期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.167001
关键词
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资金
- Department of Energy, Basic Energy Sciences [DE-FG02-10ER46783]
- Notre Dame Glynn family honors program
- College of Science
- ND REU (National Science Foundation) [PHY05-52843]
- Notre Dame Institute for Scholarship in the Liberal Arts
- National Center of Competence in Research MaNEP (Materials with Novel Electronic Properties)
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- National Institute of Standards and Technology, U.S. Department of Commerce
- National Science Foundation [DMR-0944772]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1062819] Funding Source: National Science Foundation
The vortex lattice (VL) symmetry and orientation in clean type-II superconductors depends sensitively on the host material anisotropy, vortex density and temperature, frequently leading to rich phase diagrams. Typically, a well-ordered VL is taken to imply a ground-state configuration for the vortex-vortex interaction. Using neutron scattering we studied the VL in MgB2 for a number of field-temperature histories, discovering an unprecedented degree of metastability in connection with a known, second-order rotation transition. This allows, for the first time, structural studies of a well-ordered, nonequilibrium VL. While the mechanism responsible for the longevity of the metastable states is not resolved, we speculate it is due to a jamming of VL domains, preventing a rotation to the ground-state orientation.
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