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Phys. Rev. Lett. 102, 237201 (2009) [4 pages]

Pressure-Induced Magnetic Transition in Manganite (La0.75Ca0.25MnO3)

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Yang Ding1,*, Daniel Haskel2, Yuan-Chieh Tseng2,3, Eiji Kaneshita2, Michel van Veenendaal2,4, J. F. Mitchell5, Stanislav V. Sinogeikin6, Vitali Prakapenka7, and Ho-kwang Mao1,6,8
1HPSynC, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
3Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60201, USA
4Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA
5Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
6HPCAT, Carnegie Institution of Washington, Building 434E, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
7GSECARS, University of Chicago, Advanced Photon Source, Building 434A, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
8Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, D.C. 20015, USA

Received 30 July 2008; revised 29 January 2009; published 10 June 2009

Low temperature Mn K-edge x-ray magnetic circular dichroism and x-ray diffraction measurements were carried out to investigate the stability of the ferromagnetic ground state in manganite La0.75Ca0.25MnO3 under nearly uniform compression using diamond anvil cells. The magnetic dichroism signal gradually decreases with pressure and disappears at 23 GPa, and meanwhile a uniaxial compression of MnO6 octahedra along the b axis is observed to continuously increase with pressure and become anomalously large at 23.5 GPa. These changes are attributed to a ferromagnetic-antiferromagnetic transition that is associated with orbital ordering at high pressure.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.237201
DOI:
10.1103/PhysRevLett.102.237201
PACS:
75.30.−m, 62.50.−p, 75.50.−y, 78.70.Dm

*yangding@aps.anl.gov

 
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