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Absence of long-ranged charge order in Nax Ca 2–x Cu O2 Cl2 (x=0.08)

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [6]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Illinois, Urbana, IL (United States); University of Illinois
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Illinois, Urbana, IL (United States)
  3. RIKEN/SPring-8, Hyogo (Japan)
  4. Univ. of Tokyo, Chiba (Japan)
  5. Kyoto Univ. (Japan)
  6. Univ. of Tokyo, Chiba (Japan); CREST-JST, Chiba (Japan); RIKEN, Waco (Japan)
+ Show Author Affiliations
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, Urbana, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-98CH10886; FG02-06ER46285
OSTI ID:
1958867
Alternate ID(s):
OSTI ID: 930630
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 7 Vol. 75; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

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