Ferromagnetic Enhancement of CE-Type Spin Ordering in $(\mathrm{Pr},\mathrm{Ca}){\mathrm{MnO}}_{3}$

Ferromagnetic Enhancement of CE-Type Spin Ordering in $(\Pr, Ca) {MnO}_{3}$

S. Y. Zhou, Y. Zhu, M. C. Langner, Y.-D. Chuang, P. Yu, W. L. Yang, A. G. Cruz Gonzalez, N. Tahir, M. Rini, Y.-H. Chu, R. Ramesh, D.-H. Lee, Y. Tomioka, Y. Tokura, Z. Hussain, and R. W. Schoenlein

Phys. Rev. Lett. 106, 186404 – Published 4 May 2011

Abstract

We present resonant soft x-ray scattering results from small bandwidth manganites $(\Pr, Ca) {MnO}_{3}$ , which show that the CE-type spin ordering (SO) at the phase boundary is stabilized only below the canted antiferromagnetic transition temperature and enhanced by ferromagnetism in the macroscopically insulating state (FM-I). Our results reveal the fragility of the CE-type ordering that underpins the colossal magnetoresistance effect in this system, as well as an unexpected cooperative interplay between FM-I and CE-type SO which is in contrast to the competitive interplay between the ferromagnetic metallic state and CE-type ordering.

Received 10 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.186404

Authors & Affiliations

S. Y. Zhou^1,2,*, Y. Zhu^2,3, M. C. Langner², Y.-D. Chuang^1,†, P. Yu⁴, W. L. Yang¹, A. G. Cruz Gonzalez¹, N. Tahir^1,5, M. Rini², Y.-H. Chu⁶, R. Ramesh^2,4, D.-H. Lee^2,4, Y. Tomioka⁷, Y. Tokura^8,9, Z. Hussain¹, and R. W. Schoenlein^1,2,‡

¹Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
³Department of Applied Science, University of California, Davis, California 95616, USA
⁴Department of Physics, University of California, Berkeley, California 94720, USA
⁵National Center for Physics, Islamabad, Pakistan
⁶Department of Materials Science and Engineering, National Chiao Tung University, Hsingchu 30010, Taiwan
⁷Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 4, 1-1-1 Higashi Tsukuba 305-8562, Japan
⁸Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
⁹Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), Advanced Science Institute, RIKEN, Wako 351-0198, Japan

^*Corresponding author. szhou@lbl.gov
^†Corresponding author. ychuang@lbl.gov
^‡Corresponding author. rwschoenlein@lbl.gov.

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Vol. 106, Iss. 18 — 6 May 2011

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Figure 1
(a),(b) Phase diagrams as a function of (a) $A$ -site average ionic radius and (b) doping. The $CO / OOI$ , PI, CI, AFI, and CAF denote charge/orbital ordered insulating, paramagnetic insulating, spin-canted insulating, antiferromagnetic insulating, and canted antiferromagnetic states, respectively. (c) Schematic drawing of the CE-type $CO / OO / SO$ [24] at 50% doping. The arrows mark the directions for the OO and SO wave vectors. The two different shadings represent opposite spins on the Mn sites.Reuse & Permissions
Figure 2
(a) Schematic drawing of the experimental geometry. The azimuthal angle $ϕ$ is defined to be 0 when the $c$ axis is in the scattering plane. (b) Intensity of the ordering peak as a function of momentum transfer $q$ measured on 30% doped $(\Pr, Ca) {MnO}_{3}$ at 65 K with incident photon energies of 638.75 eV and 631 V [block arrows in panel (e)] at $ϕ = 90 °$ . (c),(d) Azimuthal angular dependence of the ordering peak intensity on (c) 30% and (d) 50% doped samples at photon energies marked by symbols in panels (e),(f). The dotted lines are fits to the data using a ${sin }^{2} (ϕ - ϕ_{0})$ function. (e),(f) Resonance profiles measured at 65 K on (e) 30% doped sample with $ϕ = 90 °$ and (f) 50% doped sample with $ϕ = 0 °$ , respectively. The dotted lines are the XAS spectra measured in the total fluorescence yield (TFY) mode (rescaled by 100 times).Reuse & Permissions
Figure 3
Temperature dependence of (a),(b) the diffraction peak at 641.6 eV with $ϕ = 0 °$ , (c) extracted intensity, (d) peak position, (e) correlation length, and (f) resonance profiles on 50% doped sample. The blue or red (darker or lighter in the printed black and white version) symbols and curves in panels (c)–(e) were taken with $ϕ = 0 °$ ( $ϕ = 90 °$ ), respectively. The inset in panel (f) shows the zoom-in of the resonance profiles at $L_{III}$ edge. The circular and square symbols in panel (f) mark the photon energies at which data in panels (c)–(e) were taken.Reuse & Permissions
Figure 4
Temperature dependence of (a) the diffraction peak, (b) extracted intensity, (c) peak position, (d) correlation length, and (e) resonance profiles measured on 30% doped sample at 652 eV with $ϕ = 90 °$ . Similar temperature dependence in peak intensity, position, and correlation length is also observed at other photon energies and also in the $ϕ = 0$ geometry (cf. Fig. S2 in the supplemental information [17]). The green (gray shading in the printed black and white version) curve and the black broken line in panel (c) show the Mn ferromagnetic moment and Mn antiferromagnetic moment (rescaled by 1.2) from neutron scattering measurements [19]. (f) A schematic drawing of the spin orientation in the canted antiferromagnetic state.Reuse & Permissions

Physical Review Letters

Ferromagnetic Enhancement of CE-Type Spin Ordering in (Pr,Ca)MnO3

S. Y. Zhou, Y. Zhu, M. C. Langner, Y.-D. Chuang, P. Yu, W. L. Yang, A. G. Cruz Gonzalez, N. Tahir, M. Rini, Y.-H. Chu, R. Ramesh, D.-H. Lee, Y. Tomioka, Y. Tokura, Z. Hussain, and R. W. Schoenlein

Phys. Rev. Lett. 106, 186404 – Published 4 May 2011

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Ferromagnetic Enhancement of CE-Type Spin Ordering in $(\Pr, Ca) {MnO}_{3}$