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  Structural modulation and low-frequency excitations in the incommensurate phases of biphenyl

von Laue, L., Ermark, F., Gölzhäuser, A., Haeberlen, U., & Häcker, U. (1996). Structural modulation and low-frequency excitations in the incommensurate phases of biphenyl. Journal of Physics: Condensed Matter, 8(22), 3977-3992. doi:10.1088/0953-8984/8/22/003.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-349B-A Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-349C-8
Genre: Journal Article
Alternative Title : Structural modulation and low-frequency excitations in the incommensurate phases of biphenyl

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JPhysCondensMatter_8_1996_3977.pdf (Any fulltext), 167KB
 
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http://www.iop.org/EJ/article/0953-8984/8/22/003/c62202.pdf (Any fulltext)
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 Creators:
von Laue, L., Author
Ermark, F., Author
Gölzhäuser, A., Author
Haeberlen, Ulrich1, Author           
Häcker, U., Author
Affiliations:
1Research Group Prof. Dr. Haeberlen, Max Planck Institute for Medical Research, Max Planck Society, ou_1497739              

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 Abstract: The incommensurate phases IC II and IC III of biphenyl are investigated by means of NMR. It is shown that the structural modulation appears along one direction, and can be described by a periodic twisting of the phenyl rings about the molecular axis. The temperature dependence of the maximum twist angle below the N − IC phase transition follows a power law with a critical exponent . A two−dimensional NMR exchange spectrum in the IC II phase of biphenyl is recorded. It clearly excludes a `floating' of the modulation wave. The temperature and Larmor frequency dependences of the NMR spin − lattice relaxation rates in the IC phases of biphenyl are measured. A distinct dependence of on the Larmor frequency is found and analysed on the basis of a relaxatory dynamics of the order parameter (OP). A reliable estimate of about 5 MHz for the characteristic frequencies of the OP dynamics is derived. In the IC III phase, the spectra as well as the spin − lattice relaxation rates indicate that the structure of biphenyl is not a truly incommensurate one

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Language(s): eng - English
 Dates: 1996-01-041996-05-27
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 665245
DOI: 10.1088/0953-8984/8/22/003
URI: http://www.iop.org/EJ/abstract/0953-8984/8/22/003
URI: http://www.iop.org/EJ/article/0953-8984/8/22/003/c62202.pdf
Other: 6819
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Title: Journal of Physics: Condensed Matter
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 8 (22) Sequence Number: - Start / End Page: 3977 - 3992 Identifier: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478