Low temperature magnetization of the quantum critical heavy fermion superconductor $\beta$-YbAlB${}_4$

Abstract

$\beta$-YbAlB${}_4$ is the first Yb-based heavy fermion superconductor with $T_{\mathrm{c}}=80$ mK. We measured low temperature magnetization of high-purity single crystals down to $T=$ 25 mK. The measurements have revealed a considerable amount of volume fractions of the superconductivity and the upper critical field $B_{c2}$ curve under field along the c axis, consistent with the previous results. In the normal state, the previously observed divergent behavior in the temperature dependence of the magnetization has been confirmed using higher quality samples and under a low field of 22 mT. In addition, the measurements have revealed a power law behavior, namely, $dM/dT\propto T^{3/2}$, which has a slightly higher exponent than the previous results.

3 pages, 4 figures, a proceedings paper of QCNP 2009

References in corpus (4)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Layered Kondo lattice model for quantum critical beta-YbAlB4
• The role of f -electrons in the Fermi surface of the heavy fermion superconductor beta-YbAlB4

Cited by in corpus (4)

• Quantum Valence Criticality as Origin of Unconventional Critical Phenomena
• New Universality Class of Quantum Criticality in Ce- and Yb-based Heavy Fermions
• Field evolution of quantum critical and heavy Fermi-liquid components in the magnetization of the mixed valence compound beta-YbAlB4
• T/B scaling of magnetization in the mixed valent compound β-YbAlB4