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- W2093961347 abstract "We report on specific heat and Hall probe magnetization measurements in magnesium diboride single crystals. A magnetic field dependence of the coherence length $(ensuremath{xi})$ has been deduced from the former assuming that the electronic excitations are localized in field dependent vortex cores in which case $ensuremath{xi}$ is related to the Sommerfeld coefficient $ensuremath{gamma}=mathrm{ensuremath{Delta}}{C}_{p}∕T{ensuremath{mid}}_{Tensuremath{rightarrow}0}$ throughout, $ensuremath{gamma}ensuremath{propto}[ensuremath{xi}(H)∕{a}_{0}{]}^{2}$ (${a}_{0}$ being the vortex spacing). The reversible part of the magnetization has been analyzed with a phenomenological Ginzburg-Landau model introducing field dependent parameters (i.e., penetration depth $ensuremath{lambda}$ and $ensuremath{xi}$) which account for the decreasing contribution of the $ensuremath{pi}$-band with increasing field. This approach perfectly reproduces the experimental data by combining the field dependence of $ensuremath{xi}$ deduced from ${C}_{p}$ $(1∕{ensuremath{xi}}^{2}ensuremath{sim}sqrt{B})$ with an almost linear increase of $ensuremath{lambda}$ from $ensuremath{sim}450phantom{rule{0.3em}{0ex}}mathrm{AA{}}$ at low field to $ensuremath{sim}700phantom{rule{0.3em}{0ex}}mathrm{AA{}}$ close to ${H}_{c2}$. These field dependences can then be used to consistently describe the field dependence of the critical current density, small angle neutron scattering form factor, and muon spin relaxation rate." @default.
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- W2093961347 date "2006-05-11" @default.
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- W2093961347 title "Magnetic field dependence of the coherence length and penetration depth of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi>MgB</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>single crystals" @default.
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- W2093961347 doi "https://doi.org/10.1103/physrevb.73.184513" @default.
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