Relationship between superconductivity and crystal structure in NbB 2+x

H. Takagiwa; E. Nishibori; N. Okada; M. Takata; M. Sakata; J. Akimitsu

doi:10.1016/j.stam.2005.11.015

Relationship between superconductivity and crystal structure in NbB _2+x

H. Takagiwa, E. Nishibori, N. Okada, M. Takata, M. Sakata, J. Akimitsu

SRIS - SR Core Research Division

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12 Citations (Scopus)

Abstract

We have performed magnetic susceptibility measurements and precise crystal structure analysis of the nonstoichiometric NbB_2+x superconductor to reveal the relationship between T_c and crystal structure. From magnetic susceptibility measurements, it was found that T_c increases from 2.2 to 5.8 K with x. The crystal structures including both chemical compositions and lattice constants were precisely determined by Rietveld refinement using synchrotron X-ray powder diffraction data with three different wavelengths. We found that interatomic Nb-B distance increases with T _c. The charge density of NbB_2+x was revealed by the maximum entropy method based on Rietveld refinement. We find the difference in the number of electrons in the Nb site and B layer for NbB_2+xwith different compositions and T_c.

Original language	English
Pages (from-to)	22-25
Number of pages	4
Journal	Science and Technology of Advanced Materials
Volume	7
Issue number	1 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.stam.2005.11.015
Publication status	Published - 2006 Jan

Keywords

Maximum Entropy Method (MEM)
NbB
Superconductivity

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title = "Relationship between superconductivity and crystal structure in NbB 2+x ",

abstract = "We have performed magnetic susceptibility measurements and precise crystal structure analysis of the nonstoichiometric NbB2+x superconductor to reveal the relationship between Tc and crystal structure. From magnetic susceptibility measurements, it was found that Tc increases from 2.2 to 5.8 K with x. The crystal structures including both chemical compositions and lattice constants were precisely determined by Rietveld refinement using synchrotron X-ray powder diffraction data with three different wavelengths. We found that interatomic Nb-B distance increases with T c. The charge density of NbB2+x was revealed by the maximum entropy method based on Rietveld refinement. We find the difference in the number of electrons in the Nb site and B layer for NbB2+xwith different compositions and Tc.",

keywords = "Maximum Entropy Method (MEM), NbB, Superconductivity",

author = "H. Takagiwa and E. Nishibori and N. Okada and M. Takata and M. Sakata and J. Akimitsu",

note = "Funding Information: This work was partially supported by a Grant-in-Aid for the 21st COE Program from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government. The synchrotron radiation experiments were performed at Spring-8 BL02B2 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI).",

year = "2006",

month = jan,

doi = "10.1016/j.stam.2005.11.015",

language = "English",

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journal = "Science and Technology of Advanced Materials",

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T1 - Relationship between superconductivity and crystal structure in NbB 2+x

AU - Takagiwa, H.

AU - Nishibori, E.

AU - Okada, N.

AU - Takata, M.

AU - Sakata, M.

AU - Akimitsu, J.

N1 - Funding Information: This work was partially supported by a Grant-in-Aid for the 21st COE Program from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government. The synchrotron radiation experiments were performed at Spring-8 BL02B2 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI).

PY - 2006/1

Y1 - 2006/1

N2 - We have performed magnetic susceptibility measurements and precise crystal structure analysis of the nonstoichiometric NbB2+x superconductor to reveal the relationship between Tc and crystal structure. From magnetic susceptibility measurements, it was found that Tc increases from 2.2 to 5.8 K with x. The crystal structures including both chemical compositions and lattice constants were precisely determined by Rietveld refinement using synchrotron X-ray powder diffraction data with three different wavelengths. We found that interatomic Nb-B distance increases with T c. The charge density of NbB2+x was revealed by the maximum entropy method based on Rietveld refinement. We find the difference in the number of electrons in the Nb site and B layer for NbB2+xwith different compositions and Tc.

AB - We have performed magnetic susceptibility measurements and precise crystal structure analysis of the nonstoichiometric NbB2+x superconductor to reveal the relationship between Tc and crystal structure. From magnetic susceptibility measurements, it was found that Tc increases from 2.2 to 5.8 K with x. The crystal structures including both chemical compositions and lattice constants were precisely determined by Rietveld refinement using synchrotron X-ray powder diffraction data with three different wavelengths. We found that interatomic Nb-B distance increases with T c. The charge density of NbB2+x was revealed by the maximum entropy method based on Rietveld refinement. We find the difference in the number of electrons in the Nb site and B layer for NbB2+xwith different compositions and Tc.

KW - Maximum Entropy Method (MEM)

KW - NbB

KW - Superconductivity

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JO - Science and Technology of Advanced Materials

JF - Science and Technology of Advanced Materials

IS - 1 SPEC. ISS.

ER -

Relationship between superconductivity and crystal structure in NbB _2+x

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Keywords

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