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| paramagnetic materials (2) | paramagnetic-antiferromagnetic transitions (1) | PARAMAGNETISM (1) |
| penetration depth (superconductivity) (2) | permittivity (2) | PEROVSKITES (1) |
| phase diagrams (2) | phonon-impurity interactions (1) | phonons (4) |
| photoconducting devices (1) | photoconducting materials (1) | photoexcitation (1) |
| positive ions (1) | praseodymium compounds (6) | pulsed laser deposition (4) |
