Phys. Rev. Lett. 83, 3017–3020 (1999)Temperature-Dependent Exchange Splitting of a Surface State on a Local-Moment Magnet: Tb(0001)Received 26 May 1999; published in the issue dated 11 October 1999 We have investigated the temperature-dependent binding energies of the exchange-split Tb(0001) surface state by means of scanning tunneling spectroscopy. At T = 16K the majority and minority part of the surface state exhibit a binding energy of -135±8meV and +430±15meV, respectively. Both peak positions shift with increasing temperature and continuously decrease the exchange splitting down to 200 meV at 260 K, i.e., 30 K above the bulk Néel temperature TNB. This result is explained in terms of a decrease of helical short-range spin order with increasing temperature above TNB. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.3017
DOI:
10.1103/PhysRevLett.83.3017
PACS:
73.20.At, 75.30.Pd, 75.70.Ak
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