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Journal Article

Temperature-field phase diagram of geometrically frustrated CePdAl


Steglich,  Frank
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zhao, H., Zhang, J., Hu, S., Isikawa, Y., Luo, J., Steglich, F., et al. (2016). Temperature-field phase diagram of geometrically frustrated CePdAl. Physical Review B, 94(23): 235131, pp. 1-5. doi:10.1103/PhysRevB.94.235131.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-3EC1-0
A rich temperature-field phase diagram has been constructed for the geometrically frustrated, Ising-like heavy-fermion compound CePdAl. In the limit of zero temperature, the magnetic field applied along the Ising axis (B parallel to c) induces a suppression of the antiferromagnetism, resulting in a sequence of phase transitions/crossovers, rather than a single critical point, in a critical region of field 3-5 T. In the lowest-temperature region, a power-law description of resistivity yields A . T-n with n > 2 for all applied fields up to at least 14 T. A quadratic-in-temperature resistivity term, however, can be extracted when assuming an additional electron-scattering channel from magnonlike excitations, with A tending to be divergent upon approaching the critical regime. Our observations suggest CePdAl to be a new playground for exotic physics arising from the competition between Kondo screening and geometrical frustration.