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• W1626006883 abstract "Phonon-assisted two-magnon absorption is studied in the spin- 1/2 two-leg ladders of (Ca,La)(14)Cu(24)O(41) for E parallel c (legs) and E parallel a (rungs). We verify the theoretically predicted existence of two-magnon singlet bound states, which give rise to peaks at approximately equal to 2140 and 2800 cm(-1). The two-magnon continuum is observed at approximately equal to 4000 cm(-1). Two different theoretical approaches (Jordan-Wigner fermions and perturbation theory) describe the data very well for J parallel approximately equal to 1020-1100 cm(-1), J parallel/J perpendicular approximately equal to 1-1.2. At high energies, the magnetic contribution to sigma(omega) is strikingly similar in the ladders and in the undoped high-T(c) cuprates, which emphasizes the importance of strong quantum fluctuations in the latter." @default.
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• W1626006883 date "2001-08-28" @default.
• W1626006883 modified "2023-10-12" @default.
• W1626006883 title "Observation of Two-Magnon Bound States in the Two-Leg Ladders of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mo>(</mml:mo><mml:mi>C</mml:mi><mml:mi>a</mml:mi><mml:mo>,</mml:mo><mml:mi>L</mml:mi><mml:mi>a</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>14</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>24</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow…" @default.
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• W1626006883 doi "https://doi.org/10.1103/physrevlett.87.127002" @default.
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• W1626006883 hasPublicationYear "2001" @default.
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