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Pressure versus magnetic-field tuning of a magnetic quantum phase transition

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons126865

Stockert,  O.
Oliver Stockert, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Stockert, O., Huster, F., Neubert, A., Pfleiderer, C., Pietrus, T., Will, B., et al. (2002). Pressure versus magnetic-field tuning of a magnetic quantum phase transition. Physica B, 312, 458-460. doi:10.1016/S0921-4526(01)01142-5.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-319F-4
Abstract
The low temperature properties of CeCu6-xAux show different behavior at the quantum phase transition depending on how the long-range antiferromagnetic order is suppressed. Tuning by hydrostatic pressure p results in a temperature dependence of the specific heat C(T) and the electrical resistivity rho(T) as C/T = a ln(T-0/T) and rho approximate to rho(0) + A'T, while C/T = gamma(0) - a'T-0.5 and rho approximate to rho(0) + A"T- 1.5 when tuned by applying a magnetic field B. The magnetic (p, T) and (B, T) phase diagrams as inferred from specific heat, electrical resistivity and neutron diffraction measurements are distinctly different. These findings suggest that the spectra of the low-lying magnetic fluctuations near these quantum phase transitions differ. (C) 2002 Elsevier Science B.V. All rights reserved.