Anomalous Itinerant-Electron Metamagnetic Transition in the Layered Sr1-xCaxCo2P2 System

Abstract

We report magnetic properties of the layered itinerant system, Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$ in the magnetic field up to 70 T. As for the exchange-enhanced Pauli paramagnetic metal SrCo${}_2$P${}_2$, the magnetization curve shows two characteristic anomalies. The low-field anomaly is small without obvious hysteresis, and the high-field one is a typical behavior of the itinerant-electron metamagnetic transition (IEMT). Such a successive transition in the magnetization curve cannot be explained by the conventional phenomenological theory for IEMT due to the Landau expansion of the free energy, but by the extended Landau expansion theory with distinguishable two energy states. In the systematical study of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$, furthermore, the metamagnetic transition field decreases and goes to zero as $x$ increases up to 0.5, indicating that the ferromagnetic quantum critical point (QCP) exists at $x\sim 0.5$.

10 pages, 4 figure, one column

References in corpus (4)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Nematic and meta-nematic transitions in the iron pnictides
• Lattice collapse and the magnetic phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$
• Interplay between quantum criticality and geometrical frustration in Fe3Mo3N with stella quadrangula lattice

Cited by in corpus (6)

• Insulator-metal-superconductor transition in medium-entropy van der Waals compound MEPSe3 (ME=Fe, Mn, Cd, and In) under high pressures
• Competing magnetic phases and itinerant magnetic frustration in SrCo${}_2$As${}_2$
• Co-existence of short- and long-range magnetic order in LaCo${}_2$P${}_2$
• Magnetic properties of the itinerant A-type antiferromagnet CaCo2P2 studied by 59Co and 31P NMR
• Pressure driven magnetic order in Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$
• Magnetic phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$