Thermal properties of SmFeAsO1-xFx as a probe of the interplay between electrons and phonons

Tropeano  M; Martinelli  A; Palenzona  ABellingeri  EdAgliano  EGNguyen  TDAffronte  MPutti  M

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Thermal properties of SmFeAsO1-xFx as a probe of the interplay between electrons and phonons

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A comparative study of thermal properties of SmFeAsO, SmFeAs(O0.93F0.07), and SmFeAs(O0.85F0.15) samples is presented. Specific heat and thermal conductivity show clear evidence of the spin-density wave (SDW) ordering below T-SDW similar to 135 K in undoped SmFeAsO. At low level of F doping, SmFeAs(O0.93F0.07), SDW ordering is suppressed and superconducting features are not yet optimally developed in both specific heat and thermal conductivity. At optimal level of F-doping SmFeAs(O0.85F0.15) anomalies related to the superconducting transition are well noticeable. By a compared analysis of doped and undoped samples we conclude that despite the fact that F doping modifies definitely the electronic ground state, it does not substantially alter phonon and electron parameters, such as phonon modes, Sommerfeld coefficient, and electro-phonon coupling. The analysis of the thermal conductivity curves provides an evaluation of the SDW and superconducting energy gap, showing that phonons can suitably probe features of the electronic ground state.

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《Physical review, B. Condensed matter and materials physics》 |2008年第9期|094518-1-094518-7-0|共7页
作者
Tropeano M; Martinelli A; Palenzona ABellingeri EdAgliano EGNguyen TDAffronte MPutti M;
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作者单位

CNR INFM LAMIA, Dipartimento Fis, I-16146 Genoa, Italy;

CNR INFM LAMIA, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy;

Univ Modena & Reggio Emilia, Dipartimento Fis, CNR INFM S3, I-41100 Modena, Italy;

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正文语种英语
中图分类固体物理学;
关键词
HIGH-TC SUPERCONDUCTORS; CONDUCTIVITY; WAVE;

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Thermal properties of SmFeAsO1-xFx as a probe of the interplay between electrons and phonons

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