Excess speicific heat of the gapped sliding phonons in the incommensurate composite crystal Sr$_{14}$Cu$_{24}$O$_{41}$

We show that low temperature specific heat (C $_{p}$ ) of the incommensurate chain-ladder system Sr $_{14}$ Cu $_{24}$ O $_{41}$ is enriched by the presence of a rather large excess contribution of non-magnetic origin. Diluted Al doping at the Cu site or annealing the crystal in an O $_{2}$ atmosphere suppresses this feature considerably. Using the THz time-domain spectroscopy, we show that the occurrence of excess specific heat is associated with the presence of very low-energy ( $\sim$ 1 meV) gapped phonon modes that originate due to the sliding motion of oppositely charged mutually incommensurate chain and ladder layers.

Excess speicific heat of the gapped sliding phonons in the incommensurate composite crystal Sr $_{14}$ Cu $_{24}$ O $_{41}$

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Excess speicific heat of the gapped sliding phonons in the incommensurate composite crystal Sr $_{14}$ Cu $_{24}$ O $_{41}$

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Excess speicific heat of the gapped sliding phonons in the incommensurate composite crystal Sr1414​Cu2424​O4141​

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Excess speicific heat of the gapped sliding phonons in the incommensurate composite crystal Sr1414​Cu2424​O4141​

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Excess speicific heat of the gapped sliding phonons in the incommensurate composite crystal Sr $_{14}$ Cu $_{24}$ O $_{41}$

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Excess speicific heat of the gapped sliding phonons in the incommensurate composite crystal Sr $_{14}$ Cu $_{24}$ O $_{41}$

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AI智能校验