title: Spear-anvil point-contact spectroscopy in pulsed magnetic fields.
abstract: We describe a new design and experimental technique for point-contact spectroscopy in non-destructive pulsed magnetic fields up to 70 T. Point-contact spectroscopy uses a quasi-dc four-point measurement of the current and voltage across a spear-anvil point-contact. The contact resistance could be adjusted over three orders of magnitude by a built-in fine pitch threaded screw. The first measurements using this set-up were performed on both single-crystalline and exfoliated graphite samples in a 150 ms, pulse length 70 T coil at 4.2 K and reproduced the well known point-contact spectrum of graphite and showed evidence for a developing high field excitation above 35 T, the onset field of the charge-density wave instability in graphite.
authors.affiliation: Royal Holloway, University of London, Egham TW20 0EX, United Kingdom.
authors.forename: F
authors.initials: F
authors.lastname: Arnold
authors.forename: B
authors.initials: B
authors.lastname: Yager
authors.forename: E
authors.initials: E
authors.lastname: Kampert
authors.forename: C
authors.initials: C
authors.lastname: Putzke
authors.forename: J
authors.initials: J
authors.lastname: Nyéki
authors.forename: J
authors.initials: J
authors.lastname: Saunders