Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1905
Title: Excess specific heat from the gapped sliding phonon modes in the incommensurate composite crystal Sr14Cu24O41
Authors: BAG, RABINDRANATH
Hazra, Soumitra
Kini, Rajeev N.
SINGH, SURJEET
Dept. of Physics
Keywords: Crystal phenomena
Crystal phenomena
Quasiparticles
Thermal properties
TOC-FEB-2019
2019
Issue Date: Feb-2019
Publisher: American Physical Society
Citation: Physical Review B, 99(5).
Abstract: We show that the low-temperature specific heat ( C p ) of the incommensurate chain-ladder system { CuO 2 } α { Sr 2 Cu 2 O 3 } = Sr 14 Cu 24 O 41 (for α = 10 / 7 ) shows a rather large excess contribution of nonmagnetic origin. Diluted Al doping at the Cu site or annealing the crystal in an O 2 atmosphere suppresses this feature considerably. Using THz time-domain spectroscopy, we relate the occurrence of excess specific heat to the presence of very low-energy ( ∼ 1 meV ) gapped phonon modes that originate from the sliding motion of oppositely charged { CuO 2 } chain and { Sr 2 Cu 2 O 3 } ladder sheets past each other.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1905
https://doi.org/10.1103/PhysRevB.99.054305
ISSN: 2469-9950
2469-9969
Appears in Collections:JOURNAL ARTICLES

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