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

Title: Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} Superconductor

Abstract

High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La{sub 1.895}Sr{sub 0.105}CuO{sub 4} (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum transfer Q{sub IC}=(0.5,0.5{+-}{delta},0),(0.5{+-}{delta},0.5,0) exhibits an anomaly at the superconducting T{sub c} which broadens and shifts to lower temperature upon the application of a magnetic field along the c axis. A field-induced enhancement of the spectral weight is observed, but only at finite energy transfers and in an intermediate temperature range. These observations establish the opening of a strongly downward renormalized spin gap in the underdoped regime of LSCO. This behavior contrasts with the observed doping dependence of most electronic energy features.

Authors:
; ; ; ;  [1]; ;  [2];  [1];  [3];  [1];  [4];  [5];  [6]; ; ;  [7]; ;  [8]; ; more »;  [9] « less
  1. Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI (Switzerland)
  2. Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI (Switzerland)
  3. (EPFL), CH-1015 Lausanne (Switzerland)
  4. (Denmark)
  5. London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London (United Kingdom)
  6. (United Kingdom)
  7. Institut Laue-Langevin, BP 156, F-38042 Grenoble (France)
  8. BENSC Hahn-Meitner-Institut, 14109 Berlin Wannsee (Germany)
  9. Department of Physics, Hokkaido University-Sapporo 060-0810 (Japan)
Publication Date:
OSTI Identifier:
20955476
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevLett.98.077004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPPER OXIDES; ENERGY TRANSFER; EXCITATION; INELASTIC SCATTERING; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MOMENTUM TRANSFER; NEUTRONS; SPIN; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE

Citation Formats

Chang, J., Gilardi, R., Pailhes, S., Niedermayer, Ch., Mesot, J., Schnyder, A. P., Mudry, C., Roennow, H. M., Laboratory for Quantum Magnetism, Ecole Polytechnique Federale de Lausanne, Christensen, N. B., Risoe National Laboratory, DK-4000 Roskilde, McMorrow, D. F., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, Hiess, A., Stunault, A., Enderle, M., Lake, B., Sobolev, O., Momono, N., Oda, M., and Ido, M. Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} Superconductor. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.077004.
Chang, J., Gilardi, R., Pailhes, S., Niedermayer, Ch., Mesot, J., Schnyder, A. P., Mudry, C., Roennow, H. M., Laboratory for Quantum Magnetism, Ecole Polytechnique Federale de Lausanne, Christensen, N. B., Risoe National Laboratory, DK-4000 Roskilde, McMorrow, D. F., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, Hiess, A., Stunault, A., Enderle, M., Lake, B., Sobolev, O., Momono, N., Oda, M., & Ido, M. Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} Superconductor. United States. doi:10.1103/PHYSREVLETT.98.077004.
Chang, J., Gilardi, R., Pailhes, S., Niedermayer, Ch., Mesot, J., Schnyder, A. P., Mudry, C., Roennow, H. M., Laboratory for Quantum Magnetism, Ecole Polytechnique Federale de Lausanne, Christensen, N. B., Risoe National Laboratory, DK-4000 Roskilde, McMorrow, D. F., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, Hiess, A., Stunault, A., Enderle, M., Lake, B., Sobolev, O., Momono, N., Oda, M., and Ido, M. Fri . "Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} Superconductor". United States. doi:10.1103/PHYSREVLETT.98.077004.
@article{osti_20955476,
title = {Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} Superconductor},
author = {Chang, J. and Gilardi, R. and Pailhes, S. and Niedermayer, Ch. and Mesot, J. and Schnyder, A. P. and Mudry, C. and Roennow, H. M. and Laboratory for Quantum Magnetism, Ecole Polytechnique Federale de Lausanne and Christensen, N. B. and Risoe National Laboratory, DK-4000 Roskilde and McMorrow, D. F. and ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX and Hiess, A. and Stunault, A. and Enderle, M. and Lake, B. and Sobolev, O. and Momono, N. and Oda, M. and Ido, M.},
abstractNote = {High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La{sub 1.895}Sr{sub 0.105}CuO{sub 4} (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum transfer Q{sub IC}=(0.5,0.5{+-}{delta},0),(0.5{+-}{delta},0.5,0) exhibits an anomaly at the superconducting T{sub c} which broadens and shifts to lower temperature upon the application of a magnetic field along the c axis. A field-induced enhancement of the spectral weight is observed, but only at finite energy transfers and in an intermediate temperature range. These observations establish the opening of a strongly downward renormalized spin gap in the underdoped regime of LSCO. This behavior contrasts with the observed doping dependence of most electronic energy features.},
doi = {10.1103/PHYSREVLETT.98.077004},
journal = {Physical Review Letters},
number = 7,
volume = 98,
place = {United States},
year = {Fri Feb 16 00:00:00 EST 2007},
month = {Fri Feb 16 00:00:00 EST 2007}
}
  • The magnetoresistance of underdoped La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO films with {ital x}=0.048 and 0.051 is studied in magnetic fields up to 8.5T and at temperatures down to 30mK. The results indicate that the magnetic-field induced superconductor-insulator (SI) transition is qualitatively different from the reentrant transition described for indium oxide and interpreted as leading to a {open_quote}{open_quote}bosonic insulator{close_quote}{close_quote} phase. The ground state in the absence of superconductivity appears to be insulating. The transitions become narrower below 1K and show that the resistive critical field diverges approaching zero temperature, as has also been observed in other high-{ital T}{sub {ital c}} systems.more » {copyright} {ital 1996 The American Physical Society.}« less
  • We present angle-resolved photoemission spectroscopy data on moderately underdoped La{sub 1.855}Sr{sub 0.145}CuO{sub 4} at temperatures below and above the superconducting transition temperature. Unlike previous studies of this material, we observe sharp spectral peaks along the entire underlying Fermi surface in the superconducting state. These peaks trace out an energy gap that follows a simple d-wave form, with a maximum superconducting gap of 14 meV. Our results are consistent with a single gap picture for the cuprates. Furthermore our data on the even more underdoped sample La{sub 1.895}Sr{sub 0.105}CuO{sub 4} also show sharp spectral peaks, even at the antinode, with amore » maximum superconducting gap of 26 meV.« less
  • The authors investigate the electronic states of underdoped La{sub 2{minus}x}SR{sub x}CuO{sub 4} (LSCO) by using a microscopic model, i.e., t-t{prime}-t{double{underscore}prime}-J model, containing charge stripes. The numerically exact diagonalization calculation is employed on small clusters. The physical properties observed in the angle-resolved photoemission and optical conductivity experiments are consistently explained in the model with vertical stripes, but not diagonal ones. These results demonstrate a crucial role of the vertical stripes in underdoped LSCO.
  • 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
  • We report 139La nuclear magnetic resonance studies performed on a La 1.875Ba 0.125CuO 4 single crystal. The data show that the structural phase transitions (high-temperature tetragonal → low-temperature orthorhombic → low-temperature tetragonal phase) are of the displacive type in this material. The 139La spin-lattice relaxation rate T –1 1 sharply upturns at the charge-ordering temperature T CO = 54 K, indicating that charge order triggers the slowing down of spin fluctuations. Detailed temperature and field dependencies of the T –1 1 below the spin-ordering temperature T SO=40 K reveal the development of enhanced spin fluctuations in the spin-ordered state formore » H ∥ [001], which are completely suppressed for large fields along the CuO 2 planes. Lastly, our results shed light on the unusual spin fluctuations in the charge and spin stripe ordered lanthanum cuprates.« less