Crystal structure and high-field magnetism of La{sub 2}CuO{sub 4}
- Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, D-70569 Stuttgart (Germany)
- Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin (Germany)
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Bell Laboratories Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
- Central Research Institute of Electric Power Industry, 2-11-1 Iwato-kita, Komae, Tokyo 201-8511 (Japan)
- SNBL at ESRF, Boite Postale 220, F-38042 Grenoble Cedex 9 (France)
Neutron diffraction was used to determine the crystal structure and magnetic ordering pattern of a La{sub 2}CuO{sub 4} single crystal, with and without applied magnetic field. A previously unreported, subtle monoclinic distortion of the crystal structure away from the orthorhombic space group Bmab was detected. The distortion is also present in lightly Sr-doped crystals. A refinement of the crystal structure shows that the deviation from orthorhombic symmetry is predominantly determined to drive a continuous reorientation of the copper spins from the orthorhombic b axis to the c axis, directly confirming predictions based on prior magnetoresistance and Raman scattering experiments. A spin-flop transition induced by a c-axis oriented field previously reported for nonstoichiometric La{sub 2}CuO{sub 4} is also observed, but the transition field (11.5 T) is significantly larger than that in the previous work.
- OSTI ID:
- 20788063
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 14; Other Information: DOI: 10.1103/PhysRevB.73.144513; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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