Collapse of the spin gap with pressure in spin-ladder compounds

Journal Article · Tue Sep 01 04:00:00 EDT 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.58.R5905· OSTI ID:641652

Schmeltzer, D; Bishop, A R ^[1]

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1. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

We introduce a model of weakly coupled spin ladders using a decomposition into triplet and singlet Majorana fermions. We show that a weak coupling between the ladders causes the triplet gap to vanish. Assuming that pressure enhances the interladder coupling, we find that the triplet gap vanishes with increased pressure. We suggest that this is the explanation of recent nuclear magnetic resonance experimental data in superconducting spin-ladder compounds such as Sr{sub 2}Ca{sub 12}Cu{sub 24}O{sub 41}. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 641652
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 58; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ENERGY GAP
FERMIONS
HEISENBERG MODEL
HIGH-TC SUPERCONDUCTORS
NUCLEAR MAGNETIC RESONANCE
SPIN
TRIPLETS