EPR Study of Monoclinic RbD2PO4 Monocrystal Doped with Cr5+ Ion |
| S. Waplak Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland and L.A. Shuvalov Institute of Crystallography, Academy of Sciences, Moscow, Russia |
| Received: July 19, 1994; revised version: September 13, 1994; in final form: November 3, 1994 |
| Full Text PDF |
| Deuterated monoclinic RbD2PO4 (DRDP) doped with chromium Cr5+ is studied by EPR in 90 K to 400 K temperature range. EPR reveals two types of paramagnetic centers: single Cr5+ (S = 1/2) complex and Cr5+-Cr5+ coupled pairs with effective spin S = 1. The EPR line splitting of single Cr5+ complex in DRDP versus temperature agrees with the unit cell multiplication. The splitting of EPR line of pair spectrum appears at T* = 160 K, far below the phase transition temperatures and is due to the anisotropy of the exchange interaction. The clustering effect in the low-dimensional DRDP is suggested. |
| DOI: 10.12693/APhysPolA.87.643 PACS numbers: 76.30.-v, 64.60.-i |