skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-T{sub c} superconductor.

Abstract

A change in 'symmetry' is often observed when matter undergoes a phase transition--the symmetry is said to be spontaneously broken. The transition made by underdoped high-transition-temperature (high-{Tc}) superconductors is unusual, in that it is not a mean-field transition as seen in other superconductors. Rather, there is a region in the phase diagram above the superconducting transition temperature {Tc} (where phase coherence and superconductivity begin) but below a characteristic temperature T* where a 'pseudogap' appears in the spectrum of electronic excitations. It is therefore important to establish if T* is just a cross-over temperature arising from fluctuations in the order parameter that will establish superconductivity at Tc or if it marks a phase transition where symmetry is spontaneously broken. Here we report that, for a material in the pseudogap state, left-circularly polarized photons give a different photocurrent from right-circularly polarized photons. This shows that time-reversal symmetry is spontaneously broken below T*, which therefore corresponds to a phase transition.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); FOR
OSTI Identifier:
949632
Report Number(s):
ANL/MSD/JA-42729
TRN: US1003601
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Nature
Additional Journal Information:
Journal Volume: 416; Journal Issue: 6881 ; Apr. 11, 2002
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FLUCTUATIONS; ORDER PARAMETERS; PHASE DIAGRAMS; PHOTOCURRENTS; PHOTONS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; SYMMETRY; TRANSITION TEMPERATURE

Citation Formats

Kaminski, A, Rosenkranz, S, Fretwell, H M, Campuzano, J C, Li, Z, Raffy, H, Cullen, W G, You, H, Olson, C G, Varma, C M, Hochst, H, Materials Science Division, Univ. of Illinois-Chicago, Univ. of Wales Swansea, Universite Paris-Sud, Univ. of Iowa, Lucent Tech., and Synchrotron Radiation Center. Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-T{sub c} superconductor.. United States: N. p., 2002. Web. doi:10.1038/416610a.
Kaminski, A, Rosenkranz, S, Fretwell, H M, Campuzano, J C, Li, Z, Raffy, H, Cullen, W G, You, H, Olson, C G, Varma, C M, Hochst, H, Materials Science Division, Univ. of Illinois-Chicago, Univ. of Wales Swansea, Universite Paris-Sud, Univ. of Iowa, Lucent Tech., & Synchrotron Radiation Center. Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-T{sub c} superconductor.. United States. https://doi.org/10.1038/416610a
Kaminski, A, Rosenkranz, S, Fretwell, H M, Campuzano, J C, Li, Z, Raffy, H, Cullen, W G, You, H, Olson, C G, Varma, C M, Hochst, H, Materials Science Division, Univ. of Illinois-Chicago, Univ. of Wales Swansea, Universite Paris-Sud, Univ. of Iowa, Lucent Tech., and Synchrotron Radiation Center. Thu . "Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-T{sub c} superconductor.". United States. https://doi.org/10.1038/416610a.
@article{osti_949632,
title = {Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-T{sub c} superconductor.},
author = {Kaminski, A and Rosenkranz, S and Fretwell, H M and Campuzano, J C and Li, Z and Raffy, H and Cullen, W G and You, H and Olson, C G and Varma, C M and Hochst, H and Materials Science Division and Univ. of Illinois-Chicago and Univ. of Wales Swansea and Universite Paris-Sud and Univ. of Iowa and Lucent Tech. and Synchrotron Radiation Center},
abstractNote = {A change in 'symmetry' is often observed when matter undergoes a phase transition--the symmetry is said to be spontaneously broken. The transition made by underdoped high-transition-temperature (high-{Tc}) superconductors is unusual, in that it is not a mean-field transition as seen in other superconductors. Rather, there is a region in the phase diagram above the superconducting transition temperature {Tc} (where phase coherence and superconductivity begin) but below a characteristic temperature T* where a 'pseudogap' appears in the spectrum of electronic excitations. It is therefore important to establish if T* is just a cross-over temperature arising from fluctuations in the order parameter that will establish superconductivity at Tc or if it marks a phase transition where symmetry is spontaneously broken. Here we report that, for a material in the pseudogap state, left-circularly polarized photons give a different photocurrent from right-circularly polarized photons. This shows that time-reversal symmetry is spontaneously broken below T*, which therefore corresponds to a phase transition.},
doi = {10.1038/416610a},
url = {https://www.osti.gov/biblio/949632}, journal = {Nature},
number = 6881 ; Apr. 11, 2002,
volume = 416,
place = {United States},
year = {2002},
month = {4}
}