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The temperature dependence of step density on the vicinal Pb(111) surface is investigated using reflection high-energy electron diffraction. When the temperature is increased from 323 to 590 K, the average terrace width and the average string length at the step edge decrease from 85{plus_minus}25 to 37{plus_minus}16 {Angstrom} and from 220{plus_minus}33 to 25{plus_minus}8 {Angstrom}, respectively. Thermal step collapse on the Pb(111) surface near its bulk melting temperature is not observed. Above 530{plus_minus}7 K, the change in the string length at the step edge with temperature becomes small, and the intensity of the (00) beam is significantly decreased. We conclude that partial step melting at the step edge occurs at the surface above 530{plus_minus}7 K. {copyright} {ital 1998} {ital The American Physical Society}

Temperature dependence of step density on vicinal Pb(111)