arXiv Open Access 2000

Quantum Impurity in a Nearly Critical Two Dimensional Antiferromagnet

Subir Sachdev Chiranjeeb Buragohain Matthias Vojta

Lihat Sumber

Abstrak

We describe the spin dynamics of an arbitrary localized impurity in an insulating two dimensional antiferromagnet, across the host transition from a paramagnet with a spin gap to a Neel state. The impurity spin susceptibility has a Curie-like divergence at the quantum-critical coupling, but with a universal, effective spin which is neither an integer nor a half-odd-integer. In the Neel state, the transverse impurity susceptibility is a universal number divided by the host spin stiffness (which determines the energy cost to slow twists in the orientation of the Neel order). These, and numerous other results for the thermodynamics, Knight shift, and magnon damping have significant applications to experiments on layered transition metal oxides.

Topik & Kata Kunci

cond-mat.str-el cond-mat.supr-con

Penulis (3)

Subir Sachdev

Chiranjeeb Buragohain

Matthias Vojta

Format Sitasi

APA MLA BibTeX

Sachdev, S., Buragohain, C., Vojta, M. (2000). Quantum Impurity in a Nearly Critical Two Dimensional Antiferromagnet. https://arxiv.org/abs/cond-mat/0004156

Akses Cepat

Lihat di Sumber

Informasi Jurnal

Tahun Terbit: 2000
Bahasa: en
Sumber Database: arXiv
Akses: Open Access ✓