| Spin wave collapse and incommensurate fluctuations in URu2Si2 (1994) | |||||||
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| ELSEVIER Physica Spin wave collapse and incommensurate fluctuations URu Buyers Tun Petersen Mason Lussieff Gaulin Menovsky aAECL Research Chalk Rirer Ont KOJ Canada bRiso National Laboratory Denmark CMcMaster Unirersity Hamilton Ont LSS Canada aUnirersity Amsterdam terdam The Netherhmds Abstract test the transition URu driven divergence magnetic order parameter performed high resolution neutron scattering the ordering wave vector the spin wave energy collapsed and the susceptibility diverged was approached This confirms that the order parameter the magnetic dipole shown recent symmetry arguments and polarized neutron experiments also observe incommensurate fluctuations suggesting that competing temperature dependent interactions may influence this weakmoment transition Speculation exists that the ordered phase that precedes superconductivity the heavy fermion systems URu and UPt I might not magnetic The low apparent moments n respectively have led suggestions that the brokensymmetry Bragg peaks are quadrupolar more exotic non trivial phase test these ideas have made not only elastic neutron scattering study but also present here detailed study the critical dynamics which provide separate indicator the nature the transition For non magnetic order there requitement for the magnetic susceptibility diverge nor there need soft spin wave mode therefore studied the spin response the ordering wave vector to observe the temperature dependence the gap energy its damping and the suscept | |||||||
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