Phase inhomogeneities and lattice expansion near Tc in the Mg11B2 superconductor

S. Margadonna; T. Muranaka; K. Prassides; I. Maurin; K. Brigatti; R. M. Ibberson; M. Arai; M. Takata; J. Akimitsu

doi:10.1088/0953-8984/13/35/101

Phase inhomogeneities and lattice expansion near T_c in the Mg¹¹B₂ superconductor

S. Margadonna, T. Muranaka, K. Prassides, I. Maurin, K. Brigatti, R. M. Ibberson, M. Arai, M. Takata, J. Akimitsu

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Abstract

High-resolution powder neutron diffraction has been used to study the crystal structure of the Mg¹¹B₂ superconductor (T_c = 39.2 K) prepared at high pressure in the temperature range 2 to 293 K. The experimental data provide clear evidence of temperature-independent phase inhomogeneity, which was modelled by coexisting Mg_1+δB₂ phases. Precise structural information for temperatures near T_c also reveals extremely small volume and c-axis discontinuities, consistent with the existence of a specific heat anomaly at T_c.

Original language	English
Pages (from-to)	L795-L802
Journal	Journal of Physics Condensed Matter
Volume	13
Issue number	35
DOIs	https://doi.org/10.1088/0953-8984/13/35/101
State	Published - Sep 3 2001
Externally published	Yes

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title = "Phase inhomogeneities and lattice expansion near Tc in the Mg11B2 superconductor",

abstract = "High-resolution powder neutron diffraction has been used to study the crystal structure of the Mg11B2 superconductor (Tc = 39.2 K) prepared at high pressure in the temperature range 2 to 293 K. The experimental data provide clear evidence of temperature-independent phase inhomogeneity, which was modelled by coexisting Mg1+δB2 phases. Precise structural information for temperatures near Tc also reveals extremely small volume and c-axis discontinuities, consistent with the existence of a specific heat anomaly at Tc.",

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T1 - Phase inhomogeneities and lattice expansion near Tc in the Mg11B2 superconductor

AU - Margadonna, S.

AU - Muranaka, T.

AU - Prassides, K.

AU - Maurin, I.

AU - Brigatti, K.

AU - Ibberson, R. M.

AU - Arai, M.

AU - Takata, M.

AU - Akimitsu, J.

PY - 2001/9/3

Y1 - 2001/9/3

N2 - High-resolution powder neutron diffraction has been used to study the crystal structure of the Mg11B2 superconductor (Tc = 39.2 K) prepared at high pressure in the temperature range 2 to 293 K. The experimental data provide clear evidence of temperature-independent phase inhomogeneity, which was modelled by coexisting Mg1+δB2 phases. Precise structural information for temperatures near Tc also reveals extremely small volume and c-axis discontinuities, consistent with the existence of a specific heat anomaly at Tc.

AB - High-resolution powder neutron diffraction has been used to study the crystal structure of the Mg11B2 superconductor (Tc = 39.2 K) prepared at high pressure in the temperature range 2 to 293 K. The experimental data provide clear evidence of temperature-independent phase inhomogeneity, which was modelled by coexisting Mg1+δB2 phases. Precise structural information for temperatures near Tc also reveals extremely small volume and c-axis discontinuities, consistent with the existence of a specific heat anomaly at Tc.

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U2 - 10.1088/0953-8984/13/35/101

DO - 10.1088/0953-8984/13/35/101

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SP - L795-L802

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

IS - 35

ER -

Phase inhomogeneities and lattice expansion near T_c in the Mg¹¹B₂ superconductor

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