Effects of Reduced Dimensionality on Spin Dynamics in the Layered Perovskite <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">La</mi></mrow><mrow><mn>1.4</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Sr</mi></mrow><mrow><mn>1.6</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Mn</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>

R. H. Heffner; D. E. MacLaughlin; G. J. Nieuwenhuys; T. Kimura; G. M. Luke; Y. Tokura; Y. J. Uemura

doi:10.1103/PhysRevLett.81.1706

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Effects of Reduced Dimensionality on Spin Dynamics in the Layered Perovskite ${La}_{1.4} {Sr}_{1.6} {Mn}_{2} O_{7}$

R. H. Heffner¹, D. E. MacLaughlin², G. J. Nieuwenhuys³, T. Kimura⁴, G. M. Luke⁵, Y. Tokura^4,6, and Y. J. Uemura⁵

¹Los Alamos National Laboratory, Los Alamos, New Mexico 87545
²Department of Physics, University of California, Riverside, California 92521
³Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands
⁴Joint Research Center for Atomic Technology (JRCAT), Tsukuba 305, Japan
⁵Department of Physics, Columbia University, New York, New York 10027
⁶Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

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Phys. Rev. Lett. 81, 1706 – Published 24 August, 1998

DOI: https://doi.org/10.1103/PhysRevLett.81.1706

Abstract

We report zero-field muon spin rotation data in single crystals of ${La}_{1.4} {Sr}_{1.6} {Mn}_{2} O_{7}$ for $T = 5 - 325 K$ . The spin-lattice relaxation rate is spatially inhomogeneous below the 3D magnetic transition temperature $T_{C}$ and anisotropic above $T_{C}$ . We find evidence against 2D spin ordering or in-plane correlations above $T_{C}$ . Additionally, the very slow spin fluctuations found below $T_{C}$ in cubic (3D) perovskites like $(La, Ca) {MnO}_{3}$ or $(La, Sr) {MnO}_{3}$ , and attributed to relatively small magnetoelastic polarons, are absent in ${La}_{1.4} {Sr}_{1.6} {Mn}_{2} O_{7}$ . This suggests that the polaron size in the layered material is significantly larger than in the 3D perovskites.

References (23)

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[c1] G. H. Jonker and J. H. van Santen, Physics 16, 337 (1950); E. O. Wollan and W. C. Koehler, Phys. Rev. 100, 548 (1955); J. Volger, Physica (Utrecht) 20, 49 (1954).

[c2] R. M. Kusters et al., Physica (Amsterdam) 155B, 362 (1989); R. von Helmholtz et al., Phys. Rev. Lett. 71, 2331 (1993).

[c3] A. Urushibara et al., Phys. Rev. B 51, 14 103 (1995); P. Schiffer et al., Phys. Rev. Lett. 75, 3336 (1995).

[c4] N. Furukawa, J. Phys. Soc. Jpn. 64, 3164 (1995); A. J. Millis et al., Phys. Rev. Lett. 74, 5144 (1995); H. Röder et al., 76, 1356 (1996).

[c5] M. F. Hundley et al., Appl. Phys. Lett. 67, 860 (1995); M. Jaime et al., Phys. Rev. Lett. 78, 951 (1997).

[c6] S. Billinge et al., Phys. Rev. Lett. 77, 715 (1996); J. M. De Teresa et al., Nature (London) 386, 256 (1997).

[c7] C. H. Booth et al., Phys. Rev. Lett. 80, 853 (1998).

[c8] R. H. Heffner et al., Phys. Rev. Lett. 77, 1869 (1996); , Physica (Amsterdam) 230–232B, 759 (1997).

[c9] J. W. Lynn et al., Phys. Rev. Lett. 76, 4046 (1996); L. Vasiliu-Doloc et al., J. Appl. Phys. 81, 5491 (1997).

[c10] T. Kimura et al., Science 274, 1698 (1996).

[c11] T. Kimura et al., Phys. Rev. Lett. 79, 3720 (1997).

[c12] D. Argyriou et al., J. Appl. Phys. 83, 6374 (1998).

[c13] T. Moriya, Prog. Theor. Phys. 28, 371 (1962).

[c14] E. Holzschuh et al., Hyperfine Interact. 8, 615 (1981); C. Boekema et al., Phys. Rev. B 33, 210 (1986); N. Nishida et al., Hyperfine Interact. 63, 183 (1990); M. Weber et al., 63, 207 (1990); W. K. Dawson et al., 63, 219 (1990).

[c15] S. N. Ruddlesden and P. Popper, Acta Crystallogr. 11, 54 (1958).

[c16] B. Hitti et al., Hyperfine Interact. 63, 287 (1990).

[c17] A. Yaouanc, P. Dalmas de Réotier, and E. Frey, Phys. Rev. B 47, 796 (1993).

[c18] A. Yaouanc and P. Dalmas de Réotier, J. Phys. Condens. Matter 3, 6195 (1991).

[c19] R. H. Heffner, M. F. Hundley, and C. W. Booth, Mater. Res. Soc. Symp. Proc. 494, 275 (1998).

[c20] T. Ishikawa et al., Phys. Rev. B 57, R8079 (1998).

[c21] D. Louca, G. Kwei, and J. F. Mitchell (to be published).

[c22] D. Louca et al., Phys. Rev. B 56, R8475 (1997).

[c23] H. Röder, Bull. Am. Phys. Soc. 43, 471 (1998).

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Effects of Reduced Dimensionality on Spin Dynamics in the Layered Perovskite ${La}_{1.4} {Sr}_{1.6} {Mn}_{2} O_{7}$

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Effects of Reduced Dimensionality on Spin Dynamics in the Layered Perovskite La1.4Sr1.6Mn2O7

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References (23)

Effects of Reduced Dimensionality on Spin Dynamics in the Layered Perovskite ${La}_{1.4} {Sr}_{1.6} {Mn}_{2} O_{7}$