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Title: Enhancement and destruction of spin-Peierls physics in a one-dimensional quantum magnet under pressure

Abstract

The application of pressure reveals a rich phase diagram for the quantum S = 1/2 spin chain material TiOCl. Here, we performed x-ray diffraction on single-crystal samples in a diamond-anvil cell down to T = 4 K and pressures up to 14.5 GPa. Remarkably, the magnetic interaction scale increases dramatically with increasing pressure, as indicated by the high onset temperature of the spin-Peierls phase. The spin-Peierls phase was probed at ~ 6 GPa up to 215 K but possibly extends in temperature to above T = 300 K, indicating the possibility of a quantum singlet state at room temperature. Near the critical pressure for the transition to the more metallic phase, coexisting phases are exemplified by incommensurate order in two directions. Further comparisons are made with the phase diagrams of related spin-Peierls systems that display metallicity and superconductivity under pressure.

Authors:
 [1];  [1];  [2];  [3];  [3];  [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Applied Physics
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1423522
Alternate Identifier(s):
OSTI ID: 1421297; OSTI ID: 1426199
Grant/Contract Number:  
AC02-76SF00515; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Rotundu, Costel R., Wen, Jiajia, He, Wei, Choi, Yongseong, Haskel, Daniel, and Lee, Young S. Enhancement and destruction of spin-Peierls physics in a one-dimensional quantum magnet under pressure. United States: N. p., 2018. Web. doi:10.1103/physrevb.97.054415.
Rotundu, Costel R., Wen, Jiajia, He, Wei, Choi, Yongseong, Haskel, Daniel, & Lee, Young S. Enhancement and destruction of spin-Peierls physics in a one-dimensional quantum magnet under pressure. United States. doi:10.1103/physrevb.97.054415.
Rotundu, Costel R., Wen, Jiajia, He, Wei, Choi, Yongseong, Haskel, Daniel, and Lee, Young S. Thu . "Enhancement and destruction of spin-Peierls physics in a one-dimensional quantum magnet under pressure". United States. doi:10.1103/physrevb.97.054415. https://www.osti.gov/servlets/purl/1423522.
@article{osti_1423522,
title = {Enhancement and destruction of spin-Peierls physics in a one-dimensional quantum magnet under pressure},
author = {Rotundu, Costel R. and Wen, Jiajia and He, Wei and Choi, Yongseong and Haskel, Daniel and Lee, Young S.},
abstractNote = {The application of pressure reveals a rich phase diagram for the quantum S = 1/2 spin chain material TiOCl. Here, we performed x-ray diffraction on single-crystal samples in a diamond-anvil cell down to T = 4 K and pressures up to 14.5 GPa. Remarkably, the magnetic interaction scale increases dramatically with increasing pressure, as indicated by the high onset temperature of the spin-Peierls phase. The spin-Peierls phase was probed at ~ 6 GPa up to 215 K but possibly extends in temperature to above T = 300 K, indicating the possibility of a quantum singlet state at room temperature. Near the critical pressure for the transition to the more metallic phase, coexisting phases are exemplified by incommensurate order in two directions. Further comparisons are made with the phase diagrams of related spin-Peierls systems that display metallicity and superconductivity under pressure.},
doi = {10.1103/physrevb.97.054415},
journal = {Physical Review B},
number = 5,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Structure of TiOCl. (a) Crystal structure of TiOCl. (b) Representation of the commensurate dimer singlet state at T < Tc1 (the spin-Peierls state). (c) Scans along K through the commensurate (0,1.5,0) and (0,2.5,0) peak positions showing the peak intensity normalized to the nearest Bragg peak (0,2,0). For clarity,more » the superlattice peaks were magnified by a factor of 50 and 200, respectively.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.