Observation of two critical points linked to the high-field phase B in CeCu2Si2
Observation of two critical points linked to the high-field phase B in CeCu2Si2
We present thermal expansion and magnetostriction measurements on a ${\mathrm{CeCu}}_{2}{\mathrm{Si}}_{2}$ single crystal of A/S type up to 17.9 T magnetic field applied along the crystallographic $a$ direction $(\mathrm{\ensuremath{\Delta}}L\ensuremath{\parallel}a\ensuremath{\parallel}H)$ and down to 0.015 K temperature. We identify clear thermodynamic anomalies at the superconducting transition ${T}_{c}$ and at two second-order transitions ${T}_{A,B}$ …