skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Crystal structure and high-field magnetism of La{sub 2}CuO{sub 4}

Abstract

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.

Authors:
 [1];  [2]; ;  [1];  [3];  [4];  [5];  [6]; ;  [7];  [8];  [9]
  1. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, D-70569 Stuttgart (Germany)
  2. (Germany)
  3. Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin (Germany)
  4. Brookhaven National Laboratory, Upton, New York 11973 (United States)
  5. (United States)
  6. Bell Laboratories Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
  7. Central Research Institute of Electric Power Industry, 2-11-1 Iwato-kita, Komae, Tokyo 201-8511 (Japan)
  8. SNBL at ESRF, Boite Postale 220, F-38042 Grenoble Cedex 9 (France)
  9. (Switzerland)
Publication Date:
OSTI Identifier:
20788063
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 14; Other Information: DOI: 10.1103/PhysRevB.73.144513; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; COPPER; CUPRATES; DOPED MATERIALS; HIGH-TC SUPERCONDUCTORS; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MAGNETORESISTANCE; MONOCLINIC LATTICES; MONOCRYSTALS; NEUTRON DIFFRACTION; ORTHORHOMBIC LATTICES; RAMAN EFFECT; SPIN; SYMMETRY

Citation Formats

Reehuis, M., Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin, Ulrich, C., Keimer, B., Prokes, K., Gozar, A., Bell Laboratories Lucent Technologies, Murray Hill, New Jersey 07974, Blumberg, G., Komiya, Seiki, Ando, Yoichi, Pattison, P., and Laboratory of Crystallography, Swiss Federal Institute of Technology, BSP-Dorigny, CH-1015 Lausanne. Crystal structure and high-field magnetism of La{sub 2}CuO{sub 4}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.1.
Reehuis, M., Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin, Ulrich, C., Keimer, B., Prokes, K., Gozar, A., Bell Laboratories Lucent Technologies, Murray Hill, New Jersey 07974, Blumberg, G., Komiya, Seiki, Ando, Yoichi, Pattison, P., & Laboratory of Crystallography, Swiss Federal Institute of Technology, BSP-Dorigny, CH-1015 Lausanne. Crystal structure and high-field magnetism of La{sub 2}CuO{sub 4}. United States. doi:10.1103/PHYSREVB.73.1.
Reehuis, M., Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin, Ulrich, C., Keimer, B., Prokes, K., Gozar, A., Bell Laboratories Lucent Technologies, Murray Hill, New Jersey 07974, Blumberg, G., Komiya, Seiki, Ando, Yoichi, Pattison, P., and Laboratory of Crystallography, Swiss Federal Institute of Technology, BSP-Dorigny, CH-1015 Lausanne. Sat . "Crystal structure and high-field magnetism of La{sub 2}CuO{sub 4}". United States. doi:10.1103/PHYSREVB.73.1.
@article{osti_20788063,
title = {Crystal structure and high-field magnetism of La{sub 2}CuO{sub 4}},
author = {Reehuis, M. and Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin and Ulrich, C. and Keimer, B. and Prokes, K. and Gozar, A. and Bell Laboratories Lucent Technologies, Murray Hill, New Jersey 07974 and Blumberg, G. and Komiya, Seiki and Ando, Yoichi and Pattison, P. and Laboratory of Crystallography, Swiss Federal Institute of Technology, BSP-Dorigny, CH-1015 Lausanne},
abstractNote = {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.},
doi = {10.1103/PHYSREVB.73.1},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 14,
volume = 73,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}
  • A self-consistent, regioselective mechanism for the alkylnitrosurea (ANV) alkylation of DNA. The proposed mechanism is an attractive alternative to carbocation-like intermediates. Environmental mutagens and carcinogens may have similar mechanisms.
  • We have grown superlattices of (La,Sr){sub 2}CuO{sub 4}/Sm{sub 2}CuO{sub 4} (1/1 to 120/120) onto SrTiO{sub 3} substrates by an excimer laser deposition technique. These superlattices can be classified into three regions. For the short periodicity of the stacking up to 4/4, new structures are constructed having a large unit cell made of a CuO{sub 5} pyramid, CuO{sub 6} octahedral, and CuO{sub 4} sheet. For the large periodicity more than 60/60, the superlattices exhibit the same superconducting behavior as the standard (La,Sr){sub 2}CuO{sub 4}. The superlattices of the intermediate periodicity, from 60/60 to 15/15 on the other hand, show changes inmore » the critical temperature as the variation of the stacking periodicity. This phenomenon is explained to be derived from a pressure effect caused by a lattice mismatch between (La,Sr){sub 2}CuO{sub 4} and Sm{sub 2}CuO{sub 4} layers.« less
  • Local-density-functional calculations have been performed to study the electronic structure and magnetism of 3d transition-metal ions (Cr, Mn, Fe, Co, and Ni) substituting for the Cu ion in La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4}. These systems are simulated by small clusters which are surrounded by over 5000 point charges. It is found that all the substituting ions possess local magnetic moments. Through a systematic comparison we find that the Cu-O system has the smallest {ital p}-{ital d} separation and the largest {ital p}-{ital d} hybridization. The Cu-O system has the smallest local magnetic moment, which can be reduced to zeromore » by hole doping. We also find that removing an electron from these systems further increases the {ital p}-{ital d} hybridization. The crystal-field splittings of these transition-metal oxide systems are found to remain nearly constant at about 0.1 Ry, while the Jahn-Teller splittings vary considerably, depending on the manner in which single-particle levels are filled. Hyperfine fields have been calculated for the Fe ion at both trivalent and divalent states. These calculations are compared with available experimental measurements.« less
  • In this study, we used atomic-layer molecular beam epitaxy (ALL-MBE) to synthesize bilayer films of a cuprate metal (La 1.65Sr 0.45CuO 4) and a cuprate insulator (La 2CuO 4), in which interface superconductivity occurs in a layer that is just one-half unit cell thick. We have studied the magnetic field and temperature dependence of the complex sheet conductance, σ(ω), of these films, and compared them to κκ-(BEDT-TTF) 2Cu[N(CN) 2]Br single crystals. The magnetic field H was applied both parallel and perpendicular to the 2D conducting layers. Experiments have been carried out at frequencies between 23 kHz and 50 MHz usingmore » either two-coil mutual inductance technique, or the LC resonators with spiral or rectangular coils. The real and the imaginary parts of the mutual-inductance M(T,ω) between the coil and the sample were measured and converted to complex conductivity. For H perpendicular to the conducting layers, we observed almost identical behavior in both films and κ-Br single crystals: (i) the transition onset in the inductive response, L k –1(T) occurs at a temperature lower by 2 K than in Re σ(T), (ii) this shift is almost constant with magnetic field up to 8 T; (iii) the vortex diffusion constant D(T) is exponential due to pinning of vortex cores. These results can be described by the extended dynamic theory of the Berezinski–Kosterlitz–Thouless (BKT) transition and dynamics of bound vortex–antivortex pairs with short separation lengths.« less
  • An orbital polarization correction to local spin density (LSD) theory is developed in a crystal field basis, and applied to FeO, CoO, NiO, and La{sub 2}CuO{sub 4}. The result is a substantial enhancement of the LSD band gap for NiO, and the creation of an insulating ground state for FeO, CoO, and La{sub 2}CuO{sub 4}.