing around defects in the stoichiometric crystal structure.

Received 28 July 2003

DOI:https://doi.org/10.1103/PhysRevB.68.180401

Authors & Affiliations

J. S. Gardner^1,2,3, A. Keren⁴, G. Ehlers^5,*, C. Stock³, Eva Segal⁴, J. M. Roper⁶, B. Fåk^7,†, M. B. Stone^8,‡, P. R. Hammar^8,§, D. H. Reich⁸, and B. D. Gaulin⁹

¹Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
²NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA
³National Research Council, NPMR, Chalk River Laboratories, Chalk River, Ontario, K0J 1J0, Canada
⁴Department of Physics, Technion - Israel Institute of Technology, Haifa 32000, Israel
⁵Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156 - 38042 Grenoble Cedex 9, France
⁶MST-8 Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁷ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom
⁸Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
⁹Department of Physics and Astronomy, Canadian Institute for Advanced Research, McMaster University, Hamilton, Ontario, L8S 4M1, Canada

^*Present addresses: *SNS Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.
^†DRFMC/SPSMS, CEA Grenoble, France.
^‡Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
^§Axcelis Corp. Rockville, Maryland, USA.

References (Subscription Required)

Click to Expand

Issue

Vol. 68, Iss. 18 — 1 November 2003

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review B

covering condensed matter and materials physics