Abstract
Substantial hole doping has been achieved in (La, Sr, Ca)14Cu24O41 compounds with CuO2 chain and Cu2O3 ladder building blocks. Holes enter the structural units with larger O/Cu ratios which are the CuO2 chains. The ladders remain undoped and magnetically inert due to a large spin gap. The moments in the undoped chains interact weakly, and every hole added creates a nonmagnetic CuO2 unit and decreases the resistivity. At the maximum hole concentration [Formula presented] the residual moments form a singlet ground state possibly due to dimerization with an excitation gap of 140 K to the triplet state.
Original language | English (US) |
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Pages (from-to) | 1378-1381 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 77 |
Issue number | 7 |
DOIs | |
State | Published - 1996 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy