Anomalous field dependence of the Sommerfeld coefficient in the isotropic (K,Ba)BiO3 superconductor

T. Klein; C. Marcenat; F. Bouquet; A. Junod; S. Blanchard; J. Marcus

doi:10.1016/j.physc.2004.03.057

Anomalous field dependence of the Sommerfeld coefficient in the isotropic (K,Ba)BiO₃ superconductor

T. Klein
, C. Marcenat
, F. Bouquet
, A. Junod
, S. Blanchard
, J. Marcus

École Polytechnique

SPSMS
University of Geneva
Centre national de la recherche scientifique

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

2 Citations (Scopus)

Abstract

We report on specific heat measurements in high quality (K,Ba)BiO ₃ single crystals (T_c∼31.5 K). A well defined specific heat jump is clearly visible at T_Cp(H) in the entire investigated field range (up to 13 T). However, the corresponding T_Cp(H) exhibits an anomalous positive curvature and the amplitude of the jump rapidly decreases with field suggesting a non-linear increase of the Sommerfeld coefficient (γ(H)). This anomalous behaviour is confirmed by low temperature measurements which show that γ(H)∝H^α with α∼0.65.

Original language	English
Pages (from-to)	731-732
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	408-410
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physc.2004.03.057
Publication status	Published - 1 Aug 2004
Event	Proceedings of the International Conference on Materials - Rio de Janeiro, Brazil Duration: 25 May 2003 → 30 May 2003

Keywords

Phase diagram
Specific heat measurements

Access to Document

10.1016/j.physc.2004.03.057

Cite this

@article{363a7cd8a4d54333b0f3c3701b8f6c84,

title = "Anomalous field dependence of the Sommerfeld coefficient in the isotropic (K,Ba)BiO3 superconductor",

abstract = "We report on specific heat measurements in high quality (K,Ba)BiO 3 single crystals (Tc∼31.5 K). A well defined specific heat jump is clearly visible at TCp(H) in the entire investigated field range (up to 13 T). However, the corresponding TCp(H) exhibits an anomalous positive curvature and the amplitude of the jump rapidly decreases with field suggesting a non-linear increase of the Sommerfeld coefficient (γ(H)). This anomalous behaviour is confirmed by low temperature measurements which show that γ(H)∝Hα with α∼0.65.",

keywords = "Phase diagram, Specific heat measurements",

author = "T. Klein and C. Marcenat and F. Bouquet and A. Junod and S. Blanchard and J. Marcus",

year = "2004",

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day = "1",

doi = "10.1016/j.physc.2004.03.057",

language = "English",

volume = "408-410",

pages = "731--732",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

number = "1-4",

note = "Proceedings of the International Conference on Materials ; Conference date: 25-05-2003 Through 30-05-2003",

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TY - JOUR

T1 - Anomalous field dependence of the Sommerfeld coefficient in the isotropic (K,Ba)BiO3 superconductor

AU - Klein, T.

AU - Marcenat, C.

AU - Bouquet, F.

AU - Junod, A.

AU - Blanchard, S.

AU - Marcus, J.

PY - 2004/8/1

Y1 - 2004/8/1

N2 - We report on specific heat measurements in high quality (K,Ba)BiO 3 single crystals (Tc∼31.5 K). A well defined specific heat jump is clearly visible at TCp(H) in the entire investigated field range (up to 13 T). However, the corresponding TCp(H) exhibits an anomalous positive curvature and the amplitude of the jump rapidly decreases with field suggesting a non-linear increase of the Sommerfeld coefficient (γ(H)). This anomalous behaviour is confirmed by low temperature measurements which show that γ(H)∝Hα with α∼0.65.

AB - We report on specific heat measurements in high quality (K,Ba)BiO 3 single crystals (Tc∼31.5 K). A well defined specific heat jump is clearly visible at TCp(H) in the entire investigated field range (up to 13 T). However, the corresponding TCp(H) exhibits an anomalous positive curvature and the amplitude of the jump rapidly decreases with field suggesting a non-linear increase of the Sommerfeld coefficient (γ(H)). This anomalous behaviour is confirmed by low temperature measurements which show that γ(H)∝Hα with α∼0.65.

KW - Phase diagram

KW - Specific heat measurements

U2 - 10.1016/j.physc.2004.03.057

DO - 10.1016/j.physc.2004.03.057

M3 - Conference article

AN - SCOPUS:4344657701

SN - 0921-4534

VL - 408-410

SP - 731

EP - 732

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-4

T2 - Proceedings of the International Conference on Materials

Y2 - 25 May 2003 through 30 May 2003