Micro-transitions or breathers in L-alanine?

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

Micro-transitions or breathers in L-alanine? / Barthes, M.; Bordallo, H. N.; Dénoyer, F.; Lorenzo, J. E.; Zaccaro, J.; Robert, A.; Zontone, F.

In: European Physical Journal B, Vol. 37, No. 3, 01.02.2004, p. 375-382.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Barthes, M, Bordallo, HN, Dénoyer, F, Lorenzo, JE, Zaccaro, J, Robert, A & Zontone, F 2004, 'Micro-transitions or breathers in L-alanine?', European Physical Journal B, vol. 37, no. 3, pp. 375-382. https://doi.org/10.1140/epjb/e2004-00069-1

APA

Barthes, M., Bordallo, H. N., Dénoyer, F., Lorenzo, J. E., Zaccaro, J., Robert, A., & Zontone, F. (2004). Micro-transitions or breathers in L-alanine? European Physical Journal B, 37(3), 375-382. https://doi.org/10.1140/epjb/e2004-00069-1

Vancouver

Barthes M, Bordallo HN, Dénoyer F, Lorenzo JE, Zaccaro J, Robert A et al. Micro-transitions or breathers in L-alanine? European Physical Journal B. 2004 Feb 1;37(3):375-382. https://doi.org/10.1140/epjb/e2004-00069-1

Author

Barthes, M. ; Bordallo, H. N. ; Dénoyer, F. ; Lorenzo, J. E. ; Zaccaro, J. ; Robert, A. ; Zontone, F. / Micro-transitions or breathers in L-alanine?. In: European Physical Journal B. 2004 ; Vol. 37, No. 3. pp. 375-382.

Bibtex

@article{b755cdb2ecdd459fa24f27d7ff6b4359,
title = "Micro-transitions or breathers in L-alanine?",
abstract = "The lattice dynamics of crystalline L-alanine shows unusual features tentatively assigned to a localization of vibrational energy. However, other properties alternatively suggest the existence of a second order phase transition undetected in previous crystallographic work. In this paper, we present the results of a high resolution X-ray diffraction study down to 10 K, together with new structure determinations at intermediate temperatures. The data rule out the hypothesis of a conventional structural phase transition. No change in the space group symmetry is observed and an anomalous decrease of the lattice parameter c in discrete steps is discovered when heating the crystal from 10 K to room temperature. It could be ascribed to a progressive conformational change of the NH3 + group of the zwitterionic molecule. An analysis of the physical properties of crystalline L-alanine suggests the existence of a strong dynamic Jahn-Teller-like effect owing to the NH3 + charge-lattice coupling. This would explain both the splitting of some vibrational states and properties related to a microscopic lattice instability like the onset of depolarization in the transmitted light below ∼250 K.",
author = "M. Barthes and Bordallo, {H. N.} and F. D{\'e}noyer and Lorenzo, {J. E.} and J. Zaccaro and A. Robert and F. Zontone",
year = "2004",
month = feb,
day = "1",
doi = "10.1140/epjb/e2004-00069-1",
language = "English",
volume = "37",
pages = "375--382",
journal = "European Physical Journal B. Condensed Matter and Complex Systems",
issn = "1434-6028",
publisher = "Springer",
number = "3",

}

RIS

TY - JOUR

T1 - Micro-transitions or breathers in L-alanine?

AU - Barthes, M.

AU - Bordallo, H. N.

AU - Dénoyer, F.

AU - Lorenzo, J. E.

AU - Zaccaro, J.

AU - Robert, A.

AU - Zontone, F.

PY - 2004/2/1

Y1 - 2004/2/1

N2 - The lattice dynamics of crystalline L-alanine shows unusual features tentatively assigned to a localization of vibrational energy. However, other properties alternatively suggest the existence of a second order phase transition undetected in previous crystallographic work. In this paper, we present the results of a high resolution X-ray diffraction study down to 10 K, together with new structure determinations at intermediate temperatures. The data rule out the hypothesis of a conventional structural phase transition. No change in the space group symmetry is observed and an anomalous decrease of the lattice parameter c in discrete steps is discovered when heating the crystal from 10 K to room temperature. It could be ascribed to a progressive conformational change of the NH3 + group of the zwitterionic molecule. An analysis of the physical properties of crystalline L-alanine suggests the existence of a strong dynamic Jahn-Teller-like effect owing to the NH3 + charge-lattice coupling. This would explain both the splitting of some vibrational states and properties related to a microscopic lattice instability like the onset of depolarization in the transmitted light below ∼250 K.

AB - The lattice dynamics of crystalline L-alanine shows unusual features tentatively assigned to a localization of vibrational energy. However, other properties alternatively suggest the existence of a second order phase transition undetected in previous crystallographic work. In this paper, we present the results of a high resolution X-ray diffraction study down to 10 K, together with new structure determinations at intermediate temperatures. The data rule out the hypothesis of a conventional structural phase transition. No change in the space group symmetry is observed and an anomalous decrease of the lattice parameter c in discrete steps is discovered when heating the crystal from 10 K to room temperature. It could be ascribed to a progressive conformational change of the NH3 + group of the zwitterionic molecule. An analysis of the physical properties of crystalline L-alanine suggests the existence of a strong dynamic Jahn-Teller-like effect owing to the NH3 + charge-lattice coupling. This would explain both the splitting of some vibrational states and properties related to a microscopic lattice instability like the onset of depolarization in the transmitted light below ∼250 K.

UR - http://www.scopus.com/inward/record.url?scp=2542445179&partnerID=8YFLogxK

U2 - 10.1140/epjb/e2004-00069-1

DO - 10.1140/epjb/e2004-00069-1

M3 - Journal article

AN - SCOPUS:2542445179

VL - 37

SP - 375

EP - 382

JO - European Physical Journal B. Condensed Matter and Complex Systems

JF - European Physical Journal B. Condensed Matter and Complex Systems

SN - 1434-6028

IS - 3

ER -

ID: 210117788