title: Neutron diffraction and electrical transport studies on the incommensurate magnetic phase transition in holmium at high pressures.
abstract: Neutron diffraction and electrical transport measurements have been made on the heavy rare earth metal holmium at high pressures and low temperatures in order to elucidate its transition from a paramagnetic (PM) to a helical antiferromagnetic (AFM) ordered phase as a function of pressure. The electrical resistance measurements show a change in the resistance slope as the temperature is lowered through the antiferromagnetic Néel temperature. The temperature of this antiferromagnetic transition decreases from approximately 122 K at ambient pressure at a rate of -4.9 K GPa(-1) up to a pressure of 9 GPa, whereupon the PM-to-AFM transition vanishes for higher pressures. Neutron diffraction measurements as a function of pressure at 89 and 110 K confirm the incommensurate nature of the phase transition associated with the antiferromagnetic ordering of the magnetic moments in a helical arrangement and that the ordering occurs at similar pressures as determined from the resistance results for these temperatures.
authors.affiliation: Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
authors.forename: Sarah A
authors.initials: SA
authors.lastname: Thomas
authors.forename: Walter O
authors.initials: WO
authors.lastname: Uhoya
authors.forename: Georgiy M
authors.initials: GM
authors.lastname: Tsoi
authors.forename: Lowell E
authors.initials: LE
authors.lastname: Wenger
authors.forename: Yogesh K
authors.initials: YK
authors.lastname: Vohra
authors.forename: Gary N
authors.initials: GN
authors.lastname: Chesnut
authors.forename: Samuel T
authors.initials: ST
authors.lastname: Weir
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Tulk
authors.forename: Antonio M
authors.initials: AM
authors.lastname: dos Santos
mesh_terms: D004579:Electron Transport; D006695:Holmium / Q000737:chemistry*; D060526:Magnetic Fields; D008422:Materials Testing; D033363:Neutron Diffraction; D044367:Phase Transition; D011312:Pressure
chemical_list: D006695:Holmium