Unconventional Quantum Criticality in β-YbAlB4 Detached from Its Magnetically Ordered Phase

Takahiro Tomita, Kentaro Kuga, Yoshiya Uwatoko, Piers Coleman, Satoru Nakatsuji

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

We studied the effect of pressure on the Yb-based heavy-fermion superconductor β-YbAlB4 (Tc=80 mK) near its quantum critical point (QCP) at ambient pressure. Here, the electrical resistivity ρ(T) of the high-quality single crystal (RRR = 300) is measured under hydrostatic pressure P ≃ 2.7 GPa at low temperatures down to 70 mK. The superconducting transition Tc gradually decreases with the application of pressure and disappears near 0.9 GPa. However, the non-Fermi liquid (NFL) behavior is found to be robust over a broad range of pressure 0 ≤ P ≤ 0.5 GPa. The NFL state above Tc gradually changes to the Fermi liquid state with the application of pressure above P ≃ 0.5 GPa. The magnetic order transition is first observed at 50 mK and Pc = 2.7 GPa. The P -T phase diagram indicates that the QCP lying beneath the superconductivity dome is detached from the magnetically ordered phase.

Original languageEnglish (US)
Pages (from-to)482-487
Number of pages6
JournalPhysics Procedia
Volume75
DOIs
StatePublished - 2015
Event20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain
Duration: Jul 5 2015Jul 10 2015

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

Keywords

  • Yb-based heavy fermion
  • quantum criticality
  • unconventional superconductivity
  • valence fluctuations

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