Nax CoO2: Enhanced low-energy excitations of electrons on a 2d triangular latticeстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Brühwiler M. ,
Batlogg B. ,
Kazakov S.M. ,
Niedermayer Ch ,
Karpinski J.
Журнал:
Physica B: Condensed Matter
Том:
378
Номер:
SPEC. ISS.
Год издания:
2006
Издательство:
Elsevier BV
Местоположение издательства:
Netherlands
Первая страница:
630
Последняя страница:
631
DOI:
10.1016/j.physb.2006.01.422
Аннотация:
To elucidate the low-energy excitation spectrum of correlated electrons on a 2D triangular lattice, we have studied the electrical resistance and specific heat down to 0.5 K and in magnetic fields up to 14 T, in Nax CoO2 samples with a Na content ranging from x ≈ 0.5 to 0.82. Two distinct regimes are observed: for x from about 0.64 to x ≈ 0.75 the specific heat is strongly enhanced, with a pronounced upturn of Cp / T below about 10 K, reaching 47 mJ / ( mol K2 ). This enhancement is suppressed in a magnetic field indicative of strong low-energy spin fluctuations. At higher Na content, the fluctuations are reduced and μSR data confirm the SDW ground state below 22 K and the much reduced heat capacity is field independent. © 2006 Elsevier B.V. All rights reserved.
Добавил в систему:
Казаков Сергей Михайлович