Experimental Observation of the Crystallization of a Paired Holon State

Rusydi, A.; Ku, W.; Schulz, B.; Rauer, R.; Mahns, I.; Qi, D.; Gao, X.; Wee, A. T. S.; Abbamonte, P.; Eisaki, H.; Fujimaki, Y.; Uchida, S.; Rübhausen, M.

doi:10.1103/physrevlett.105.026402

Title: Experimental Observation of the Crystallization of a Paired Holon State

Journal Article · 07 July 2010 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.105.026402 · OSTI ID:1958856

Rusydi, A. ^[1]; Ku, W. ^[2]; Schulz, B. ^[3]; Rauer, R. ^[3]; Mahns, I. ^[3]; Qi, D. ^[4]; Gao, X. ^[4]; Wee, A. T. S. ^[4]; Abbamonte, P. ^[5]; Eisaki, H. ^[6]; Fujimaki, Y. ^[7]; Uchida, S. ^[7]; Rübhausen, M. ^[8]

National Univ. of Singapore (Singapore); Univ. of Hamburg (Germany); University of Illinois
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Hamburg (Germany)
National Univ. of Singapore (Singapore)
Univ. of Illinois at Urbana-Champaign, IL (United States)
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
Univ. of Tokyo (Japan)
Univ. of Hamburg (Germany); National Univ. of Singapore (Singapore)

Here, an excitation at 201 meV is observed in the doped-hole ladder cuprate Sr₁₄Cu₂₄O₄₁, using ultraviolet resonance Raman scattering with incident light at 3.7 eV polarized along the rungs. The excitation is of charge nature, with a temperature independent excitation energy, and can be understood via an intraladder pair-breaking process. The intensity tracks closely the order parameter of the charge density wave in the ladder CDW_L, but persists above its transition temperature T_{CDW_L}, indicating a strong local pairing above the T_{CDW_L}. The 201 meV excitation vanishes in La₆Ca₈Cu₂₄O_41+δ, and La₅Ca₉Cu₂₄O₄₁ which are samples with no holes in the ladders. Our results suggest that the doped holes in the ladder are composite bosons consisting of paired holons that order below T_CDW.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: Agency for Science, Technology and Research (A*STAR); German Research Foundation (DFG); National Research Foundation of Korea (NRF); National University of Singapore; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-98CH10886; FG02-06ER46285

OSTI ID:: 1958856

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 105; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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