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Grant support

Encouraging discussions with A.J. Leggett are gratefully acknowledged. This work has been partially supported by the Spanish Ministry of Economy through project FIS2017-84330-R, as well as by the Autonomous Community of Madrid through programme NANOFRONTMAGCM (S2013/MIT-2850).

Analysis of institutional authors

Moratalla, M.AuthorRamos, M ACorresponding Author

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February 25, 2019
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Residual entropy in the zero-temperature limit of toluene glass

Publicated to:LOW TEMPERATURE PHYSICS. 45 (3): 331-336 - 2019-03-01 45(3), DOI: 10.1063/1.5090091

Authors: Moratalla, M; Bejarano, P; Castilla, J M; Ramos, M A

Affiliations

Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, Madrid, Spain - Author
Univ Autonoma Madrid, Dept Fis Mat Condensada, Lab Bajas Temp, Madrid, Spain - Author
Univ Autonoma Madrid, INC, Madrid, Spain - Author

Abstract

The specific heat C-p of toluene, doped with 2 mol% ethanol to avoid rapid crystallization, has been measured in both glass and crystal states, and with special accuracy at low temperatures in the range 1.8-20 K using the thermal relaxation method. By making use of the complementary C-p curves measured in the reference crystal state, we have been able to obtain the entropy curve of the glass and eventually the residual entropy of toluene glass in the zero-temperature limit, that is found to be 5.1 J/(K.mol). This value is clearly lower than others pre-viously reported in the literature, which lack the knowledge of the particular specific-heat behavior of glasses at low temperatures and hence overestimated the glass residual entropy at zero temperature. In addition, we have studied in detail such low-temperature glassy anomalies in the case of toluene, extending and improving pre-vious measurements. The surprising depletion previously reported of tunneling two-level systems in toluene glass has been confirmed, though this fact coexists with the presence of a broad peak typical of glasses (the so-called boson peak) in C-p/T-3 at 4.5 K. For the toluene crystal, the expected cubic Debye behavior has been found at lower temperatures. Published under license by AIP Publishing.

Keywords

Boson peakDynamicsEntropy of glassesGlass transitionHeatModesSpecific heatSupercooled liquidsThermal-conductivityTolueneTunneling states

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal LOW TEMPERATURE PHYSICS, and although the journal is classified in the quartile Q4 (Agencia WoS (JCR)), its regional focus and specialization in Physics, Applied, give it significant recognition in a specific niche of scientific knowledge at an international level.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-07-06:

  • Google Scholar: 5
  • Scopus: 1

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-07-06:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 4.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 4 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 0.5.
  • The number of mentions on the social network X (formerly Twitter): 1 (Altmetric).

Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (MORATALLA MARTÍN, MANUEL EDUARDO) and Last Author (RAMOS RUIZ, MIGUEL ANGEL).

the author responsible for correspondence tasks has been RAMOS RUIZ, MIGUEL ANGEL.