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Title: Absence of long-ranged charge order in Na x Ca 2 – x Cu O 2 Cl 2 ( x = 0.08 )

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1];  [2];  [3];  [3];  [4];  [4];  [5]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Illinois, Urbana, IL (United States)
  2. RIKEN/SPring-8, Hyogo (Japan)
  3. Univ. of Tokyo, Chiba (Japan)
  4. Kyoto Univ. (Japan)
  5. Univ. of Tokyo, Chiba (Japan); CREST-JST, Chiba (Japan); RIKEN, Waco (Japan)
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Recent scanning-tunneling spectroscopy (STS) studies of the cupric oxychloride NaxCa2–xCuO2Cl2 (NCCOC) have uncovered a periodic 4a × 4a density of states (DOS) modulation, termed a “checkerboard” [T. Hanaguri et al., Nature (London) 430, 1001 (2004)]. The periodicity of this phase is the same as that of the “stripe” charge order observed with neutron scattering in the very similar systems La1.48Nd0.4Sr0.12CuO4 (LNSCO) [J. M. Tranquada et al., Nature (London) 375, 561 (1995)] and La1.875Ba0.125CuO4 (LBCO) [M. Fujita et al., Phys. Rev. Lett. 88, 167008 (2002)]. This raises the question of whether the stripes are, in fact, actually checkerboards. Unfortunately, NCCOC samples are very small and LBCO and LNSCO samples do not cleave, so neutron and STS measurements cannot be carried out on the same system. To determine the relationship between stripes and checkers, we used resonant soft-x-ray scattering, previously applied to LBCO [P. Abbamonte et al., Nat. Phys. 1, 155 (2005)], to study single crystals of NCCOC. No evidence was seen for a 4a × 4a DOS modulation, indicating that the checkerboard effect is not directly related to the stripe modulation in LBCO. Here, we place an upper bound on the product of the charge amplitude and the square of the in-plane correlation length of 2.3 × 103 hole Å2.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-06ER46285; AC02-98CH10886
OSTI ID:
1958867
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 7; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

References (23)

Quantum magnetic excitations from stripes in copper oxide superconductors journal June 2004
A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2 journal August 2004
Charge dynamics of Ca 2 − x Na x CuO 2 Cl 2 as a correlated electron system with the ideal tetragonal lattice journal October 2004
Imaging Nanoscale Electronic Inhomogeneity in the Lightly Doped Mott Insulator C a 2 − x N a x C u O 2 C l 2 journal August 2004
Unoccupied electronic structure ofSr2CuO2Cl2andBa2Cu3O4Cl2: Experiment and theory journal February 1998
Hole distribution in ( Sr , Ca , Y , La ) 14 Cu 24 O 41 ladder compounds studied by x-ray absorption spectroscopy journal December 2000
Crystallization of charge holes in the spin ladder of Sr14Cu24O41 journal October 2004
Missing Quasiparticles and the Chemical Potential Puzzle in the Doping Evolution of the Cuprate Superconductors journal December 2004
Spatially modulated 'Mottness' in La2-xBaxCuO4 journal December 2005
A Structural Probe of the Doped Holes in Cuprate Superconductors journal July 2002
Synthesis, structure, and superconductivity of Ca2−Na CuO2Cl2 journal August 1996
Growth of Na-Doped Ca 2 CuO 2 Cl 2 Single Crystals under High Pressures of Several GPa journal October 2002
Fully gapped single-particle excitations in lightly doped cuprates journal February 2004
Orbital character of states at the Fermi level in La 2 − x Sr x CuO 4 and R 2 − x Ce x CuO 4 ( R =Nd,Sm) journal February 1993
Synchrotron x-ray diffraction study of a charge stripe order in 1 8 -doped La 1.875 Ba 0.125 − x Sr x CuO 4 journal April 2003
Out-of-plane orbital characters of intrinsic and doped holes in La 2 − x Sr x CuO 4 journal April 1992
Evolution of a metal to insulator transition in Ca 2 − x Na x Cu O 2 Cl 2 as seen by angle-resolved photoemission journal April 2003
Electronic states in La 2 − x Sr x CuO 4 + δ probed by soft-x-ray absorption journal January 1991
Nodal Quasiparticles and Antinodal Charge Ordering in Ca2-xNaxCuO2Cl2 journal February 2005
Neutron-scattering study of stripe-phase order of holes and spins in La 1.48 Nd 0.4 Sr 0.12 CuO 4 journal September 1996
Surface pinning of fluctuating charge order: An extraordinary surface phase transition journal June 2005
Hard–X-ray diffraction study of charge stripe order in La 1.48 Nd 0.4 Sr 0.12 CuO 4 journal March 1998
Probable hole-doped superconductivity without apical oxygens in (Ca, Na)2CuO2CI2 journal September 1994

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Resonant soft x-ray scattering
electronic crystals