X-ray and neutron scattering

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Magnetic Order and Dynamics in Stripe-Ordered La2-xSrxNiO4

(2003)

Authors:

AT Boothroyd, PG Freeman, D Prabhakaran, M Enderle, J Kulda
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Spin excitations in stripe-ordered La2-xSrxNiO4 (x=0.275 and 1/3)

(2003)

Authors:

AT Boothroyd, PG Freeman, D Prabhakaran, H Woo, K Nakajima, JM Tranquada, K Yamada, CD Frost
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Quantum correlations between protons in potassium bicarbonate

Journal of Physics Condensed Matter IOP Publishing 15:29 (2003) 4937

Authors:

DA Keen, SW Lovesey
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High-pressure x-ray scattering of oxides with a nanoscale local structure: Application toNa1/2Bi1/2TiO3

Physical Review B American Physical Society (APS) 68:1 (2003) 014113

Authors:

J Kreisel, P Bouvier, B Dkhil, PA Thomas, AM Glazer, TR Welberry, B Chaabane, M Mezouar
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Charge ordering and structural distortions at low temperature in La2−2xSr1 + 2xMn2O7 (x = 0.475 and 0.5)

Physical Review B - Condensed Matter and Materials Physics 67:20 (2003)

Authors:

SB Wilkins, PD Spencer, TAW Beale, PD Hatton, MV Zimmermann, SD Brown, D Prabhakaran, AT Boothroyd

Abstract:

In this paper we present x-ray scattering results of charge and orbital ordering in the bilayer manganite La2−2xSr1+2xMn2O7 with doping levels x = 0.5 and x = 0.475. Using high-energy x-ray scattering, the structural modulation due to the Jahn-Teller ordering and the charge ordering due to the Mn3+/Mn4+ pattern have been measured. Both the x = 0.5 and x = 0.475 samples are found to display charge and Jahn-Teller order. We have confirmed that the wave vectors of the Jahn-Teller order, charge order, and orbital order are (Formula presented), (Formula presented) and (Formula presented). The origin of these has been confirmed by resonant x-ray scattering in the vicinity of the Mn K edge using polarization analysis. Contrary to previous studies, the Jahn-Teller order is found to be not reentrant, but is found to reduce in intensity at temperatures below 140 K for both samples. Charge ordering was also detected in the x = 0.5 sample below this temperature. © 2003 The American Physical Society.
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